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Probing two-path electron quantum interference in strong-field ionization with time-correlation filtering

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Physical Review A 2022年第3期106卷 033118-033118页

作者： Nicholas Werby Andrew S. Maxwell Ruaridh Forbes Carla Figueira de Morisson Faria Philip H. Bucksbaum Stanford PULSE Institute SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Physics Stanford University Stanford California 94305 USA Department of Physics and Astronomy Aarhus University DK-8000 Aarhus C Denmark Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology 08860 Castelldefels (Barcelona) Spain Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo Park California 94025 USA Department of Applied Physics Stanford University Stanford California 94305 USA

Attosecond dynamics in strong-field tunnel ionization are encoded in intricate holographic patterns in the photoelectron momentum distributions. These patterns show the interference between two or more superposed quantum electron trajectories, which are defined by their ionization times and subsequent evolution in the laser field. We determine the ionization time separation between interfering pairs of electron orbits by performing a differential Fourier analysis on the measured momentum spectrum. We identify electron holograms formed by trajectory pairs whose ionization times are separated by less than a single quarter cycle, between a quarter cycle and half cycle, between a half cycle and three fourths of a cycle, and a full cycle apart. We compare our experimental results to the predictions of the Coulomb quantum orbit strong-field approximation (CQSFA) with significant success. We also time-filter the CQSFA trajectory calculations to demonstrate the validity of the technique on spectra with known time correlations. As a general analysis technique, the filter can be applied to all energy- and angularly resolved data sets to recover time correlations between interfering electron pathways, providing an important tool to analyze any strong-field ionization spectra. Moreover, it is independent of theory and can be applied directly to experiments, without the need of a direct comparison with orbit-based theoretical methods.

关键词： Multiphoton or tunneling ionization & excitation Single- and few-photon ionization & excitation Ultrafast phenomena

Genetically encoded X-ray cellular imaging for nanoscale protein localization

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National science Review 2020年第7期7卷 1218-1227页

作者： Huating Kong Jichao Zhang Jiang Li Jian Wang Hyun-Joon Shin Renzhong Tai Qinglong Yan Kai Xia Jun Hu Lihua Wang Ying Zhu Chunhai Fan Bioimaging Center Shanghai Synchrotron Radiation FacilityZhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Division of Physical Biology CAS Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Canadian Light Source Inc. University of Saskatchewan Pohang Accelerator Laboratory POSTECH School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and Shanghai Key Laboratory for Nucleic Acids Chemistry and NanomedicineInstitute of Molecular Medicine Renji Hospital School of Medicine Shanghai Jiao Tong University

Spatial resolution defines the physical limit of microscopes for probing biomolecular localization and interactions in cells. Whereas synchrotron-based X-ray microscopy(XRM) represents a unique approach for imaging a whole cell with nanoscale resolution due to its intrinsic nanoscale resolution and great penetration ability, existing approaches to label biomolecules rely on the use of exogenous tags that are multi-step and error-prone. Here, we repurpose engineered peroxidases as genetically encoded X-ray-sensitive tags(GXET) for site-specific labeling of protein-of-interest in mammalian cells. We find that 3,3-diaminobenzidine(DAB) polymers that are in-situ catalytically formed by fusion-expressed peroxidases are visible under XRM. Using this new tag, we imaged the protein location associated with the alteration of a DNA-methylation pathway with an ultra-high resolution of 30 nanometers. Importantly, the excellent energy resolution of XRM enables multicolor imaging using different peroxidase tags. The development of GXET enlightens the way to nanoscopic imaging for biological studies.

关键词： synchrotron-based X-ray microscopy cellular imaging nanoscale protein localization genetically encoded X-ray tags 3,3-diaminobenzidine polymers

Controlling structure and interfacial interaction of monolayer TaSe2 on bilayer graphene

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arXiv 2024年

作者： Lee, Hyobeom Im, Hayoon Choi, Byoung Ki Park, Kyoungree Chen, Yi Ruan, Wei Zhong, Yong Lee, Ji-Eun Ryu, Hyejin Crommie, Michael F. Shen, Zhi-Xun Hwang, Choongyu Mo, Sung-Kwan Hwang, Jinwoong Department of Physics Institute of Quantum Convergence Technology Kangwon National University Chuncheon Korea Republic of Department of Physics Pusan National University Busan Korea Republic of Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA United States Department of Physics University of California BerkeleyCA United States International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials Peking University Beijing100871 China State Key Laboratory of Surface Physics New Cornerstone Science Laboratory Department of Physics Fudan University Shanghai China Geballe Laboratory for Advanced Materials Department of Physics and Applied Physics Stanford University StanfordCA United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA United States Max Planck POSTECH Center for Complex Phase Materials Pohang University of Science and Technology Pohang Korea Republic of Center for Spintronics Korea Institute of Science and Technology Seoul Korea Republic of Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA United States

Tunability of interfacial effects between two-dimensional (2D) crystals is crucial not only for understanding the intrinsic properties of each system, but also for designing electronic devices based on ultra-thin heterostructures. A prerequisite of such heterostructure engineering is the availability of 2D crystals with different degrees of interfacial interactions. In this work, we report a controlled epitaxial growth of monolayer TaSe2 with different structural phases, 1H and 1T, on a bilayer graphene (BLG) substrate using molecular beam epitaxy, and its impact on the electronic properties of the heterostructures using angle-resolved photoemission spectroscopy. 1H-TaSe2 exhibits significant charge transfer and band hybridization at the interface, whereas 1T-TaSe2 shows weak interactions with the substrate. The distinct interfacial interactions are attributed to the dual effects from the differences of the work functions as well as the relative interlayer distance between TaSe2 films and BLG substrate. The method demonstrated here provides a viable route towards interface engineering in a variety of transition-metal dichalcogenides that can be applied to future nano-devices with designed electronic properties. © 2024, CC BY.

关键词： Molecular beam epitaxy

Coupling between electrons and charge density wave fluctuation and its possible role in superconductivity

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arXiv 2024年

作者： Lee, Yeonghoon Sur, Yeahan Kim, Sunghun Cha, Jaehun Hyun, Jounghoon Lim, Chan-Young Hashimoto, Makoto Lu, Donghui Kim, Younsik Huh, Soonsang Kim, Changyoung Ideta, Shinichiro Tanaka, Kiyohisa Kim, Kee Hoon Kim, Yeongkwan Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Quantum Technology Institute Korea Research Institute of Standards and Science Daejeon34113 Korea Republic of Center for Novel States of Complex Materials Research Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Physics Ajou University Suwon16499 Korea Republic of Stanford Synchrotron Radiation Light Source Stanford Linear Accelerator Center Menlo ParkCA94025 United States Center for Correlated Electron Systems Institute for Basic Science Seoul08826 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Ultra Violet Synchrotron Orbital Radiation Institute for Molecular Science Okazaki Myodaiji 444-8585 Japan Hiroshima Synchrotron Radiation Center Hiroshima University Higashi-Hiroshima739-0046 Japan Institute of Applied Physics Seoul National University Seoul08826 Korea Republic of

In most of charge density wave (CDW) systems of different material classes, ranging from traditional correlated systems in low-dimension to recent topological systems with Kagome lattice, superconductivity emerges when the system is driven toward the quantum critical point (QCP) of CDW via external parameters of doping and pressure. Despite this rather universal trend, the essential hinge between CDW and superconductivity has not been established yet. Here, the evidence of coupling between electron and CDW fluctuation is reported, based on a temperature- and intercalation-dependent kink in the angle-resolved photoemission spectra of 2H-PdxTaSe2. Kinks are observed only when the system is in the CDW phase, regardless of whether a long- or short-range order is established. Notably, the coupling strength is enhanced upon long-range CDW suppression, albeit the coupling energy scale is reduced. Interestingly, estimation of the superconducting critical temperature by incorporating the observed coupling characteristics into McMillan’s equation yields result closely resembling the known values of the superconducting dome. Our results thus highlight a compelling possibility that this new coupling mediates Cooper pairs, which provides new insights on the competing relationship not only for CDW, but also for other competing orders. © 2024, CC BY.

关键词： Charge density waves

Determination of nonthermal bonding origin of a novel photoexcited lattice instability in SnSe

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arXiv 2023年

作者： Huang, Yijing Teitelbaum, Samuel Yang, Shan De la Peña, Gilberto Sato, Takahiro Chollet, Matthieu Zhu, Diling Niedziela, Jennifer L. Bansal, Dipanshu May, Andrew F. Lindenberg, Aaron M. Delaire, Olivier Trigo, Mariano Reis, David A. Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Applied Physics Stanford University StanfordCA94305 United States Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Physics Arizona State University TempeAZ85287 United States Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Mechanical Engineering Indian Institute of Technology Bombay MH Mumbai400076 India Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Department of Physics Duke University DurhamNC27708 United States Department of Chemistry Duke University DurhamNC27708 United States Department of Photon Science Stanford University StanfordCA94305 United States

Interatomic forces that bind materials are largely determined by an often complex interplay between the electronic band-structure and the atomic arrangements to form its equilibrium structure and dynamics. As these forces also determine the phonon dispersion, lattice dynamics measurements are often crucial tools for understanding how materials transform between different structures. This is the case for the mono-chalcogenides which feature a number of lattice instabilities associated with their network of resonant bonds and a large tunability in their functional properties. SnSe hosts a novel lattice instability upon above-bandgap photoexcitation that is distinct from the distortions associated with its high temperature phase transition, demonstrating that photoexcitation can alter the interatomic forces significantly different than thermal excitation. Here we report decisive time-resolved X-ray scattering-based measurements of the nonequlibrium lattice dynamics in SnSe. By fitting interatomic force models to the excited-state dispersion, we determine this instability as being primarily due to changes in the fourth-nearest neighbor bonds that connect bilayers, with relatively little change to the intralayer resonant bonds. In addition to providing critical insight into the nonthermal bonding origin of the instability in SnSe, such measurements will be crucial for understanding and controlling materials properties under non-equilibrium conditions. © 2023, CC BY-NC-ND.

关键词： Selenium compounds

Characterization of photoinduced normal state through charge density wave in superconducting YBa2Cu3O6.67

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arXiv 2022年

作者： Jang, Hoyoung Song, S. Kihara, T. Liu, Y. Lee, S.-J. Park, S.-Y. Kim, M. Kim, H.-D. Coslovich, G. Nakata, S. Kubota, Y. Inoue, I. Tamasaku, K. Yabashi, M. Lee, H. Song, C. Nojiri, H. Keimer, B. Kao, C.-C. Lee, J.-S. PAL-XFEL Pohang Accelerator Laboratory Gyeongbuk Pohang37673 Korea Republic of Photon Science Center Pohang University of Science and Technology Gyeongbuk Pohang37673 Korea Republic of Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Institute for Materials Research Tohoku University Katahira 2-1-1 Sendai980-8577 Japan Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Max Planck Institute for Solid State Research Heisenbergstr. 1 Stuttgart70569 Germany RIKEN SPring-8 Center Sayo Hyogo 679-5148 Japan Japan Synchrotron Radiation Research Institute Sayo Hyogo 679-5198 Japan Department of Physics Pohang University of Science and Technology Gyeongbuk Pohang37673 Korea Republic of SLAC National Accelerator Laboratory Menlo ParkCA94025 United States

The normal state of high-Tc cuprates has been considered one of the essential topics in high-temperature superconductivity research. However, compared to the high magnetic-fields study of it, understanding a photoinduced normal state remains elusive. Here, we explore a photoinduced normal state of YBa2Cu3O6.67 (YBCO) through a charge density wave (CDW) with time-resolved resonant soft x-ray scattering, as well as a high-magnetic field x-ray scattering. In the non-equilibrium state in which people predict a quenched superconducting state based on the previous optical spectroscopies, we experimentally observed a similar analogy to the competition between superconductivity and CDW shown in the equilibrium state. We further observe that the broken pairing states in the superconducting CuO2 plane via the optical pump lead to nucleation of three-dimensional CDW precursor correlation, revealing that the photoinduced CDW is similar to phenomena shown under magnetic fields. Ultimately, these findings provide a critical clue that the characteristics of the photoinduced normal state show a solid resemblance to those under magnetic fields in equilibrium conditions. Copyright © 2022, The Authors. All rights reserved.

关键词： Optical correlation

Ultrafast X-ray imaging of the light-induced phase transition in VO2

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arXiv 2022年

作者： Johnson, Allan S. Perez-Salinas, Daniel Siddiqui, Khalid M. Kim, Sungwon Choi, Sungwook Volckaert, Klara Majchrzak, Paulina E. Ulstrup, Søren Agarwal, Naman Hallman, Kent Haglund, Richard F. Günther, Christian M. Pfau, Bastian Eisebitt, Stefan Backes, Dirk Maccherozzi, Francesco Fitzpatrick, Ann Dhesi, Sarnjeet S. Gargiani, Pierluigi Valvidares, Manuel Artrith, Nongnuch de Groot, Frank Choi, Hyeongi Jang, Dogeun Katoch, Abhishek Kwon, Soonnam Park, Sang Han Kim, Hyunjung Wall, Simon E. ICFO-Institut de Ciències Fotòniques The Barcelona Institute of Science and Technology Barcelona Spain Department of Physics and Astronomy Aarhus University Aarhus Denmark Department of Physics Sogang University Seoul Korea Republic of Department of Physics and Astronomy Vanderbilt University NashvilleTN United States Technische Universität Berlin Berlin Germany Max-Born-Institut Berlin Germany Institut für Optik und Atomare Physik Technische Universität Berlin Berlin Germany Diamond Light Source Didcot United Kingdom ALBA Synchrotron Light Source Barcelona Spain Materials Chemistry and Catalysis Utrecht University Utrecht Netherlands Pohang Accelerator Laboratory Pohang Korea Republic of

Using light to control transient phases in quantum materials is an emerging route to engineer new properties and functionality, with both thermal and non-thermal phases observed out of equilibrium. Transient phases are expected to be heterogeneous, either through photo-generated domain growth or by generating topological defects, and this impacts the dynamics of the system. However, this nanoscale heterogeneity has not been directly observed. Here we use time- and spectrally resolved coherent X-ray imaging to track the prototypical light-induced insulator-to-metal phase transition in vanadium dioxide on the nanoscale with femtosecond time resolution. We show that the early-time dynamics are independent of the initial spatial heterogeneity and observe a 200 fs switch to the metallic phase. A heterogeneous response emerges only after hundreds of picoseconds. Through spectroscopic imaging, we reveal that the transient metallic phase is a highly orthorhombically strained rutile metallic phase, an interpretation that is in contrast to those based on spatially averaged probes. Our results demonstrate the critical importance of spatially and spectrally resolved measurements for understanding and interpreting the transient phases of quantum materials. © 2022, CC BY.

关键词： Vanadium dioxide

Ultrafast Suppression of the Ferroelectric Instability in KTaO3

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arXiv 2022年

作者： Krapivin, Viktor Gu, Mingqiang Hickox-Young, D. Teitelbaum, S.W. Huang, Y. de la Peña, G. Zhu, D. Sirica, N. Lee, M.-C. Prasankumar, R.P. Maznev, A. Nelson, K.A. Chollet, M. Rondinelli, James M. Reis, D.A. Trigo, M. Stanford PULSE Institute SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Applied Physics Stanford University StanfordCA94305 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Massachusetts Institute of Technology Department of Chemistry United States

We use an x-ray free-electron laser to study the ultrafast lattice dynamics following above band-gap photoexcitation of the incipient ferroelectric potassium-tantalate, KTaO3. We use ultrafast near-UV (central wavelength 266 nm and 50 fs pulse duration) laser light to photoexcite charge carriers across the gap and probe the ultrafast lattice dynamics by recording the x-ray diffuse intensity throughout multiple Brillouin zones using pulses from the Linac Coherent light source (LCLS) (central wavelength 1.3 Å and © 2022, CC BY-NC-ND.

关键词： Excited states

Beyond-Hubbard pairing in a cuprate ladder

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arXiv 2025年

作者： Padma, Hari Thomas, Jinu TenHuisen, Sophia He, Wei Guan, Ziqiang Li, Jiemin Lee, Byungjune Wang, Yu Lee, Seng Huat Mao, Zhiqiang Jang, Hoyoung Bisogni, Valentina Pelliciari, Jonathan Dean, Mark P.M. Johnston, Steven Mitrano, Matteo Department of Physics Harvard University CambridgeMA United States Department of Physics & Astronomy University of Tennessee KnoxvilleTN United States Institute of Advanced Materials and Manufacturing University of Tennessee KnoxvilleTN United States Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory UptonNY United States National Synchrotron Light Source II Brookhaven National Laboratory UptonNY United States Department of Physics Pohang University of Science and Technology Pohang Korea Republic of Max Planck POSTECH/Korea Research Initiative Center for Complex Phase Materials Pohang Korea Republic of 2D Crystal Consortium Pennsylvania State University University ParkPA United States PAL-XFEL Pohang Accelerator Laboratory POSTECH Pohang Korea Republic of

The Hubbard model is believed to capture the essential physics of cuprate superconductors. However, recent theoretical studies suggest that it fails to reproduce a robust and homogeneous superconducting ground state. Here, using resonant inelastic x-ray scattering and density matrix renormalization group calculations, we show that magnetic excitations in the prototypical cuprate ladder Sr14Cu24O41 are inconsistent with those of a simple Hubbard model. The magnetic response of hole carriers, contributing to an emergent branch of spin excitations, is strongly suppressed. This effect is the consequence of d-wave-like pairing, enhanced by nearly an order of magnitude through a large nearest-neighbor attractive interaction. The similarity between cuprate ladders and the two-dimensional compounds suggests that such an enhanced hole pairing may be a universal feature of superconducting cuprates. © 2025, CC BY.

关键词： X ray scattering