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arXiv 2022年

作者： Li, Yanan Wang, Huichao Wang, Jingyue Wang, Chunming Liu, Yanzhao Ge, Jun Niu, Jingjing Zhang, Wenjie Wang, Pinyuan Bi, Ran Zhang, Jinglei Dai, Ji-Yan Yan, Jiaqiang Mandrus, David Samarth, Nitin Lu, Haizhou Wu, Xiaosong Wang, Jian International Center for Quantum Materials School of Physics Peking University Beijing100871 China School of Physics Sun Yat-sen University Guangzhou510275 China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Peking University Beijing100871 China Department of Physics Shanghai Normal University Shanghai200234 China Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China High Magnetic Field Laboratory Chinese Academy of Sciences Anhui Hefei230031 China Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Department of Physics The Pennsylvania State University University ParkPA16802 United States Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Beijing Academy of Quantum Information Sciences Beijing100193 China Beijing Key Laboratory of Quantum Devices Peking University Beijing100871 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China

Extensive studies of electron transport in Dirac materials have shown positive magneto-resistance (MR) and positive magneto-thermopower (MTP) in a magnetic field perpendicular to the excitation current or thermal gradient. In contrast, measurements of electron transport often show a negative longitudinal MR and negative MTP for a magnetic field oriented along the excitation current or thermal gradient;this is attributed to the chiral anomaly in Dirac materials. Here, we report a very different magneto-thermoelectric transport behavior in the massive Dirac material ZrTe5. Although thin flakes show a commonly observed positive MR in a perpendicular magnetic field, distinct from other Dirac materials, we observe a sharp negative MTP. In a parallel magnetic field, we still observe a negative longitudinal MR, however, a remarkable positive MTP is observed for the fields parallel to the thermal gradients. Our theoretical calculations suggest that this anomalous magneto-thermoelectric behavior can be attributed to the screened Coulomb scattering. This work demonstrates the significance of impurity scattering in the electron transport of topological materials and provides deep insight into the novel magneto-transport phenomena in Dirac materials. © 2022, CC BY.

关键词： Thermal gradients

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Molecular tetraquarks and pentaquarks in chiral effective field theory

arXiv

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arXiv 2022年

作者： Wang, Bo Meng, Lu Zhu, Shi-Lin School of Physical Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China Ruhr-Universität Bochum Fakultät für Physik und Astronomie Institut für Theoretische Physik II BochumD-44780 Germany School of Physics Center of High Energy Physics Peking University Beijing100871 China

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

We studied the DD¯ ∗/DD ¯ ∗, D∗ D¯ ∗, D¯sD∗/D¯ ∗sD, BB¯ ∗/BB ¯ ∗ 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 Zc(3900), Zc(4020), Zcs(3985), Zb(10610), Zb(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 Pc(4312), Pc(4440) and Pc(4457). We further used the parameters fixed from the Pc states to predict the possible molecular states in ΞcD¯ (∗), Ξ0cD¯ (∗) and Ξ∗cD¯ (∗) systems. Our predictions of the ΞcD¯ (∗) bound states are very consistent with two new near-threshold structures recently observed by the LHCb Collaboration. © 2022, CC BY.

关键词： Hadrons

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Separation of micron-sized dust particles in low-pressure air using a dusty plasma ratchet

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Plasma science and technology 2025年第5期27卷

作者： Tian, Miao Li, Shaopeng Yao, Tingyu Wang, Xinzhan Liu, Fucheng He, Yafeng College of Physical Science and Technology Hebei University Baoding071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding071002 China Hebei Key Laboratory of High-Precision Computation and Application of Quantum Field Theory Baoding071002 China

The Feynman ratchet has the ability to convert random fluctuations into directional particle transport. The transport velocity of particles is highly dependent on their size, leading to directional transport and subsequent particle separation under suitable parameter conditions. Here, exploiting the distinct responses of particles with different sizes to the system, the separation of bi-dispersed dust particles is achieved experimentally in air at 35 Pa using a dusty plasma ratchet. To reveal the underlying mechanisms, we construct a plasma model and perform Langevin simulations for the particle separation. Our numerical results reveal that charged dust particles experience an asymmetric ratchet potential, which dictates their directional transport. Crucially, bi-dispersed dust particles are suspended at different heights and are subject to ratchet potentials with opposing asymmetries, resulting in their separation. These findings may offer new perspectives for related fields, including microfluidics, nanotechnology, and micrometer-scale particle manipulation. © 2025 Hefei Institutes of Physical science, Chinese Academy of sciences and IOP Publishing Printed in China.

关键词： Plasma simulation

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The double thresholds distort the lineshapes of the PψsΛ (4338)0 resonance

arXiv

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arXiv 2022年

作者： Meng, Lu Wang, Bo Zhu, Shi-Lin Ruhr-Universität Bochum Fakultät für Physik und Astronomie Institut für Theoretische Physik II BochumD-44780 Germany School of Physical Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation Application of Quantum Field Theory of Hebei Province Baoding071002 China School of Physics Center of High Energy Physics Peking University Beijing100871 China

Very recently, the LHCb Collaboration reported the first observation of the hidden charm pentaquark with strangeness, PψsΛ (4338)0. Considering this state is very close to the Ξ0cD¯0 and Ξ+c D− thresholds, we explore the possible bias of the Breit-Wigner parameterization, with emphasis on the effect of its coupling to the double thresholds Ξ0cD¯0 and Ξ+c D−. We first use a qualitative picture based on the "uniformization" of the Riemann surface of the two-channel system to understand the positions of the enhancement. Then we use the Lippmann-Schwinger equation (LSE) formalism (equivalent to the K-matrix parameterization) with two models, the zero-range model and Flatté model to investigate the J/ψΛ lineshapes. Our results show that the nominal peak of the PψsΛ (4338)0 could arise either from the pole well above the Ξ+c D− threshold on the (−,+) sheet or from the pole well below the Ξ0cD¯0 threshold on the (−,−) sheet in the two-channel system. Using the Breit-Wigner distribution to depict the above two lineshapes could be misleading. We also find a novel type of lineshapes with the enhancement constrained by the threshold difference. We urge the LHCb collaboration to perform the refined experimental analysis considering the unitarity and analyticity, e.g. using the K-matrix parameterization. As a by-product, we obtain that the ratio of the isospin violating decay (formula presented) could be up to 10%. Copyright © 2022, The Authors. All rights reserved.

关键词： Poles

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Versatile Method of Engineering the Band Alignment and the Electron Wavefunction Hybridization of Hybrid Quantum Devices

arXiv

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arXiv 2023年

作者： Li, Guoan Shi, Xiaofan Lin, Ting Yang, Guang Rossi, Marco Badawy, Ghada Zhang, Zhiyuan Shi, Jiayu Qian, Degui Lu, Fang Gu, Lin Wang, An-Qi Tong, Bingbing Li, Peiling Lyu, Zhaozheng Liu, Guangtong Qu, Fanming Dou, Ziwei Pan, Dong Zhao, Jianhua Zhang, Qinghua Bakkers, Erik P.A.M. Nowak, Michal P. Wójcik, Pawel Lu, Li Shen, Jie Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China AGH University of Krakow Academic Centre for Materials and Nanotechnology al. A. Mickiewicza 30 Krakow30-059 Poland AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland Department of Applied Physics Eindhoven University of Technology Eindhoven5600 MB Netherlands State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences P. O. Box 912 Beijing100083 China Beijing National Center for Electron Microscopy Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing100084 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Dongguan523808 China Beijing Academy of Quantum Information Sciences Beijing100193 China Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

Hybrid devices that combine superconductors (S) and semiconductors (Sm) have attracted great attention due to the integration of the properties of both materials, which relies on the interface details and the resulting coupling strength and wavefunction hybridization. However until now, none of the experiments have reported good control of band alignment of the interface, as well as its tunability to the coupling and hybridization. Here, the interface is modified by inducing specific argon milling while maintaining its high-quality, e.g., atomic connection, which results in a large induced superconducting gap and ballistic transport. By comparing with Schrödinger-Poisson calculations, it is proven that this method can vary the band bending/coupling strength and the electronic spatial distribution. In the strong coupling regime, the coexistence and tunability of crossed Andreev reflection and elastic co-tunnelling—key ingredients for the Kitaev chain—are confirmed. This method is also generic for other materials and achieves a hard and huge superconducting gap in Pb-InSb devices. Such a versatile method, compatible with the standard fabrication process and accompanied by the well-controlled modification of the interface, will definitely boost the creation of more sophisticated hybrid devices for exploring physics in solid-state systems. Copyright © 2023, The Authors. All rights reserved.

关键词： III-V semiconductors

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Oligomerized Fused-Ring Electron Acceptors for Efficient and Stable Organic Solar Cells

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Angewandte Chemie 2023年第46期135卷

作者： Xiaobin Gu Prof. Xin Zhang Prof. Hui Huang College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 101408 China

Organic solar cells (OSCs) have attracted wide research attention in the past decades. Very recently, oligomerized fused-ring electron acceptors (OFREAs) have emerged as a promising alternative to small-molecular/polymeric acceptor-based OSCs due to their unique advantages such as well-defined structures, batch reproducibility, good film formation, low diffusion coefficient, and excellent stability. So far, rapid advances have been made in the development of OFREAs consisting of directly/rigidly/flexibly linked oligomers and fused ones. In this Minireview, we systematically summarized the recent research progress of OFREAs, including structural diversity, synthesis approach, molecular conformation and packing, and long-term stability. Finally, we conclude with future perspectives on the challenges to be addressed and potential research directions. We believe that this Minireview will encourage the development of novel OFREAs for OSC applications.

关键词： Diffusion Coefficient Long-Term Stability Molecular Conformation Oligomerized Fused-Ring Electron Acceptors Organic Solar Cells

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Modeling the performance and bandwidth of single-atom adiabatic quantum memories

APL Quantum

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APL Quantum 2024年第2期1卷

作者： Takla Nateeboon Chanaprom Cholsuk Tobias Vogl Sujin Suwanna Optical and Quantum Physics Laboratory Department of Physics Faculty of Science Mahidol University Bangkok 10400 Thailand Department of Computer Engineering TUM School of Computation Information and Technology Technical University of Munich 80333 Munich Germany Abbe Center of Photonics Institute of Applied Physics Friedrich Schiller University Jena 07745 Jena Germany

Quantum memories are essential for quantum repeaters, which will form the backbone of the future quantum internet. Such memory can capture a signal state for a controllable amount of time, after which this state can be retrieved. In this work, we theoretically investigated how atomic material and engineering parameters affect the performance and bandwidth of a quantum memory. We have applied a theoretical model for quantum memory operation based on the Lindblad master equation and adiabatic quantum state manipulation. The materials’ properties and their uncertainty are evaluated to determine the performance of Raman-type quantum memories by showcasing two defects in two-dimensional hexagonal boron nitride. We have derived a scheme to calculate the signal bandwidth based on the material parameters as well as the maximum efficiency that can be realized. The bandwidth depends on four factors: the signal photon frequency, the dipole transition moments in the electronic structure, the cavity volume, and the strength of the external control electric field. As our scheme is general and independent of materials, it can be applied to many other quantum materials with a suitable three-level structure. We, therefore, provided a promising route for designing and selecting materials for quantum memories. Our work is, therefore, an important step toward the realization of a large-scale quantum network.

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Publisher’s Note: “Modeling the performance and bandwidth of single-atom adiabatic quantum memories” [APL Quantum 1, 026107 (2024)]

APL Quantum

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APL Quantum 2024年第2期1卷

This article was originally published online on 29 April 2024 with an affiliation identifier missing for the second author and affiliations 2 and 3 out of order

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Exploiting the photonic nonlinearity of free-space subwavelength arrays of atoms

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Physical Review A 2021年第3期104卷 033718-033718页

作者： Cosimo C. Rusconi Tao Shi J. Ignacio Cirac Max-Planck-Institut für Quantenoptik Hans-Kopfermann-Strasse 1 85748 Garching Germany Munich Center for Quantum Science and Technology Schellingstrasse 4 D-80799 Munich Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China CAS Centre of Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China

Ordered ensembles of atoms, such as atomic arrays, exhibit distinctive features from their disordered counterpart. In particular, while collective modes in disordered ensembles show a linear optical response, collective subradiant excitations of subwavelength arrays are endowed with an intrinsic nonlinearity. Such nonlinearity has both a coherent and a dissipative component: two excitations propagating in the array scatter off each other leading to formation of correlations and to emission into free-space modes. We show how to take advantage of such nonlinearity to coherently prepare a single excitation in a subradiant (dark) collective state of a one-dimensional array as well as to perform an entangling operation on dark states of parallel arrays. We discuss the main source of errors represented by disorder introduced by atomic center-of-mass fluctuations, and we propose a practical way to mitigate its effects.

关键词： Collective effects in quantum optics Superradiance & subradiance

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Effective potential and superfluidity of microwave-dressed polar molecules

arXiv

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arXiv 2022年

作者： Deng, Fulin Chen, Xing-Yan Luo, Xin-Yu Zhang, Wenxian Yi, Su Shi, Tao School of Physics and Technology Wuhan University Hubei Wuhan430072 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China Max-Planck-Institut für Quantenoptik Garching85748 Germany Munich Center for Quantum Science and Technology München80799 Germany Wuhan Institute of Quantum Technology Hubei Wuhan430206 China CAS Center for Excellence in Topological Quantum Computation School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing100191 China

For microwave-dressed polar molecules, we analytically derive an intermolecular potential composed of an anisotropic van der Waals shielding core and a long-range dipolar interaction. We validate this effective potential by comparing its scattering properties with those calculated using the full multi-channel interaction potential. It is shown that scattering resonances can be induced by a sufficiently strong microwave field. We also show the power of the effective potential in the study of many-body physics by calculating the critical temperature of the Bardeen-Cooper-Schrieffer pairing in the microwave-dressed NaK gas. It turns out that the effective potential is well-behaved and extremely suitable for studying the many-body physics of the molecular gases. Our results pave the way for the studies of the many-body physics of the ultracold microwave-dressed molecular gases. © 2022, CC0.

关键词： Microwaves

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