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Intrinsic multiferroicity in molybdenum oxytrihalides nanowires

npj Computational Materials 2024年第1期10卷 1310-1317页

作者： Chao Yang Yin Wang Menghao Wu Tai Min Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an710049China Department of Physics International Center for Quantum and Molecular StructuresShanghai UniversityShanghai200444China School of Physics Huazhong University of Science and TechnologyWuhan430074China School of Materials Science and Intelligent Engineering Nanjing UniversitySuzhou215163China

Low-dimensional multiferroics,which simultaneously possess at least two primary ferroic order parameters,hold great promise for post-Moore electronic ***,intrinsic onedimensional(1D)multiferroics with the coexistence of ferroelectricity and ferromagnetism are still yet to be realized,which will be not only crucial for exploring the interplay between low-dimensionality and ferroelectric/ferromagnetic ordering but also significant in rendering application approaches for high density information technologies.

关键词： nanowires ferroelectric rendering

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Mechanisms for electric field induced color change in coupled colloidal quantum dot molecules revealed by low temperatures single particle spectroscopy

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Nano Research 2024年第12期17卷 10346-10354页

作者： Yossef E.Panfil Adar Levi Somnath Koley Einav Scharf Yonatan Ossia Uri Banin Institute of Chemistry and the center for nanoscience and nanotechnology The Hebrew University of JerusalemJerusalem 91904Israel Quantum Engineering Laboratory the Department of Electrical&Systems EngineeringUniversity of PennsylvaniaPhiladelphiaPA 19104-6314USA Institute of Physics BhubaneswarOdisha-751005India

Colloidal quantum dots(QDs),the building blocks of modern displays and optoelectronic devices,have reached the highest level of size and shape control,and stability during the last 30 ***,full utilization of their potential requires integration or assembly of more than one nanocrystal as in the case of coupled quantum dots molecules(CQDM),where two core–shell QDs are fused to form two emission centers in close *** CQDMs were recently shown to switch color under an applied electric field at room *** we use cryogenic single particle spectroscopy of single CQDMs under an electric field to show that various mechanisms can contribute to the spectrum change under an applied electric field at cryogenic *** first mechanism is the control of the delocalized electron wave function when the electric field is applied along the dimer *** electric field bends the conduction band and forces the electron wave function to localize in one of the QDs yielding preferential emission of that particular *** addition,we found that QDs and CQDMs could become sensitive to surface traps under an electric *** the case of CQDMs,that can result in decreasing the intensity of one of the QDs while increasing the other QD’s ***,we show that there are surface charges which screen the applied electric field in some of the *** as well can result in electric field-induced color-tuning of *** the underlying mechanisms responsible for spectral shifts under applied electric fields is critical for the development of color-tunable devices utilizing CQDMs,including efficient displays and single photon sources.

关键词： colloidal quantum dots(QDs) quantum dot molecule nanocrystals single particle spectroscopy electric field

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Fault-Tolerant quantum Computation by Hybrid Qubits with Bosonic Cat Code and Single Photons

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PRX quantum 2024年第3期5卷 030322-030322页

作者： Jaehak Lee Nuri Kang Seok-Hyung Lee Hyunseok Jeong Liang Jiang Seung-Woo Lee Center for Quantum Information Department of Physics and Astronomy Department of Physics Centre for Engineered Quantum Systems School of Physics Pritzker School of Molecular Engineering

Hybridizing different degrees of freedom or physical platforms potentially offers various advantages in building scalable quantum architectures. Here, we introduce a fault-tolerant hybrid quantum computation by building on the advantages of both discrete-variable (DV) and continuous-variable (CV) systems. In particular, we define a CV-DV hybrid qubit with a bosonic cat code and a single photon, which is implementable in current photonic platforms. Due to the cat code encoded in the CV part, the predominant loss errors are readily correctable without multiqubit encoding, while the logical basis is inherently orthogonal due to the DV part. We design fault-tolerant architectures by concatenating hybrid qubits and an outer DV quantum error-correction code such as a topological code, exploring their potential merit in developing scalable quantum computation. We demonstrate by numerical simulations that our scheme is at least an order of magnitude more resource efficient compared to all previous proposals in photonic platforms, allowing us to achieve a record-high loss threshold among existing CV and hybrid approaches. We discuss the realization of our approach not only in all-photonic platforms but also in other hybrid platforms including superconducting and trapped-ion systems, which allows us to find various efficient routes toward fault-tolerant quantum computing.

关键词： quantum computation quantum error correction

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Direct extraction of topological Zak phase with the synthetic dimension

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Light(Science & Applications) 2023年第4期12卷 671-679页

作者： Guangzhen Li Luojia Wang Rui Ye Yuanlin Zheng Da-Wei Wang Xiong-Jun Liu Avik Dutt Luqi Yuan Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Interdisciplinary Center for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China InternationalCenter for Quantum Materials and School of Physics Peking UniversityBeijing 100871China International Quantum Academy Shenzhen 518048China Department of Mechanical Engineering Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkMD 20742USA Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China

Measuring topological invariants is an essential task in characterizing topological phases of *** are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy *** is commonly believed that the bulk band structures could not be directly used to obtain the topological ***,we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger(SSH)model in the synthetic frequency *** synthetic SSH lattices are constructed in the frequency axis of light,by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven *** measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites,where a strong contrast between the non-trivial and trivial topological phases is *** topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices,which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom *** method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions,while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.

关键词： topological trivial synthetic

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Black-hole-inspired thermal trapping with graded heat-conduction metadevices

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National Science Review 2023年第2期10卷 131-138页

作者： Liujun Xu Jinrong Liu Peng Jin Guoqiang Xu Jiaxin Li Xiaoping Ouyang Ying Li Cheng-Wei Qiu Jiping Huang Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Department of Electrical and Computer Engineering National University of Singapore Graduate School of China Academy of Engineering Physics School of Materials Science and Engineering Xiangtan University Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang University International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University

The curved space-time produced by black holes leads to the intriguing trapping *** far,metadevices have enabled analogous black holes to trap light or sound in laboratory ***,trapping heat in a conductive environment is still challenging because diffusive behaviors are *** by black holes,we construct graded heat-conduction metadevices to achieve thermal trapping,resorting to the imitated advection produced by graded thermal conductivities rather than the trivial solution of using insulation materials to confine thermal *** experimentally demonstrate thermal trapping for guiding hot spots to diffuse towards the *** heat-conduction metadevices have advantages in energy-efficient thermal regulation because the imitated advection has a similar temperature field effect to the realistic advection that is usually driven by external energy *** results also provide an insight into correlating transformation thermotics with other disciplines,such as cosmology,for emerging heat control schemes.

关键词： thermal trapping graded metadevices imitated advection

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Two-Dimensional Topological Ferroelectric Metal with Giant Shift Current

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Physical Review Letters 2024年第18期133卷 186801页

作者： Liu Yang Lei Li Zhi-Ming Yu Menghao Wu Yugui Yao Department of Physics Hubei Engineering Research Center of Weak Magnetic-field Detection Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics International Center for Quantum Materials School of Physics

The pursuit for “ferroelectric metal,” which combines seemingly incompatible spontaneous electric polarization and metallicity, has been assiduously ongoing but remains elusive. Unlike traditional ferroelectrics with a wide band gap, ferroelectric (FE) metals can naturally incorporate nontrivial band topology near the Fermi level, endowing them with additional exotic properties. Here, we show first-principles evidence that the metallic PtBi2 monolayer is an intrinsic two-dimensional (2D) topological FE metal, characterized by out-of-plane polarization and a moderate switching barrier. Moreover, it exhibits a topologically nontrivial electronic structure with Z2 invariant equal to 1, leading to a significant FE bulk photovoltaic effect. A slight strain can further enhance this effect to a remarkable level, which far surpasses that of previously reported 2D and 3D FE materials. Our Letter provides an important step toward realizing intrinsic monolayer topological FE metals and paves a promising way for future nonlinear optical devices.

关键词： Ferroelectricity Shift current Topological materials Van der Waals systems Density functional theory First-principles calculations

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Enhancement of TMD Exciton Resonances using Plasmonic Resonators

Enhancement of TMD Exciton Resonances using Plasmonic Resona...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Abudayyeh, Hamza Liu, Zhida Yao, Kan Zheng, Yuebing Li, Xiaoqin Department of Physics Center for Complex Quantum Systems The University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Samples of monolayer, bilayer, trilayer and 4-layer WS2 encapsulated between two layers of hBN are embedded into plasmonic patch antennas. The resulting low mode volume leads to 1000-fold enhancement of dark resonance... 详细信息

ISBN: (纸本)9781957171395

关键词： Excitons

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Enhancement of TMD Exciton Resonances using Plasmonic Resonators

Enhancement of TMD Exciton Resonances using Plasmonic Resona...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Plasmons

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Magnetoelastic coupling driven magnon gap in a honeycomb antiferromagnet

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Physical Review B 2024年第10期110卷 104419页

作者： Jeongheon Choe Andrey Baydin Gaihua Ye Bowen Ma Cynthia Nnokwe Martin Rodriguez-Vega David Lujan Swati Chaudhary Fuyang Tay Jiaming He Hiroyuki Nojiri Jianshi Zhou Gregory A. Fiete Junichiro Kono Rui He Xiaoqin Li Department of Physics Center of Complex Quantum Systems Center for Dynamics and Control of Materials Department of Electrical and Computer Engineering Smalley–Curl Institute Department of Physics Applied Physics Graduate Program Smalley–Curl Institute Department of Mechanical Engineering Institute for Materials Research Department of Physics and Astronomy Department of Materials Science and NanoEngineering

Cobalt titanate, CoTiO3, is a honeycomb antiferromagnet recently confirmed experimentally to host Dirac magnons, topological spin-orbit excitons, and chiral phonons. Here, we investigate a magnon gap at the zone center which calls for a refined spin Hamiltonian. We propose a microscopic model for the magnon gap and attribute it to a lattice-distortion (phonon)-induced higher-order spin interaction. Strong magnetoelastic coupling in CoTiO3 is also evident in Raman spectra, in which the magnetic order exerts a stronger influence on phonons corresponding to in-plane ionic motions than those with out-of-plane motions. We further examine the evolution of the zone-center magnons in a high magnetic field up to 18.5 T via THz absorption spectroscopy measurements. Based on this field dependence, we propose a spin Hamiltonian that not only agrees with magnon dispersion measured by inelastic neutron scattering but also includes fewer exchange constants and a realistic anisotropy term. Our work highlights the broad implications of magnetoelastic coupling in the study of topologically protected bosonic excitations.

关键词： Magnetism Magnons Topological materials Raman spectroscopy Terahertz spectroscopy

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What limits limits?

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National Science Review 2021年第1期8卷 11-14页

作者： Yong-Chun Liu Kun Huang Yun-Feng Xiao Lan Yang Cheng-Wei Qiu State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Frontier Science Center for Quantum Information Tsinghua University Department of Optics and Optical Engineering University of Science and Technology of China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Department of Electrical and Systems Engineering Washington University Department of Electrical and Computer Engineering National University of Singapore

There are fundamental rules and principles setting the limits of physical systems. It triggers an interesting thought—can we break the limits under specific circumstances? A realistic system can only provide limited functionalities because its performance is physically constrained by some fundamental principles.‘Breaking the limit’, which usually implies that the capability of a system could be enhanced significantly,

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