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arXiv 2024年

作者： Niu, Ruirui Li, Zhuoxian Han, Xiangyan Liu, Qianling Qu, Zhuangzhuang Wang, Zhiyu Han, Chunrui Watanabe, Kenji Taniguchi, Takashi Liu, Kaihui Mao, Jinhai Shi, Wu Peng, Bo Han, Zheng Vitto Gan, Zizhao Lu, Jianming State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China University of Chinese Academy of Sciences Beijing100049 China National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan School of Physical Sciences CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing China State Key Laboratory of Surface Physics Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Zhangjiang Fudan International Innovation Center Fudan University Shanghai201210 China National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China

Interfacial ferroelectricity emerges in heterostructures consisting of non-polar van der Waals (vdW) layers, greatly expanding the scope of two dimensional ferroelectrics. In particular, the unconventional moiré ferroelectricity observed in bilayer graphene/boron nitride (BN) heterostructures, exhibits promising functionalities with topological current, superconductivity and synaptic responses. However, the debate about its mechanism – correlation driven charge transfer between two graphene layers – limits device reproducibility and hence large-scale production. Here by designing a single-layer graphene encapsulated by lattice-mismatched WSe2, we identify the ferroelectricity as stemming from – instead of graphene moiré bands – the particular BN, where interfacial sliding ferroelectricity must play a role. With similar structures, multilayer twisted MoS2 is found to reproduce the ferroelectricity. The key is a conductive moiré ferroelectric, where the screened gate and the pinned domain wall together result in unchanged electronic states, i.e. anomalous screening. The intimate connection to interfacial sliding ferroelectricity thus provides advantages of diverse choices of constituent materials and robust polarization switching while preserving the unique anomalous screening, paving the way to reproducible and reliable memory-based devices in artificial intelligence. © 2024, CC BY.

关键词： Ferroelectricity

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Spin-Holstein Models in Trapped-Ion Systems

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Physical Review Letters 2022年第12期128卷 120404-120404页

作者： J. Knörzer T. Shi E. Demler J. I. Cirac Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Straße 1 D-85748 Garching Germany Munich Center for Quantum Science and Technology (MCQST) Schellingstraße 4 D-80799 München Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences P.O. Box 2735 Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Harvard University Cambridge Massachusetts 02138 USA Institute for Theoretical Physics ETH Zurich 8093 Zurich Switzerland

In this work, we highlight how trapped-ion quantum systems can be used to study generalized Holstein models, and benchmark expensive numerical calculations. We study a particular spin-Holstein model that can be implemented with arrays of ions confined by individual microtraps, and that is closely related to the Holstein model of condensed matter physics, used to describe electron-phonon interactions. In contrast to earlier proposals, we focus on simulating many-electron systems and inspect the competition between charge-density wave order, fermion pairing, and phase separation. In our numerical study, we employ a combination of complementary approaches, based on non-Gaussian variational ansatz states and matrix product states, respectively. We demonstrate that this hybrid approach outperforms standard density-matrix renormalization group calculations.

关键词： Quantum simulation Superconductivity Trapped ions Holstein model Matrix product states Variational approach

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FORCE-FREE ELECTROMAGNETIC CONFIGURATIONS IN FLRW GEOMETRY

arXiv

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arXiv 2024年

作者： Adhikari, Rakshak Menon, Govind Medvedev, Mikhail V. Department of Physics University of Kansas LawrenceKS66045 United States Center for Relativity and Cosmology Troy University TroyAL36082 United States Institute for Advanced Study School for Natural Sciences PrincetonNJ08540 United States Department of Astrophysical Sciences Princeton University PrincetonNJ08544 United States Institute for Theory and Computation Harvard University CambridgeMA02138 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States

Force-free electrodynamics is the theoretical paradigm used to describe electromagnetic fields in a region where the inertia of plasma is negligible compared to the strength of the electromagnetic field. While these fields are studied extensively around accreting black holes in an attempt to describe energy extraction, force-free fields also routinely appear in the study of cosmological magnetic fields. Despite this, there are no systematic studies of exact force-free fields in an expanding universe. In this paper, we use geometric methods to find a wide variety of force-free solutions in a fixed Friedmann-Lemaître-Robertson-Walker metric background. The method we use can be directly generalized to any arbitrary electrically neutral space-time, and hence, provides a powerful tool to study force-free fields in general. Copyright © 2024, The Authors. All rights reserved.

关键词： Electrodynamics

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Λc(2910) and Λc(2940) as the conventional baryons dressed with the D∗N channel

arXiv

引用

arXiv 2022年

作者： Zhang, Zi-Le Liu, Zhan-Wei Luo, Si-Qiang Wang, Fu-Lai Wang, Bo Xu, Hao School of Physical Science and Technology Lanzhou University Lanzhou730000 China Research Center for Hadron Csr Physics Lanzhou University Institute of Modern Physics of Cas Lanzhou730000 China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Frontiers Science Center for Rare Isotopes Lanzhou University Lanzhou730000 China School of Physical Science and Technology Hebei University Baoding071002 China Key Lab. of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China Research Center for Computational Physics of Hebei Province Baoding071002 China Institute of Theoretical Physics College of Physics and Electronic Engineering Northwest Normal University Lanzhou730070 China Lanzhou Center for Theoretical Physics Lanzhou University Lanzhou730000 China

In this work, we treat Λc(2910)+and Λc(2940)+as the conventional udc cores dressed with the D∗N channel. We provide a possible interpretation to both Λc(2910)+and Λc(2940)+within the same framework. In the study, we consider not only the effects between the conventional triquark core and the D∗N channel but also the D∗N-D∗N interactions. The mass of Λcstate with JP= 1/2-is larger than that with JP= 3/2-in this unquenched picture, which is very different from the prediction of the conventional quenched quark model. Based on the mass spectrum, the spin-parity of Λc(2940)+is more likely to be 1/2-while Λc(2910)+prefers 3/2-. We look forward to the future experiments can test our results with more precise experimental data. Copyright © 2022, The Authors. All rights reserved.

关键词： Mass spectrometry

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Exceptional entanglement phenomena: non-Hermiticity meeting non-classicality

arXiv

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arXiv 2022年

作者： Han, Pei-Rong Wu, Fan Huang, Xin-Jie Wu, Huai-Zhi Zou, Chang-Ling Yi, Wei Zhang, Mengzhen Li, Hekang Xu, Kai Zheng, Dongning Fan, Heng Wen, Jianming Yang, Zhen-Biao Zheng, Shi-Biao Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fujian Fuzhou350108 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Institute of Physics Chinese Academy of Sciences Beijing100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Department of Physics Kennesaw State University MariettaGA30060 United States Hefei National Laboratory Hefei230088 China

Non-Hermitian (NH) extension of quantum-mechanical Hamiltonians represents one of the most significant advancements in physics. During the past two decades, numerous captivating NH phenomena have been revealed and demonstrated, but all of which can appear in both quantum and classical systems. This leads to the fundamental question: What NH signature presents a radical departure from classical physics? The solution of this problem is indispensable for exploring genuine NH quantum mechanics, but remains experimentally untouched upon so far. Here we resolve this basic issue by unveiling distinct exceptional entanglement phenomena, exemplified by an entanglement transition, occurring at the exceptional point (EP) of NH interacting quantum systems. We illustrate and demonstrate such purely quantum-mechanical NH effects with a naturally-dissipative light-matter system, engineered in a circuit quantum electrodynamics architecture. Our results lay the foundation for studies of genuinely quantum-mechanical NH physics, signified by EP-enabled entanglement behaviors. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum entanglement

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Sub-megahertz homogeneous linewidth for Er in Si via in situ single photon detection

arXiv

引用

arXiv 2021年

作者： Berkman, Ian R. Lyasota, Alexey de Boo, Gabriele G. Bartholomew, John G. Johnson, Brett C. McCallum, Jeffrey C. Xu, Bin-Bin Xie, Shouyi Ahlefeldt, Rose L. Sellars, Matthew J. Yin, Chunming Rogge, Sven Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales SydneyNSW2052 Australia Centre for Engineered Quantum Systems School of Physics University of Sydney SydneyNSW2006 Australia University of Sydney Nano Institute University of Sydney SydneyNSW2006 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne VIC3010 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University VIC3001 Australia Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics Australian National University CanberraACT0200 Australia Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China Hefei230026 China

We studied the optical properties of a resonantly excited trivalent Er ensemble in Si accessed via in situ single photon detection. A novel approach which avoids nanofabrication on the sample is introduced, resulting in a highly efficient detection of 70 excitation frequencies, of which 63 resonances have not been observed in literature. The center frequencies and optical lifetimes of all resonances have been extracted, showing that 5 % of the resonances are within 1 GHz of our electrically detected resonances and that the optical lifetimes range from 0.5 ms up to 1.5 ms. We observed inhomogeneous broadening of less than 400 MHz and an upper bound on the homogeneous linewidth of 1.4 MHz and 0.75 MHz for two separate resonances, which is a reduction of more than an order of magnitude observed to date. These narrow optical transition properties show that Er in Si is an excellent candidate for future quantum information and communication applications. Copyright © 2021, The Authors. All rights reserved.

关键词： Photons

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Robust stimulated Raman shortcut-to-adiabatic passage by invariant-based optimal control

arXiv

引用

arXiv 2021年

作者： Song, Xue-Ke Meng, Fei Liu, Bao-Jie Wang, Dong Ye, Liu Yung, Man-Hong School of Physics and Material Science Anhui University Hefei230601 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China

The stimulated Raman adiabatic passage (STIRAP) shows an efficient technique that accurately transfers population between two discrete quantum states with the same parity, in three-level quantum systems based on adiabatic evolution. This technique has widely theoretical and experimental applications in many fields of physics, chemistry, and beyond. Here, we present a generally robust approach to speed up STIRAP with invariant-based shortcut to adiabaticity. By controlling the dynamical process, we inversely design a family of Hamiltonians that can realize fast and accurate population transfer from the first to the third level, while the systematic error is largely suppressed in general. Furthermore, a detailed trade-off relation between the population of the intermediate state and the amplitudes of Rabi frequencies in the transfer process is illustrated. These results provide an optimal route toward manipulating the evolution of three-level quantum systems in future quantum information processing. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum optics

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Negative nonlocal vicinity resistance of viscous flow in a two-dimensional electron system

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Physical Review B 2021年第15期104卷 155308-155308页

作者： Wei-Jie Ji Shu-Yu Zheng Li Lu Kai Chang Chi Zhang State Key Laboratory of Superlattices and Microstructures (SKLSM) Institute of Semiconductors Chinese Academy of Science P.O. Box 912 Beijing 100083 China College of Material Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100190 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

We perform a quantum transport study of Hall viscous liquid in multiterminal narrow Hallbar devices of a high-mobility two-dimensional electron system (2DES) in GaAs/AlGaAs heterostructure. In the nonlocal transport measurements of vicinity geometry under magnetic fields (B), we observe that the absolute negative magnetoresistance (Rxx) value (Rmin<0) and the corresponding magnetic field (Bmin) are both inversely proportional to the adjacent Hallbar arm distance (L). The occurrence of negative resistance is dependent on the characteristic lengths of the devices and the electron flow direction under B-fields. The minimal resistance Rmin occurs when the cyclotron radius RC approximates L. Multiples of high-order (nth-order) Rmin,n's persist from low to high magnetic fields in a large sample size of L=5μm. Our experimental study reveals the transport behaviors in the vicinity regime, where the negative resistances depict viscous electronic flows in the high-mobility 2DES. In addition, the negative and high-order minimal resistances expand to a magnetic field of several kGs.

关键词： Fractional quantum Hall effect Integer quantum Hall effect Magnetoresistance III-V semiconductors Two-dimensional electron gas Two-dimensional electron system Hall bar Resistivity measurements

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Molecular tetraquarks and pentaquarks in chiral effective field theory

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Nuclear and Particle physics Proceedings 2023年 324-329卷 45-48页

作者： Wang, Bo Meng, Lu Zhu, Shi-Lin School of Physical Science and Technology Hebei University Baoding 071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002 China Ruhr-Universität Bochum Fakultät für Physik und Astronomie Institut für Theoretische Physik II Bochum D-44780 Germany School of Physics Center of High Energy Physics Peking University Beijing 100871 China

We studied the DD¯⁎/D¯D⁎, D⁎D¯⁎, D¯sD⁎/D¯s⁎D, BB¯⁎/B¯B⁎ and B⁎B¯⁎ di-hadron interactions in chiral effective field theory (χEFT) up to the next-to-leading (NLO) order. The abov... 详细信息

We studied the DD¯^⁎/D¯D^⁎, D^⁎D¯^⁎, D¯_sD^⁎/D¯_s^⁎D, BB¯^⁎/B¯B^⁎ and B^⁎B¯^⁎ di-hadron interactions in chiral effective field theory (χEFT) up to the next-to-leading (NLO) order. The above-threshold tetraquark states Z_c(3900), Z_c(4020), Z_cs(3985), Z_b(10610), Z_b(10650) can be explained as the corresponding di-hadron resonances, respectively. We also studied the Σ_c^(⁎)D¯^(⁎) interactions to investigate the three hidden-charm pentaquarks P_c(4312), P_c(4440) and P_c(4457). We further used the parameters fixed from the P_c states to predict the possible molecular states in Ξ_cD¯^(⁎), Ξ_c^′D¯^(⁎) and Ξ_c^⁎D¯^(⁎) systems. Our predictions of the Ξ_cD¯^(⁎) bound states are very consistent with two new near-threshold structures recently observed by the LHCb Collaboration. © 2023 Elsevier B.V.

关键词： Bound states and resonances Chiral EFT Hadronic molecules Heavy quark symmetry

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Optically Detected Magnetic Resonance of Nitrogen-Vacancy Centers in Diamond under Weak Laser Excitation

arXiv

引用

arXiv 2023年

作者： Yu, Yong-Hong Zhang, Rui-Zhi Xu, Yue Chen, Xiu-Qi Zheng, Huijie Li, Quan Liu, Ren-Bao Pan, Xin-Yu Budker, Dmitry Liu, Gang-Qin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Department of Physics Centre for Quantum Coherence The Hong Kong Institute of Quantum Information Science and Technology The Chinese University of Hong Kong New Territories Hong Kong CAS Center of Excellence in Topological Quantum Computation Beijing100190 China Johannes Gutenberg-Universität Mainz Mainz55128 Germany Helmholtz-Institut GSI Helmholtzzentrum für Schwerionenforschung Mainz55128 Germany Department of Physics University of California BerkeleyCA94720 United States

As promising quantum sensors, nitrogen-vacancy (NV) centers in diamond have been widely used in frontier studies in condensed matter physics, material science, and life sciences. In practical applications, weak laser excitation is favorable as it reduces the side effects of laser irradiation, such as phototoxicity and heating. Here we report a combined theoretical and experimental study of (near) zero-field optically detected magnetic resonance (ODMR) of NV-center ensembles under weak 532-nm laser excitation. In this region, both the width and splitting of the ODMR spectra decrease with increasing laser power. This power dependence is reproduced with a model that accounts for the laser-induced charge neutralization of NV−- N+ pairs, which alters the local electric field environment. These results are important for the understanding and development of NV-based quantum sensing in light-sensitive applications. © 2023, CC BY-NC-ND.

关键词： Laser excitation

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