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37th International Cosmic Ray Conference, ICRC 2021

作者： Adriani, O. Akaike, Y. Asano, K. Asaoka, Y. Berti, E. Bigongiari, G. Binns, W.R. Bongi, M. Brogi, P. Bruno, A. Buckley, J.H. Cannady, Nicholas Castellini, G. Checchia, C. Cherry, M.L. Collazuol, G. Ebisawa, K. Ficklin, A.W. Fuke, H. Gonzi, S. Guzik, T.G. Hams, T. Hibino, K. Ichimura, M. Ioka, K. Ishizaki, W. Israel, M.H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kobayashi, K. Kohri, K. Krawczynski, H.S. Krizmanic, J.F. Maestro, P. Marrocchesi, P.S. Messineo, A.M. Mitchell, J.W. Miyake, S. Moiseev, A.A. Mori, M. Mori, N. Motz, H.M. Munakata, K. Nakahira, S. Nishimura, J. de Nolfo, G.A. Okuno, S. Ormes, J.F. Ospina, N. Ozawa, S. Pacini, L. Papini, P. Rauch, B.F. Ricciarini, S.B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J.P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W.V. Department of Physics University of Florence Via Sansone 1 Sesto Fiorentino 50019 Italy INFN Sezione di Florence Via Sansone 1 Sesto Fiorentino 50019 Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Ibaraki Tsukuba305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Chiba Kashiwa277-8582 Japan Department of Physical Sciences Earth and Environment University of Siena via Roma 56 Siena53100 Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 Pisa56127 Italy Department of Physics McDonnell Center for the Space Sciences Washington University One Brookings Drive St. LouisMO63130-4899 United States Heliospheric Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Department of Physics Catholic University of America WashingtonDC20064 United States Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Center for Research and Exploration in Space Sciences and Technology NASA/GSFC GreenbeltMD20771 United States Via Madonna del Piano 10 Sesto Fiorentino 50019 Italy Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton RougeLA70803 United States Department of Physics and Astronomy University of Padova Via Marzolo 8 Padova35131 Italy INFN Sezione di Padova Via Marzolo 8 Padova35131 Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Kanagawa Sagamihara252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Kanagawa Yokohama221-8686 Japan Faculty of Science and Technology Graduate School of Science and Technology Hirosaki Universi

The CALorimetric Electron Telescope (CALET) was launched in August 2015 and installed on the International Space Station (ISS) Japanese Experiment Module Exposed Facility. Alongside the primary science targets of GeV-TeV energy cosmic-ray electrons and cosmic-ray hadrons up to PeV energies, CALET is sensitive to gamma rays from 1 GeV up to 10 TeV, limited by statistics. Access to energies below 10 GeV is enabled by a dedicated low-energy gamma (LE-γ) trigger which is active only at low geomagnetic latitudes. In this work we review the analysis of gamma-ray events collected with this trigger including the mitigation of a secondary photon background from cosmic-ray interactions with ISS structures in the CALET field-of-view, the observation of persistent galactic and extragalactic sources, and the detection of emission from the quiescent Sun. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Cosmology

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Morphological and electrical studies of Hf0.5Zr0.5O2 electroceramics

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AIP Conference Proceedings 2023年第1期2800卷

作者： Urvashi Sharma Gulshan Kumar Sachin Mishra Ashok Kumar Reji Thomas School of Electronics and Electrical Engineering Lovely Professional University Jalandhar-Delhi G.T. Road Punjab-144411 India Division of Research and Development Lovely Professional University Jalandhar-Delhi G.T. Road Punjab-144411 India School of Computer Science and Engineering Lovely Professional University Jalandhar-Delhi G.T. Road Punjab-144411 India CSIR-National Physical Laboratory Dr. Krishnan Marg New Delhi 110012 India School of Chemical Engineering and Physical Sciences Lovely Professional University Jalandhar-Delhi G.T. Road Punjab-144411 India

The conventional solid-state reaction route has been utilized to synthesize Hf0.5Zr0.5O2 ceramics. The surface morphology and structural properties are studied using scanning electron microscopy and X-ray diffraction patterns, respectively. The X-ray diffraction patterns show sharp and intense peaks explaining better crystallinity of compositional ceramic. The peak splitting around 31.7° confirms the tetragonal phase. The electrical measurements have been carried out on metal-ferroelectric-metal (MFM) capacitors. The calculated dielectric constant is around 26 at 1 MHz. The hopping of electrons over the trap centers leads to the ac conduction at a low field. Jonscher’s power model justified the ac conductivity curve, and attained data are fitted accordingly. The polarization and coercive field decrease initially with the rise of measurement frequency and later increased with frequency. The ferroelectric hysteresis loop generally observed in the thin films of Hf0.5Zr0.5O2 has not seen the polarization-electric field curve of bulk Hf0.5Zr0.5O2.

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Metropolitan quantum key distribution using a GaN-based room-temperature telecommunication single-photon source

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physical Review Applied 2025年第5期23卷 054022-054022页

作者： Haoran Zhang Xingjian Zhang John Eng Max Meunier Yuzhe Yang Alexander Ling Jesús Zúñiga-Pérez Weibo Gao School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Singapore Centre for Quantum Technologies National University of Singapore Singapore Singapore Department of Physics National University of Singapore Singapore Singapore MajuLab International Research Laboratory IRL 3654 CNRS Université Côte d’Azur Sorbonne Université National University of Singapore Nanyang Technological University Singapore Singapore Quantum Science and Engineering Centre (QSec) Nanyang Technological University Singapore Singapore

Single-photon sources (SPSs) hold the potential to enhance the performance of quantum key distribution (QKD). QKD systems using SPS often require cryogenic cooling, while recent QKD attempts using SPS operating at room temperature have failed to achieve long-distance transmission due to the SPS not operating at telecommunication wavelength. In this work, we have successfully demonstrated QKD using a room-temperature SPS at telecommunication wavelength. The SPS used in this work is based on point defects hosted by gallium nitride (GaN) thin films grown on sapphire substrates. We employed a time-bin and phase-encoding scheme to perform the BB84 and reference-frame-independent QKD protocols over a 33-km fiber spool, achieving a secure key rate of 7.58×10−7 per pulse. Moreover, we also implemented a metropolitan QKD experiment over a 30-km deployed fiber, achieving a secure key rate of 6.06×10−8 per pulse. These results broaden the prospects for future use of SPS in commercial QKD applications.

关键词： Quantum communication

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High-Q unidirectional polarization singularities

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physical Review Applied 2025年第5期23卷 054020-054020页

作者： Chuanlin Li Wenhao Wang Jianfeng Chen Mengqi Liu Aobo Ren Cheng-Wei Qiu Hongxing Xu Zhiming Wang Jiang Wu Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore 637371 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Institute of Engineering Thermophysics School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Physics and Technology Center for Nanoscience and Nanotechnology and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education Wuhan University Wuhan 430072 China

Unidirectional guided resonances (UGRs), which are eigenstates that radiate exclusively in a single channel, are promising for advancing diverse photonic devices. However, existing approaches face an inherent trade-off between achieving high-Q factors and maximizing the radiation-asymmetry ratios. To address this challenge, we propose a scheme that exploits both out-of-plane and in-plane couplings to generate bound states in the continuum with precise radial and rotational control in momentum space. This approach effectively decouples the Q factors of UGRs from their radiation-asymmetry ratios. As a result, we achieve UGRs with Q factors exceeding 104, which is 1–2 orders of magnitude higher than traditional UGRs. Furthermore, we demonstrate the ability to reverse the emission direction of these UGRs, leading to a broad range of radiation-asymmetry ratios from −53 to 55 dB. We further validate the practical realization of high-Q UGRs using a silicon-on-silica system. Our findings provide a versatile method for generating high-Q UGRs, offering alternative pathways for innovations in nonlinear optics, light-matter interactions, and advanced optoelectronic applications.

关键词： Nonlinear optics

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Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

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physical Review Letters 2022年第16期129卷 166401-166401页

作者： Jia-Xin Yin Yu-Xiao Jiang Xiaokun Teng Md. Shafayat Hossain Sougata Mardanya Tay-Rong Chang Zijin Ye Gang Xu M. Michael Denner Titus Neupert Benjamin Lienhard Han-Bin Deng Chandan Setty Qimiao Si Guoqing Chang Zurab Guguchia Bin Gao Nana Shumiya Qi Zhang Tyler A. Cochran Daniel Multer Ming Yi Pengcheng Dai M. Zahid Hasan Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Physics and Astronomy Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Department of Physics National Cheng Kung University Tainan 70101 Taiwan Wuhan National High Magnetic Field Center & School of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics University of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Laboratory for Quantum Emergence department of physics Southern University of Science and Technology Shenzhen Guangdong 518055 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Lawrence Berkeley National Laboratory Berkeley California 94720 USA Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Quantum Science Center Oak Ridge Tennessee 37830 USA

Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge density wave, and superconductivity. Existing scanning microscopy studies of the kagome charge order have been limited to nonkagome surface layers. Here, we tunnel into the kagome lattice of FeGe to uncover features of the charge order. Our spectroscopic imaging identifies a 2×2 charge order in the magnetic kagome lattice, resembling that discovered in kagome superconductors. Spin mapping across steps of unit cell height demonstrates the existence of spin-polarized electrons with an antiferromagnetic stacking order. We further uncover the correlation between antiferromagnetism and charge order anisotropy, highlighting the unusual magnetic coupling of the charge order. Finally, we detect a pronounced edge state within the charge order energy gap, which is robust against the irregular shape fluctuations of the kagome lattice edges. We discuss our results with the theoretically considered topological features of the kagome charge order including unconventional magnetism and bulk-boundary correspondence.

关键词： Charge density waves Density of states Edge states Electronic structure Topological materials

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Interactive Protocols for Classically-Verifiable Quantum Advantage

arXiv

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arXiv 2021年

作者： Zhu, Daiwei Kahanamoku-Meyer, Gregory D. Lewis, Laura Noel, Crystal Katz, Or Harraz, Bahaa Wang, Qingfeng Risinger, Andrew Feng, Lei Biswas, Debopriyo Egan, Laird Gheorghiu, Alexandru Nam, Yunseong Vidick, Thomas Vazirani, Umesh Yao, Norman Y. Cetina, Marko Monroe, Christopher Joint Quantum Institute Departments of Physics and Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Joint Center for Quantum Information and Computer Science NIST University of Maryland College ParkMD20742 United States Department of Physics University of California BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Computing and Mathematical Sciences California Institute of Technology CA91125 United States Division of Physics Mathematics and Astronomy California Institute of Technology CA91125-0001 United States Duke Quantum Center Department of Physics Duke University DurhamNC27708 United States Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States IonQ Inc. College ParkMD20740 United States Institute for Theoretical Studies ETH Zürich CH 8001 Switzerland Chemical Physics Program Institute for Physical Science and Technology University of Maryland College ParkMD20742 United States Departments of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States

Interaction is a powerful resource for quantum computation. It can be utilized in applications ranging from the verification of quantum algorithms all the way to verifying quantum mechanics itself. Here, we present the first implementation of interactive protocols for proofs of quantumness — which when suitably scaled promise the efficient verification of quantum computational advantage. The key feature that distinguishes these protocols from existing demonstrations of quantum advantage is that the classical verification is efficient and scales polynomially rather than exponentially with the number of qubits. The experimental implementation of such interactive protocols requires the ability to independently measure subsets of qubits in the middle of a quantum circuit and to continue coherent evolution afterwards. This is achieved by spatially isolating target qubits via shuttling, and opens the door to a range of quantum interactive protocols as well as new information processing architectures. Copyright © 2021, The Authors. All rights reserved.

关键词： Qubits

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Magnetically Tuned Continuous Transition from Weak to Strong Coupling in Terahertz Magnon Polaritons

arXiv

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arXiv 2022年

作者： Baydin, Andrey Hayashida, Kenji Makihara, Takuma Tay, Fuyang Ma, Xiaoxuan Ren, Wei Ma, Guohong Noe, G. Timothy Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Cao, Shixun Bamba, Motoaki Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States The Smalley-Curl Institute Rice University HoustonTX77005 United States Division of Applied Physics Graduate School of Engineering Hokkaido University Hokkaido Sapporo060-8628 Japan Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics International Center of Quantum and Molecular Structures Materials Genome Institute Shanghai University Shanghai200444 China Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan The Hakubi Center for Advanced Research Kyoto University Kyoto606-8502 Japan Department of Physics I Kyoto University Kyoto606-8502 Japan PRESTO Japan Science and Technology Agency Kawaguchi332-0012 Japan Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where the coupling rate continuously increases with an externally applied magnetic field while the dissipation rate remains constant, allowing us to monitor a weak-to-strong coupling transition as a function of magnetic field. We observed a Rabi splitting of a terahertz magnon mode in yttrium orthoferrite above a threshold magnetic field of ∼14 T. Based on a microscopic theoretical model, we show that with increasing magnetic field the magnons transition into magnon polaritons through an exceptional point, which will open up new opportunities for in situ control of non-Hermitian systems. Copyright © 2022, The Authors. All rights reserved.

关键词： Polariton

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Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium

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physical Review Applied 2022年第2期18卷 024075-024075页

作者： Jonathan Gibbons Takaaki Dohi Vivek P. Amin Fei Xue Haowen Ren Jun-Wen Xu Hanu Arava Soho Shim Hilal Saglam Yuzi Liu John E. Pearson Nadya Mason Amanda K. Petford-Long Paul M. Haney Mark D. Stiles Eric E. Fullerton Andrew D. Kent Shunsuke Fukami Axel Hoffmann Department of Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Physics University of California San Diego La Jolla California 92093 USA Laboratory for Nanoelectronics and Spintronics Research Institute of Electrical Communications Tohoku University Sendai 980-8577 Japan Department of Physics Indiana University – Purdue University Indianapolis Indianapolis Indiana 46202 USA Associate Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Institute for Research in Electronics and Applied Physics & Maryland Nanocenter University of Maryland College Park Maryland 20742 USA Department of Physics University of Alabama at Birmingham Birmingham Alabama 35294 USA Center for Quantum Phenomena New York University New York New York 10003 USA Center for Memory and Recording Research University of California San Diego La Jolla California 92093 USA Northwestern-Argonne Institute of Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois 60439 USA Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA

Spin torque is a promising tool for driving magnetization dynamics for computing technologies. These torques can be easily produced by spin-orbit effects, but for most conventional spin source materials, a high degree of crystal symmetry limits the geometry of the spin torques produced. Magnetic ordering is one way to reduce the symmetry of a material and allow exotic torques, and antiferromagnets are particularly promising because they are robust against external fields. We present spin torque ferromagnetic resonance (ST-FMR) measurements and second harmonic Hall measurements characterizing the spin torques in antiferromagnetic iron rhodium alloy. We report extremely large, strongly temperature-dependent exotic spin torques with a geometry apparently defined by the magnetic ordering direction. We find the spin torque efficiency of iron rhodium to be (207 ± 94)% at 170 K and (88 ± 32)% at room temperature. We support our conclusions with theoretical calculations showing how the antiferromagnetic ordering in iron rhodium gives rise to such exotic torques.

关键词： Spin Hall effect Spin current Spin torque Antiferromagnets Ferromagnetic resonance Hall bar Resistivity measurements

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Plasma proteomic analysis of intermuscular fat links muscle integrity with processing speed in older adults

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Alzheimer's and Dementia 2025年第5期21卷 e70261页

作者： Tanaka, Toshiko Rosano, Caterina Huang, Xiaoning Tian, Qu Landman, Bennett A. Moore, Ann Z. Miljkovic, Iva Perry, Andrew Khan, Sadiya Kalhan, Ravi Carr, John Jeffrey Terry, James G. Yaffe, Kristine Walker, Keenan A. Candia, Julián Ferrucci, Luigi Longitudinal Studies Section Translational Gerontology Branch NIH NIA Baltimore MD United States Department of Epidemiology School of Public Health University of Pittsburgh Pittsburgh PA United States Division of Cardiology Department of Medicine Feinberg School of Medicine Northwestern University Chicago IL United States Department of Computer Science Vanderbilt University Nashville TN United States Vanderbilt Translational and Clinical Cardiovascular Research Center Vanderbilt University School of Medicine Nashville TN United States Division of Pulmonary and Critical Care Medicine Department of Medicine Northwestern University Feinberg School of Medicine Chicago IL United States Department of Electrical and Computer Engineering Vanderbilt University School of Medicine Nashville TN United States UCSF Weill Institute for Neurosciences University of California–San Francisco San Francisco CA United States Laboratory of Behavioral Neuroscience National Institute on Aging Intramural Research Program Baltimore MD United States

INTRODUCTION: More intermuscular fat (IMF) has been associated with lower cognitive performance through mechanisms that are not fully elucidated. METHODS: The associations of 7628 plasma proteins with IMF were assessed in the Baltimore Longitudinal Study on Aging (n = 941, mean age = 66.7 ± 15.2) and validated in the Coronary Artery Risk Development in Young Adults Study (n = 2451, mean age = 50.2 ± 3.6). Processing speed was assessed by Digit Symbol Substitution Test (DSST). Associations between the main exposures, outcome, and mediators were evaluated using linear regression, and mediating effects were assessed by causal mediation analysis. RESULTS: There were 722 plasma proteins associated with IMF in both the discovery and replication cohorts (false discovery rate [FDR] adjusted p ≤ 0.05). Of these, 26 mediated the relationship between IMF and DSST, with effects ranging from 2.8% to 20.9% (p ≤ 0.05). These proteins represented synaptic function and organization, and growth factor binding (FDR adjusted p ≤ 0.05). DISCUSSION: Reducing IMF may improve processing speed through effects on growth factor and synaptic activity. Highlights: Higher intermuscular fat is associated with lower processing speed, consistently across populations that represent different demographic characteristics. There is a robust plasma proteomic profile of intermuscular fat that is assessed in the abdominal and thigh skeletal muscle. The proteins associated with intermuscular fat reflect signals that are reflective of synaptic function and organization, as well as other molecular pathways such as growth factor binding. Circulating proteins partially explain the association between higher intermuscular fat and lower processing speed, suggesting that higher intermuscular fat effects processing speed through pathways including synaptic functions and growth factor binding. © 2025 The Author(s). Alzheimer's & Dementia published by Wiley Periodicals LLC on behalf of Alzheimer's Association. This

关键词： aging epidemiology intermuscular fat processing speed proteomics

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Phonon-Mediated Attractive Interactions between Excitons in Lead-Halide-Perovskites

arXiv

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arXiv 2022年

作者： Yazdani, Nuri Bodnarchuk, Maryna I. Bertolotti, Federica Masciocchi, Norberto Fureraj, Ina Guzelturk, Burak Cotts, Benjamin L. Zajac, Marc Rainò, Gabriele Jansen, Maximilian Boehme, Simon C. Yarema, Maksym Lin, Ming-Fu Kozina, Michael Reid, Alexander Shen, Xiaozhe Weathersby, Stephen Wang, Xijie Vauthey, Eric Guagliardi, Antonietta Kovalenko, Maksym V. Wood, Vanessa Lindenberg, Aaron Department of Materials Science and Engineering Stanford University StanfordCA United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA United States Department of Information Technology and Electrical Engineering ETH Zürich Zürich Switzerland Department of Chemistry and Applied Biosciences ETH Zürich ZürichCH-8093 Switzerland Empa- Swiss Federal Laboratories for Materials Science and Technology Dübendorf Dübendorf CH-8600 Switzerland Dipartimento di Scienza e Alta Tecnologia & To.Sca.Lab Università dell’Insubria Como22100 Italy Department of Physical Chemistry University of Geneva 30 Quai Ernest-Ansermet Geneva 4CH-1211 Switzerland X-ray Science Division Argonne National Laboratory LemontIL60439 United States Department of Chemistry and Biochemistry Middlebury College MiddleburyVT United States Chemistry and Materials Design Group Institute for Electronics Department of Information Technology and Electrical Engineering ETH Zurich Gloriastrasse 35 Zurich8092 Switzerland Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA United States Istituto di Cristallografia & To.Sca.Lab Consiglio Nazionale delle Ricerche Como22100 Italy The PULSE Institute for Ultrafast Energy Science SLAC National Accelerator Laboratory Menlo ParkCA United States Department of Photon Science Stanford University SLAC National Accelerator Laboratory Menlo ParkCA United States

Understanding the origin of electron-phonon coupling in lead-halide perovskites (LHP) is key to interpreting and leveraging their optical and electronic properties. Here we perform femtosecond-resolved, optical-pump, electron-diffraction-probe measurements to quantify the lattice reorganization occurring as a result of photoexcitation in LHP nanocrystals. Photoexcitation is found to drive a reduction in lead-halide octahedra tilts and distortions in the lattice, a result of deformation potential coupling to low energy optical phonons. Our results indicate particularly strong coupling in FAPbBr3, and far weaker coupling in CsPbBr3, highlighting differences in the dominant machanisms governing electron-phonon coupling in LHPs. We attribute the enhanced coupling in FAPbBr3 to its disordered crystal structure, which persists down to cryogenic temperatures. We find the reorganizations induced by each exciton in a multiexcitonic state constructively interfere, giving rise to a coupling strength which scales quadratically with the exciton number. This superlinear scaling induces phonon-mediated attractive interactions between excitations in LHPs. © 2022, CC BY.

关键词： Perovskite

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