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Aggregate 2023年第6期4卷 172-179页

作者： Xiaobin Gu Yanan Wei Guanyu Lu Ziyang Han Di Zheng Guanghao Lu Jianqi Zhang Zhixiang Wei Yunhao Cai Xin Zhang Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicsUniversity of Chinese Academy of SciencesBeijingChina Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’anChina CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina

Organic solar cells(OSCs)have attracted extensive attention from both academia and industry in recent years due to their remarkable improvement in power conversion efficiency(PCE).However,the Golden Triangle(the balance of efficiency-stability-cost)required for large-scale industrialization of OSCs still remains a great ***,a new nonfused-ring electron acceptor(NFREA)BF and its polymerized counterpart PBF were designed and synthesized,and their photovoltaic performance,storage stability and material cost were systematically *** blended with a widely-used polymer donor PBDB-T,the PBFbased all-polymer solar cell(all-PSC)displayed a record high PCE of 12.61%for polymerized NFREAs(PNFREAs)with an excellent stability(95.2%of initial PCE after 800 h storage),superior to the BF ***,PBF-based allPSC possesses the highest industrial figure-of-merit(i-FOM)value of 0.309 based on an efficiency-stability-cost evaluation,in comparison to several representative OSC systems(such as PM6:Y6 and PBDB-T:PZ1).This work provides an insight into the balance of efficiency,stability,and cost,and also indicates that the PNFREAs are promising materials toward the commercial application of OSCs.

关键词： all-polymer solar cells efﬁciency-stability-cost balance noncovalently conformational locks organic solar cell polymerized nonfused-ring electron acceptors

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Doubled Moiré fat bands in double-twisted few-layer graphite

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science China(physics,Mechanics & Astronomy) 2023年第2期66卷 95-101页

作者： Zhen Ma Shuai Li Ming Lu Dong-Hui Xu Jin-Hua Gao XinCheng Xie School of Physics Wuhan National High Magnetic Field CenterHuazhong University of Science and TechnologyWuhan 430074China Beijing Academyof Quantum Information Sciences Beijing100193China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 400044China Center of Quantum Materials and Devices Chongqing UniversityChongqing 400044China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We study the electronic structure of double-twisted few-layer graphite(DTFLG),which consists of three few-layer graphites(FLGs),i.e.,an ABA-stacked graphene multilayer,stacked with two twist *** consider two categories of DTFLG,the alternately and chirally twisted cases,according to the rotation direction of the two twist *** show that,once the middle FLG of DTFLG is not thinner than the trilayer,both types of DTFLG can remarkably host two pairs of degenerate Moire flat bands(MFBs) at EF,twice that of the magic angle twisted bilayer graphene(TBG).The doubled MFBs of DTFLG lead to a doubled density of states(DOS) at the Fermi level EF,which implies much stronger correlation effects than *** degeneracy of MFBs can be lifted by a perpendicular electric field,and the isolated MFBs have a nonzero valley Chern *** also reveal the peculiar wave function patterns of the MFB s in *** results establish a new family of Moire systems that have a much higher DOS at EFand thus possibly much stronger correlation effects.

关键词： twisted bands doubled

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Analytical solution for the surface states of the antiferromagnetic topological insulator MnBi2Te4

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Physical Review B 2020年第24期102卷 241406(R)-241406(R)页

作者： Hai-Peng Sun C. M. Wang Song-Bo Zhang Rui Chen Yue Zhao Chang Liu Qihang Liu Chaoyu Chen Hai-Zhou Lu X. C. Xie Department of Physics Harbin Institute of Technology Harbin 150001 China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology (SUSTech) Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China Department of Physics Shanghai Normal University Shanghai 200234 China Institute for Theoretical Physics and Astrophysics University of Wurzberg D-97074 Wurzburg Germany International Center for Quantum Materials School of Physics Peking University Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Beijing Academy of Quantum Information Sciences West Building 3 No. 10 Xibeiwang East Road Haidian District Beijing 100193 China

Recently, the intrinsic magnetic topological insulator MnBi2Te4 has attracted great attention. It has an out-of-plane antiferromagnetic order, which is believed to open a sizable energy gap in the surface states. This gap, however, was not always observable in the latest angle-resolved photoemission spectroscopy (ARPES) experiments. To address this issue, we analytically derive an effective model for the two-dimensional (2D) surface states by starting from a three-dimensional (3D) Hamiltonian for bulk MnBi2Te4 and taking into account the spatial profile of the bulk magnetization. Our calculations suggest that the diminished surface gap may be caused by a much smaller and more localized intralayer ferromagnetic order. In addition, we calculate the spatial distribution and penetration depth of the surface states, which indicates that the surface states are mainly embedded in the first two septuple layers from the terminating surface. From our analytical results, the influence of the bulk parameters on the surface states can be found explicitly. Furthermore, we derive a k·p model for MnBi2Te4 thin films and show the oscillation of the Chern number between odd and even septuple layers. Our results will be helpful for the ongoing explorations of the MnBixTey family.

关键词： Quantum anomalous Hall effect Surface states Topological materials

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Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-Group Engineering and Noncovalently Conformational Locks

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Chinese Journal of Chemistry 2024年第5期42卷 485-490页

作者： Bo Liu Congqi Li Xiaobin Gu Yinghui Han Zhixiang Wei Yunhao Cai Xin Zhang Hui Huang Yanping Huo School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhouGuangdong510006 China 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 SciencesBeijing100049 China College Resources and Environment University of Chinese Academy of SciencesBeijing100049 China Center for Excellence in Nanoscience (CAS) & Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and TechnologyBeijing100190 China

By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and *** with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader light absorption range,more coplanarπ-conjugated backbone,and appropriate crystallinity according to the experimental and theoretical *** organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%,which is much higher than those of J52:NoCA-17(9.50%)and J52:NoCA-18(11.77%),mainly due to more efficient exciton dissociation,better and balanced charge mobility,suppressed recombination loss,shorter charge extraction time,longer charge carrier lifetimes,and more favorable blend film *** findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs.

关键词： Organic solar cells Nonfused-ring electron acceptors Asymmetric end-group engineering Noncovalently conformational locks Low-cost acceptors

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Enhancing thermoelectric performance of n-type AgBi_(3)S_(5)through synergistically optimizing the effective mass and carrier mobility

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Journal of Materiomics 2023年第5期9卷 874-881页

作者： Xin Qian Xiaoxue Zhang Haoran Guo Bangfu Ding Mingjing Chen Jiang-Long Wang Li-Dong Zhao Shu-Fang Wang Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China College of Quality and Technical Supervision Hebei UniversityBaoding071002China Key Laboratory of Brain-like Neuromorphic Devices and Systems of Hebei Province College of Electron and Information EngineeringHebei UniversityBaoding071002China School of Materials Science and Engineering Beihang UniversityBeijing100191China

AgBi_(3)S_(5) is a new n-type thermoelectric material that is environmentally friendly and composed of elements of earth-abundant,non-toxic and high performance-cost *** compound features an intrinsically low thermal conductivity derived from its complex monoclinic ***,the terrible electrical transport properties greatly limited the improvement of thermoelectric *** previous studies considered that carrier concentration is the main reason for low electrical conductivity and focused on improving carrier concentration by aliovalent ion *** this work,we found that the critical parameter that restricts the electric transport performance of AgBi_(3)S_(5)was the extremely low carrier mobility instead of the carrier *** to the Pisarenko relationships and density functional theory calculations,Nb doping can sharpen the conduction band of AgBi_(3)S_(5),which contributes to reducing the effective mass and improving the carrier *** a further increase of the Nb doping content,the conduction band convergence can enlarge the effective mass and preserve the carrier *** with the decrease in lattice thermal conductivity due to the intensive phone scattering,a maximum ZT value of~0.50 at 773 K was achieved in Ag_(0.97)Nb_(0.03)Bi_(3)S_(5),which was~109.6%higher than that of pure *** work will stimulate the new exploration of high-performance thermoelectric materials in ternary metal sulfides.

关键词： Thermoelectric AgBi_(3)S_(5) Effective mass Carrier mobility ZT value

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In-Situ Single-Photon Detection of Er Sites in Si

In-Situ Single-Photon Detection of Er Sites in Si

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CLEO: QELS_Fundamental science, QELS 2022

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 The University of Sydney SydneyNSW2006 Australia The University of Sydney Nano Institute The 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 School of Physical Sciences University of Science and Technology of China Hefei230026 China

Using sample-on-SSPD and photoluminescence excitation spectroscopy, we demonstrate Er sites in Si with inhomogeneous broadening below 100 MHz, a 350 kHz upper bound on the homogeneous linewidth, and electron T1 lower ... 详细信息

ISBN: (纸本)9781557528209

关键词： Particle beams

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Manipulation of Dirac Fermions in Nanochain-Structured Graphene

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Chinese physics Letters 2021年第9期38卷 74-79页

作者： Wen-Han Dong De-Liang Bao Jia-Tao Sun Feng Liu Shixuan Du Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China School of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering University of UtahSalt Lake CityUtah 84112USA CAS Center for Excellence in Topological Quantum Computation Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Graphene has afforded an ideal 2D platform for investigating a rich and fascinating behavior of Dirac ***,we develop a theoretical mechanism for manipulating the Dirac fermions in graphene,such as from type- Ⅰ to type-Ⅱ and type-Ⅲ,by a top-down nanopatterning *** demonstrate that by selective chemical adsorption to pattern the 2D graphene into coupled 1D armchair chains(ACs),the intrinsic isotropic upright Dirac cone becomes anisotropic and strongly *** on model analyses and first-principles calculations,we show that both the shape and tilt of Dirac cone can be tuned by the species of chemisorption,e.g.,halogen vs hydrogen,which modifies the strength of inter-AC ***,the topological edge states and transport properties of the engineered Dirac fermions are *** work sheds lights on understanding the Dirac fermions in a nanopatterned graphene platform,and provides guidance for designing nanostructures with novel functionality.

关键词： Dirac Fermi topological

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Dependence of the correlated-momentum patterns in double ionization on the carrier-envelope phase and intensity of a few-cycle laser pulse

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Physical Review A 2010年第6期82卷 063423-063423页

作者： G. G. Xin D. F. Ye J. Liu Key Laboratory of Cluster Science and Department of Physics School of Science Beijing Institute of Technology Beijing 100081 China Science and Technology Computation Physics Laboratory Beijing Institute of Applied Physics and Computational Mathematics Beijing 100088 China Graduate School China Academy of Engineering Physics Beijing 100088 China Center for Applied Physics and Technology Peking University Beijing 100084 China

In the present paper, we investigate the correlated electron emission of atoms irradiated by a few-cycle laser pulse, with emphasis on the correlated longitudinal momentum spectra. We find that the spectra show clear v-shaped structures, in analogy to what was observed recently in long-pulse experiments. Moreover, the patterns of the spectra depend sensitively on the carrier-envelope phase as well as the laser intensity. The v-shaped structure is more pronounced at lower and higher intensities and becomes obscure at medium intensity. At a lower intensity, upon change of the phase from 0 to π/2, the v-shaped structure shifts from the first quadrant to the third quadrant and the ratios between the double ionization yields in the first and third quadrants are found to increase by a few orders of magnitude. The semiclassical rescattering model is exploited in the preceding calculations and the underlying mechanisms are uncovered by analyzing the subcycle dynamics of classical trajectories.

关键词： Electron emission

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Coherence dynamics of a two-mode Bose-Einstein condensate coupled with the environment

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Physical Review A 2013年第6期88卷 063642-063642页

作者： Yixiao Huang Qing-Shou Tan Li-Bin Fu Xiaoguang Wang Zhejiang Institute of Modern Physics Department of Physics Zhejiang University Hangzhou 310027 China National Key Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China

We investigate the coherence dynamics of a two-mode Bose-Einstein condensate coupled with the environment in the mean-field approximation. We give an analytical result of the time-average coherence in the absence of system-environment coupling, and find that the time-average coherence attains its maximum value at the critical point which corresponds to the boundary between the self-trapping regime and the Josephson oscillation regime. The effect of noise on dynamical coherence is also considered by analyzing the couplings of the condensate to the environment. With the first kind of coupling, the coherence finally stabilizes at a fixed value. Meanwhile, we show that the presence of the noise can even enhance the coherence for some particular interaction. With the second kind of coupling as collisional dephasing, the noise leads a sudden transition of the coherence which then subjects to an exponential decay.

关键词： COHERENT states DYNAMICS BOSE-Einstein condensation MEAN field theory APPROXIMATION theory CRITICAL point

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Interaction-free measurements of quantum objects 1

Interaction-free measurements of quantum objects

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1st International Conference on Quantum Information, ICQI 2001

作者： Zhou, Xingxiang Zhou, Zheng-Wei Guo, Guang-Can Feldman, Marc J. Superconducting Electronics Lab Electrical and Computer Engineering Department University of Rochester NY14627 United States Laboratory of Quantum Communication and Quantum Computation Department of Physics University of Science and Technology of China Anhui Hefei230026 China

We show that it is possible in principle to realize a unit-efficiency initial state preserving interaction-free measurements (IFM) of quantum objects characterized by their superpositions. Some generalized work is als...

ISBN: (纸本)1557526540

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