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arXiv 2025年

作者： Xu, Chenran Xu, Chen Zhou, Jichen Shan, Zhexu Su, Wenjian Li, Wenbing Xu, Xingqi Watanabe, Kenji Taniguchi, Takashi Zhu, Shiyao Wang, Da-Wei Tang, Yanhao School of Physics Zhejiang University Hangzhou310027 China Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control Zhejiang University Hangzhou310027 China Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan State Key Laboratory for Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China College of Optical Science and Engineering Zhejiang University Hangzhou310027 China Hefei National Laboratory Hefei China

Hot carrier solar cells (HCSCs), harvesting excess energy of the hot carriers generated by above-band-gap photoexcitation, is crucial for pushing the solar cell efficiency beyond the Shockley–Queisser limit, which is challenging to realize mainly due to fast hot-carrier cooling. By performing transient reflectance spectroscopy in a MoSe2/hBN/WS2 junction, we demonstrate the gate-tunable harvest of hot electrons from MoSe2 to WS2. By spectrally distinguishing hot-electron extraction from lattice temperature increase, we find that electrostatically doped electrons in MoSe2 can boost hot-electron extraction density (nET) by factor up to several tens. Such enhancement arises from interaction between hot excitons and doped electrons, which converts the excess energy of hot excitons to excitations of the Fermi sea and hence generates hot electrons. Moreover, nET can be further enhanced by reducing the conduction band offset with external electric field. Our results provide in-depth insights into design of HCSCs with electrostatic strategies. Copyright © 2025, The Authors. All rights reserved.

关键词： Hot electrons

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Electrically-Driven and Exponentially-Enhanced Spin-Photon Interfaces for quantum Networks

arXiv

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arXiv 2024年

作者： Hong, Fang-Yu Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Zhejiang Hangzhou310018 China

We present an electrically-driven scheme for spin-photon quantum interfaces used in quantum networks. Through modulating the motion of a nano cantilever with voltages, optomechanical coupling and spin-mechanical coupling can be exponentially enhanced simultaneously. Numerical simulations show that by applying well-designed voltages high-fidelity quantum interface operations such as generation and absorption of a single-photon with a known wave packet are within the reach of current techniques. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

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Two atoms in a harmonic trap with spin-orbital-angular-momentum coupling

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Physical Review Research 2024年第3期6卷 033200页

作者： Xiao-Long Chen Aixi Chen Shi-Guo Peng Department of Physics Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology

We study the problem of two harmonically trapped atoms in the presence of spin-orbital-angular-momentum (SOAM) coupling. The two-body energy spectrum is numerically calculated by utilizing the exact diagonalization method. We analyze how the degeneracy of energy levels is lifted under the interplay between the interatomic interaction and SOAM coupling. The exact numerical results show excellent agreement with that of perturbation theory in the weak-interaction limit as well as that in the absence of SOAM coupling. The properties of correlations between the two atoms are also discussed with respect to the interaction strength. The findings in this paper may provide valuable insights into few-body physics subjected to SOAM coupling and the possible experimental detection of spectrum functions in many-body systems, such as radiofrequency spectroscopy.

关键词： Cold atoms & matter waves Few-body systems Spin-orbit coupling

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s±-wave superconductivity in pressurized La4Ni3O10

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Physical Review B 2024年第18期110卷 L180501页

作者： Ming Zhang Hongyi Sun Yu-Bo Liu Qihang Liu Wei-Qiang Chen Fan Yang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China School of Physics Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices

Recently, evidence of superconductivity (SC) has been reported in pressurized La4Ni3O10. Here we study its possible pairing mechanism and pairing symmetry. Through fitting the density-functional-theory band structure, we provide a six-orbital tight-binding model. In comparison with the band structure of La3Ni2O7, the additional nonbonding dz2 band is important to the pairing mechanism here. When the multiorbital Hubbard interactions are included, our random-phase-approximation based study yields an s±-wave SC. The dominant Fermi-surface nesting with vector Q1≈(π,π) is between the γ pocket contributed by the bonding dz2 band top and the α1 pocket contributed by the nonbonding dz2 band bottom, leading to the strongest pairing amplitude and opposite gap signs within the two regimes. The dominant real-space pairing is the interlayer dz2-orbital pairing. This s±-wave pairing pattern is insensitive to the band details. Upon electron doping, the Tc would increase promptly before the system enters the Néel-ordered spin-density-wave phase.

关键词： Pairing mechanisms Superconducting order parameter Superconductivity Unconventional superconductors Hubbard model Random phase approximation

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Effect of carbon material additives on hydrogen evolution at rechargeable alkaline iron battery electrodes

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Materials Science for Energy Technologies 2021年 4卷 236-241页

作者： Arunkumar, P.S. Maiyalagan, T. Kheawhom, Soorathep Mao, Shun Jiang, Zhongqing Department of Physics and Nanotechnology SRM Institute of Science and Technology KattankulathurTamilnadu 603203 India Electrochemical Energy Laboratory Department of Chemistry SRM Institute of Science and Technology KattankulathurTamilnadu 603203 India Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China

In recent years a renewed interest in developing iron electrode for iron based accumulators has risen, govern by the progress in nano-materials research that could bring iron based accumulators nearer to their theoretical energy density and capacity. In this aspect, Iron-Air battery chemistry is best suited for current energy crisis in combination with the cost effectiveness, eco-friendliness, recyclability, non-toxicity of the iron materials. The possibility of Iron-Air battery to function as a rechargeable battery makes this electrochemical systems for engaging development. However, some challenges related to the performance of iron electrode needs to be addressed such as the passivation of the iron electrode on discharge due to the accumulation of iron hydroxide and the low efficiency due to the parasitic hydrogen evolution that occurs during the charging. So the proper engineering and the formulation of iron electrodes are necessary to attain the maximum efficiency for Iron-Air battery. In this exertion, different Fe2O3/Carbon (Fe/C) composites are tested as electrodes for Iron air battery. In addition to this, the prepared materials were comprehensively characterized by X-ray diffraction (XRD). The electrochemical effectiveness of the prepared samples were tested in a three electrode ***2O3/MWCNT electrode show the best electrochemical performance exhibits a specific capacity of about 350 mAhg−1 at 10 mA cm−2 compared to the Fe2O3/Graphene of 300 mAhg−1, Fe2O3/Acetylene black of 225 mAhg−1 and Fe2O3/Vulcan carbon of 180 mAhg−1. © 2021

关键词： Cost effectiveness

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General tradeoff relation of fundamental quantum limits for linear multiparameter estimation

arXiv

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arXiv 2024年

作者： Li, Guolong Lu, Xiao-Ming School of Sciences Hangzhou Dianzi University Hangzhou310018 China Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Hangzhou Dianzi University Hangzhou310018 China

Linear measurement is an important class of measurements for sensing classical signals including gravitational wave (GW), dark matter, infrared ray, rotation rate, etc. In this Letter, we focus on multiparameter linear measurement and establish a general tradeoff relation that tightly constrains the fundamental quantum limits of two independent parameters in a monochromatic classical signal detected by any linear quantum device. Such a tradeoff relation is universal and fundamental for multiparameter linear measurement since arising from Heisenberg’s uncertainty principle. Compared with the Holevo Cramér-Rao bound, our tradeoff bound can completely identify the dependence between the attainable precision limits on estimated parameters. The dependence becomes more obvious such that the individual precision can not simultaneously reach the quantum limit as the so-called incompatible coefficient rises. Eventually, we find a necessary condition under which an optimal measurement protocol can saturate the general tradeoff relation, and show that the measurement phase can be tuned for adjusting different precision weight. This result is related to many applications, particularly detuned GW sensors for searching post-merger remnants due to the direct relation between the detunend frequency and incompatible coefficient. Copyright © 2024, The Authors. All rights reserved.

关键词： Cramer-Rao bounds

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Bound states in one-dimensional systems with colored noise

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Physical Review B 2024年第18期110卷 184207-184207页

作者： Xingbo Wei Kewei Feng Tian-Cheng Yi Tong Liu Gao Xianlong Yunbo Zhang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou 310018 China Department of Applied Physics School of Science Nanjing University of Posts and Telecommunications Nanjing 210003 China Department of Physics Zhejiang Normal University Jinhua 321004 China

We investigate the phase transitions in a one-dimensional system with colored noise. Previous studies indicated that the phase diagram of this system included extended and disorder-induced localized phases. However, by studying the properties of wave functions, we find that this phase diagram can be further refined, revealing the existence of a bound phase for the large potential amplitude W and noise control parameter α. In the bound phase, the wave function cannot extend throughout the entire chain, tails decay faster than exponentially, and its distribution expands as the system size increases. By adjusting the potential amplitude to induce a transition from the extended phase to the bound phase, we find that bound states coexist with extended states in the spectrum. In contrast, when the system transitions from the Anderson localized phase to the bound phase, we do not observe the obvious coexistence of Anderson localized and bound states. Finally, by performing the time evolution, we find that the dynamic transition point of the bound phase is inconsistent with the static one for large α.

关键词： Anderson localization Noise Phase transitions Disordered systems Exact diagonalization

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Necessity of orthogonal basis vectors for the two-anyon problem in one-dimensional lattice

arXiv

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arXiv 2024年

作者： Zheng, Cuicui Xie, Jiahui Zhang, Ming Chen, Yajiang Zhang, Yunbo Key Laboratory of Quantum States of Matter and Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China

Few-body physics for anyons has been intensively studied within the anyon-Hubbard model, including the quantum walk and Bloch oscillations of two-anyon states. However, the known theoretical proposal and experimental simulations of two-anyon states in one-dimensional lattice have been carried out by expanding the wavefunction in terms of non-orthogonal basis vectors, which introduces extra non-physical degrees of freedom. In the present work, we deduce the finite difference equations for the two-anyon state in the one-dimensional lattice by solving the Schrödinger equation with orthogonal basis vectors. Such an orthogonal scheme gives all the orthogonal physical eigenstates for the time-independent two-anyon Schrödinger equation, while the conventional (non-orthogonal) method produces a lot of non-physical redundant eigen-solutions whose components violate the anyonic relations. The dynamical property of the two-anyon states in a sufficiently large lattice has been investigated and compared in both the orthogonal and conventional schemes, which proves to depend crucially on the initial states. When the initial states with two anyons on the same site or (next-)neighboring sites are suitably chosen to be in accordance with the anyonic coefficient relation, we observe exactly the same dynamical behavior in the two schemes, including the revival probability, the probability density function, and the two-body correlation, otherwise, the conventional scheme will produce erroneous results which not any more describe anyons. The period of the Bloch oscillation in the pseudo-fermionic limit is found to be twice that in the bosonic limit, while the oscillations disappear for statistical parameters in between. Our findings are vital for quantum simulations of few-body physics with anyons in the lattice. Copyright © 2024, The Authors. All rights reserved.

关键词： Probability density function

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Floquet analysis of extended Rabi models based on high-frequency expansion

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Physical Review A 2022年第5期105卷 053717-053717页

作者： Yibo Liu Lijun Mao Yunbo Zhang Institute of Theoretical Physics and State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan 030006 China Department of Physics Taiyuan Normal University Jinzhong 030619 China Department of Physics and Key Laboratory of Optical Field Manipulation of Zhejiang Province Zhejiang Sci-Tech University Hangzhou 310018 China

The extended quantum Rabi models make a significant contribution to understanding of the quantum nature of the atom-light interaction. We transform two kinds of extended quantum Rabi model, the anisotropic Rabi model and the asymmetric Rabi model, into the rotating frame and regard them as periodically driven quantum systems. The analytical solutions of the quasienergy spectrum as well as the Floquet modes for both models are constructed by applying the Floquet theory and the high-frequency expansion, which is applied to the nonstroboscopic dynamics of physical observables such as atomic inversion, transverse magnetization, and atom-field correlation. For the anisotropic Rabi model, the quasienergy fits well with the numerical results even when the rotating-wave coupling is in the deep strong-coupling regime g≃ℏω if the counter-rotating term is small enough compared to the driving frequency. Avoided level crossing may occur for quasienergy with the same parity when the positive branch spectrum lines for the total excitation number N cross the negative branch lines for N+2, while the high-frequency expansion fails to predict this due to the conservation of the total excitation number. Furthermore, we present analytical and numerical studies of the long-time evolution of population and conclude that the analytical method is credible for the population dynamics. For the asymmetric Rabi model, we find that the external bias field which breaks the parity symmetry of the total excitation number tends to cluster the upper and lower branches into two bundles, and the detuning induced gap in the first temporal Brillouin zone shows a quadratic dependence on the bias. Fourier analysis is applied to extract the frequency composition and two-frequency driving behavior is revealed. Varying the bias strength will change the time-averaged value of the oscillation, which shows how the bias competes with the detuning and atom-field coupling in the driving dynamics. Both models prove

关键词： Floquet systems Rabi model

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Nonthermal dynamics in a spin-12 lattice Schwinger model

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Physical Review B 2023年第10期107卷 104302-104302页

作者： Chunping Gao Zheng Tang Fei Zhu Yunbo Zhang Han Pu Li Chen Institute of Theoretical Physics State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan 030006 China Key Laboratory of Optical Field Manipulation of Zhejiang Province and Physics Department of Zhejiang Sci-Tech University Hangzhou 310018 China Department of Physics and Astronomy and Rice Center for Quantum Materials Rice University Houston Texas 77005 USA

Local gauge symmetry is intriguing for the study of quantum thermalization breaking. For example, in the high-spin lattice Schwinger model (LSM), the local U(1) gauge symmetry underlies the disorder-free many-body localization (MBL) dynamics of matter fields. This mechanism, however, would not work in a spin-12 LSM due to the absence of electric energy in the Hamiltonian. In this paper, we show that the spin-12 LSM can also exhibit disorder-free MBL dynamics, as well as entropy prethermalization, by introducing a four-fermion interaction into the system. The interplay between the fermion interaction and U(1) gauge symmetry endows the gauge fields with an effectively disordered potential which is responsible for the thermalization breaking. It induces anomalous (i.e., nonthermal) behaviors in the long-time evolution of such quantities as local observables, entanglement entropy, and correlation functions. Our work offers a different platform to explore emergent nonthermal dynamics in state-of-the-art quantum simulators with gauge symmetries.

关键词： Cold gases in optical lattices Lattice gauge theory Many-body localization quantum simulation quantum thermodynamics Gauge symmetries

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