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Remarkable average thermoelectric performance of the highly oriented Bi(Te,Se)-based thin films and devices

Journal of Materiomics 2024年第2期10卷 366-376页

作者： Zhiliang Li Xiaoqi Yang Zhi Gao Jingxuan Wang Yuli Xue Jianglong Wang Qian Cao Zhihai Ding Shufang Wang Hebei Key Lab of Optic-Electronic Information and Materials Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei ProvinceCollege of Physics Science and TechnologyHebei UniversityBaoding071002China Huabei Cooling Device Co. LtdXianghe065400China

Bi(Te,Se)-based compounds have attracted lots of attention for nearly two centuries as one of the most successful commercial thermoelectric(TE)materials due to their high performance at near room *** with 3D bulks,2D thin films are more compatible with modern semiconductor technology and have unique advantages in the construction of micro-and *** device applications,high average TE performance over the entire operating temperature range is ***,highly c-axis-oriented N-type Bi(Te,Se)epitaxial thin films have been successfully prepared using the pulsed laser deposition technology by adjusting the deposition *** film deposited at~260℃demonstrate a remarkable average power factor(PFave)of~24.4 mW·cm^(-1)·K^(-2)over the tem-perature range of 305e470 K,higher than most of the state-of-the-art Bi(Te,Se)-based ***,the estimated average zT value of the film is as high as~*** then constructed thin-film TE devices by using the above oriented Bi(Te,Se)films,and the maximum output power density of the device can reach up to~30.1 W/m^(2)under the temperature difference of 40 ***,the outstanding average TE performance of the highly oriented Bi(Te,Se)thin films will have an excellent panorama of applications in semiconductor cooling and power generation.

关键词： Bismuth telluride Oriented thin film Thermoelectric device Average power factor Output power density

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The ρ radiative decay width from lattice QCD 9

The ρ radiative decay width from lattice QCD

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9th International Workshop on Chiral Dynamics, CD 2018

作者： Petschlies, Marcus Alexandrou, Constantia Leskovec, Luka Meinel, Stefan Rendon, Gumaro Negele, John W. Pochinsky, Andrew Paul, Srijit Syritsyn, Sergey Helmholtz-Institut für Strahlen- und Kernphysik Bonn University Germany Computation-based Science and Technology Research Center Cyprus Institute Department of Physics University of Cyprus Cyprus Jeffersion Lab United States Department of Physics University of Arizona United States Center for Theoretical Physics Laboratory for Nuclear Science Department of Physics Massachusetts Institute of Technology United States Computation-based Science and Technology Research Center Cyprus Institute Cyprus Department of Physics and Astronomy Stony Brook University United States

Pion photoproduction constitutes a prototype process, which allows for the study of the electro-weak decay of a QCD-unstable state, the ρ resonance. It is also the most straightforward process to investigate such (resonant) transition matrix elements in lattice QCD. We performed a lattice calculation of the process ππ → ρ → πγ, at presently the lightest pion mass of 317 MeV and in a large box of size (3.6 fm)3. In addition to outlining the method for our calculation, we give account of our analysis of systematic uncertainties, with focus on parametrization dependence of the P−wave phase shift and the analytic continuation of our lattice data to the ρ resonance pole to extract the coupling |Gρπγ | = 0.0802 (38). © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Uncertainty analysis

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Direct expression for one-loop tensor reduction with Lorentz indices via a generating function

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Physical Review D 2025年第9期111卷 096005-096005页

作者： Chang Hu Yifan Hu Jiyuan Shen College of Physics Science and Technology Hebei University Baoding 071002 China Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory Baoding 071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding 071002 China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study UCAS Hangzhou 310024 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

In [J. High Energy Phys. 02 (2024) 158], we derived a direct expression for one-loop tensor reduction using generating functions and Feynman parametrization in projective space, avoiding recursive relations. However, for practical applications, this expression still presents two challenges: 1) while the final reduction coefficients are expressed in terms of the dimension D and Mandelstam variables, the given expression explicitly contains irrational functions; 2) the expression involves an auxiliary vector R, which can be eliminated via differentiation ∂∂R, but the presence of irrational terms making differentiation cumbersome; and 3) most practical applications require the tensor form with Lorentz indices. In this paper, we provide a rational form of the reduction coefficients with Lorentz indices, free from recursion. Additionally, we provide a pure Wolfram Mathematica implementation of the code. Our practical tests demonstrate that this direct expression achieves significantly higher computational efficiency compared to the traditional Passarino-Veltman reduction or other recursion-based methods.

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Distillation of the Greenberger-Horne-Zeilinger state from arbitrary tripartite states

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Physical Review A 2002年第2期65卷 024301-024301页

作者： Yi-Na Mo Chuan-Feng Li Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China Hefei 230026 China

We present a method of distillation of Greenberger-Horne-Zeilinger states from arbitrary tripartite pure states by local operations and classical communication. We go further to discuss the various results we get and ... 详细信息

关键词： Quantum theory

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Moire-pattern-modulated electronic structures in Sb_(2)Te_(3)/graphene heterostructure

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Nano Research 2022年第2期15卷 1115-1119页

作者： Yin Yin Guanyong Wang Chen Liu Haili Huang Jiayi Chen Jiaying Liu Dandan Guan Shiyong Wang Yaoyii Li Canhua Liu Hao Zheng Jinfeng Jia Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shenyang National Laboratory for Materials ScienceSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Tsung-Dao Lee Institute Shanghai 200240China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

Moire superlattice has recently been found in topological insulators,which can lead to periodic modulation on the electronic *** this work,we report the low-temperature scanning tunneling microscopy study of Sb_(2)Te_(3) films grown on graphitized *** find that substrate temperature can strongly influence the rotation angles between Sb_(2)Te_(3) film and graphene *** kinds of moire patterns are observed at the first quintuple layer Sb_(2)Te_(3) film under different substrate *** shows complicated patterns with a rotation angle of nearly 0°relative to the substrate,another just exhibits simple 1 ×1 structure with a rotation angle of 30°.Other rotation angle like 8.2°is observed at higher substrate temperature as well,which is relatively *** of the d//dV curves from Sb_(2)Te_(3) films with different moire patterns indicates that the superstructure can offer degrees of freedom in tailoring electronic *** work may stimulate the further study on the moire modulation to the electronic properties of topological insulators.

关键词： moire pattern topological insulator electronic structure scanning tunneling microscopy

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Photoionisation detection of a single Er3+ ion with sub-100-ns time resolution

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National science Review 2024年第4期11卷 38-45页

作者： Yangbo Zhang Wenda Fan Jiliang Yang Hao Guan Qi Zhang Xi Qin Changkui Duan Gabriele G.de Boo Brett C.Johnson Jeffrey C.Mc Callum Matthew J.Sellars Sven Rogge Chunming Yin Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics and Engineering Australian National University

Efficient detection of single optical centres in solids is essential for quantum information processing, sensing and single-photon generation *** this work,we use radio-frequency（RF） reflectometry to electrically detect the photoionisation induced by a single Er3+ion in *** high bandwidth and sensitivity of the RF reflectometry provide sub-100-ns time resolution for the photoionisation *** this technique,the optically excited state lifetime of a single Er3+ion in a Si nano-transistor is measured for the first time to be 0.49±0.04μ*** results demonstrate an efficient approach for detecting a charge state change induced by Er excitation and *** approach could be used for fast readout of other single optical centres in solids and is attractive for large-scale integrated optical quantum systems thanks to the multi-channel RF reflectometry demonstrated with frequency multiplexing techniques.

关键词： single optical centres erbium ions RF reflectometry photoionisation detection

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Hydrothermally Obtaining Superconductor Single Crystal of FeSe_(0.2)Te_(0.8)without Interstitial Fe

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Chinese physics Letters 2023年第6期40卷 63-66页

作者：马晟闫珊珊刘家利王怡哲张宇航赵振鲁邹有为李栋刘樾卢佶虎张华杨海涛周放李子安董晓莉赵忠贤 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Guangxi UniversityNanning 530004China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We report a hydrothermal route to remove interstitial excess Fe in non-superconducting iron chalcogenide Fe_(1+δ)Se_(1-x)Te_(x) single *** extra-Fe-free(δ~0)FeSe_(0.2)Te_(0.8) single crystal thus obtained shows bulk superconductivity at T_c~13.8 K,which is about 2 K higher than the FeSe_(0.2)Te_(0.8) sample obtained by usual postannealing *** upper critical fieldμ_0H_(c2) is estimated to be~42.5 T,similar to the annealed FeSe_(0.2)Te_(0.8).It is surprising to find that the hydrothermal FeSe_(0.2)Te_(0.8)exhibits a remarkably small isothermal magnetization hysteresis loop at T=3 *** yields an extremely low critical current density J_(c)~1.1×10^(2)A·cm^(-2)(over 100times smaller than the annealed FeSe_(0.2)Te_(0.8)) and indicates more free vortices in the hydrothermal FeSe_(0.2)Te_(0.8).

关键词： annealed critical Crystal

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Design lithium storage materials by lithium adatoms adsorption at the edges of zigzag silicene nanoribbon: A first principle study

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Applied Surface science 2017年 406卷 161-169页

作者： Guo, Gang Mao, Yuliang Zhong, Jianxin Yuan, Jianmei Zhao, Hongquan Hunan Key Laboratory for Micro–Nano Energy Materials and Devices School of Physics and Optoelectronic Engineering Xiangtan University Hunan411105 China Hunan Key Laboratory for Computation and Simulation in Science and Engineering School of Mathematics and Computational Science Xiangtan University Hunan411105 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing401120 China

First-principles spin-polarized calculations are performed to design lithium storage materials using the active edges of zigzag silicene nanoribbon (ZSiNR). We predict that edge-adsorption of Li adatoms on zigzag silicene nanoribbon is preferred in energy to form new type lithium storage materials. Significant charge transfer from Li adatoms to Si atoms at the edges of ZSiNR is found, indicating the main ionic interactions. It is found that the band structures of ZSiNR with Li adsorptions are sensitive with the variation of sites of adatoms at the two edges. Ferro-magnetic to antiferro-magnetic change is found in ZSiNR with symmetrical adsorption of Li adatoms at its two edges. Other unsymmetrical Li adsorptions at the edges of ZSiNR prefer to stay in ferro-magnetic state as that in narrow pristine ZSiNR. © 2017 Elsevier B.V.

关键词： Adsorption

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Heralded noiseless amplification of photonic qubits

Heralded noiseless amplification of photonic qubits

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International Quantum Electronics Conference, IQEC 2011

作者： Pryde, Geoff J. Kocsis, Sacha Ralph, Tim C. Xiang, Guoyong Centre for Quantum Computation and Communication Technology Centre for Quantum Dynamics Griffith University Brisbane 4111 Australia Centre for Quantum Computation and Communication Technology Department of Physics University of Queensland Brisbane 4072 Australia Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei 230026 China

We experimentally demonstrate the heralded noiseless amplification of a photon polarization qubit subjected to loss, using two amplifier stages based on generalized quantum scissors. This is a key step towards realizi... 详细信息

ISBN: (纸本)9780977565771

关键词： Quantum cryptography

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Unlocking enhanced thermoelectric performance in Cu 2 Se: The synergistic effects of Ag and Sb co-doping and band structure optimization

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Applied Materials Today 2025年 44卷

作者： Hailan Zhang Liedong Zhao Jingxian Wang Guangxu Zhang Qian Cao Zhihai Ding Shufang Wang Jianglong Wang Zhiliang Li Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and Technology Hebei University Baoding 071002 China Xianghe Huiwen Energy Saving Technology Co. Ltd Xianghe 065400 China Engineering Research Center of Zero-Carbon Energy Buildings and Measurement Techniques Ministry of Education Hebei University Baoding 071002 China Institute of Life Science and Green Development Hebei University Baoding 071002 China

High-performance thermoelectric (TE) materials with “phonon glass-electronic crystal (PGEC)” features have attracted global attention in recent decades. Cu 2 Se-based semiconductors, among the most representative PGEC TE materials, have attracted substantial interest. Carrier concentration and energy band regulation are research focuses of enhancing TE performance. In this study, Ag and Sb co-doped Cu 2 Se bulks are synthesized using vacuum melting combine with spark plasma sintering (SPS). Ag substitution weakens the P-type degenerate state, flattens of the valence band top, thereby reducing the hole concentration, and increasing the Seebeck coefficient. Incorporation of Sb causes the conduction band to move down, forming N-type degeneracy, which further decreases the carrier concentration. The combined doping of Ag and Sb significantly enhanced the Seebeck coefficient and notably reduced thermal conductivity. Ultimately, the Sb 0.005 Cu 1.98 Ag 0.02 Se sample achieved the peak zT of 1.57 at 773 K, representing a ∼61.8 % improvement over the pristine Cu 2 Se (∼0.97). Therefore, cation co-doping and band structure optimization are effective strategies for enhancing TE performance.

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