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Local Density of States Modulated by Strain in Marginally Twisted Bilayer Graphene

Chinese physics Letters 2022年第4期39卷 61-66页

作者： Jia-Jun Ma Zhen-Yu Wang Shui-Gang Xu Yu-Xiang Gao Yu-Yang Zhang Qing Dai Xiao Lin Shi-Xuan Du Jindong Ren Hong-Jun Gao Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China CAS Key Laboratory of Nanophotonic Materials and Devices CAS Key Laboratory of Standardization and Measurement for Nano-technologyNational Center for Nanoscience and TechnologyBeijing 100190China

In marginally twisted bilayer graphene,the Moirépattern consists of the maximized AB(BA)stacking regions,minimized AA stacking regions and triangular networks of domain *** we realize the strain-modulated electronic structures of marginally twisted bilayer graphene by scanning tunneling microscopy/spectroscopy and density functional theory(DFT)*** experimental data show four peaks near the Fermi energy at the AA *** calculations indicate that the two new peaks closer to the Fermi level may originate from the intrinsic heterostrain and the electric field implemented by back gate is likely to account for the observed shift of the four ***,the d I/d V map across Moirépatterns with different strain strengths exhibits a distinct appearance of the helical edge states.

关键词： twisted Fermi stacking

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White-light-driven fluorescence switch for super-resolution imaging guided photodynamic and photoacid therapy

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science China Chemistry 2022年第12期65卷 2528-2537页

作者： Hao Chen Kaikai Wen Yu Lu Xin Zhang Yuhao Shi Qinqin Shi Han Ma Qian Peng 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 SciencesBeijing100049China Department of Neurosurgery and Health Science Center Shenzhen Second People’s HospitalThe First Affiliated HospitalShenzhen UniversityShenzhen518035China School of Chemical Sciences University of Chinese Academy of SciencesBeijing100049China Department of Dermatology&Guangdong Provincial Key Laboratory of Biomedical Imaging The Fifth Affiliated Hospital Sun Yat-sen UniversityZhuhai519000China

Photocaged fluorophores with photoactivatable characteristics presented important applications in imaging the biological structures and *** advantage of their super-resolution imaging merits to manipulate and visualize anti-cancer treatment is always a goal of modern clinical *** photodynamic therapy(PDT) is a noninvasive treatment but limited in intracellular oxygen *** I PDT and photoacid therapy(PAT) are two effective supplements of traditional PDT especially in hypoxic ***,a novel white-light-driven fluorescence switch(7H-dibenzo[c,g]carbazol-7-yl)(2-iodophenyl)methanone(2IB) was designed and synthesized as an unprecedent “all in one” platform for stochastic optical reconstruction microscopy(STORM) imaging guided Type Ⅰ/Ⅱ PDT and *** experimental and theoretical studies revealed that the working mechanism is based on two competing paths under excitation:photosensitization and photocyclization *** intersystem crossing(ISC) ensured the generation of reactive oxygen species(ROS) for PDT,while low energy barrier facilitated the photocyclization reaction that simultaneously yielded emissive fluorophores(2IBC) and H^(+) for super-resolution imaging and photoacid,***,the fluorescent intensity of mitochondria-targeted 2IBC was positively correlated with treatment efficacy,which is beneficial to spatiotemporally visualized therapeutic process and *** a result,superior anti-tumor performance was achieved in vitro and in *** contribution provided a multifunctional nanodrug paradigm for multimode cancer diagnosis and treatment.

关键词： photocaged fluorophores super-resolution imaging type I/II photodynamic therapy photoacid therapy outcome self-report

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Adiabatic geometric phase for a Bose-Einstein condensate coupled to a cavity

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Physical Review A 2011年第5期84卷 053610-053610页

作者： Sheng-Chang Li Li-Bin Fu Jie Liu National Key Laboratory of Science and Technology on Computation Physics 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

We investigate the geometric phase in a model of a Bose-Einstein condensate coupled to an optical cavity in which both the condensate and the cavity are described with coherent states. When the argument of the atom-cavity coupling term varies in time slowly from zero to 2π, we calculate the geometric phase accumulated by the ground state and obtain its analytic expression in explicit form. We find that the adiabatic geometric phase jumps from zero to nontrivial π at a critical value that corresponds to the normal-superradiant phase-transition point. The magneticlike flux interpretation of the geometric phase is also discussed.

关键词： BOSE-Einstein condensation PHASE transformations (physics) COUPLINGS (Gearing) SUPERRADIANCE MOLECULAR emission cavity analysis

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Physical origins of ruled surfaces on the reduced density matrices geometry

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science China(physics,Mechanics & Astronomy) 2017年第2期60卷 1-8页

作者： Ji-Yao Chen Zhengfeng Ji Zheng-Xin Liu Xiaofei Qi Nengkun Yu Bei Zeng Duanlu Zhou State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Perimeter Institute for Theoretical Physics Waterloo N2L 2Y5 Canada Centre for Quantum Computation ＆ Intelligent Systems School of Software Faculty of Engineering and Information Technology University of Technology Sydney Sydney 2007 Australia State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China Department of Physics Renmin University of China Beijing 100872 China Department of Mathematics Shanxi University Taiyuan 030000 China Institute for Quantum Computing University of Waterloo Waterloo N2L 3G1 Canada Department of Mathematics ＆ Statistics University of Guelph Guelph N1G 2W1 Canada Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The reduced density matrices （RDMs） of many-body quantum states form a convex set. The boundary of low dimensional projections of this convex set may exhibit nontrivial geometry such as ruled surfaces. In this paper, we study the physical origins of these ruled surfaces for bosonic systems. The emergence of ruled surfaces was recently proposed as signatures of symmetry- breaking phase. We show that, apart from being signatures of symmetry-brealdng, ruled surfaces can also be the consequence of gapless quantum systems by demonstrating an explicit example in terms of a two-mode Ising model. Our analysis was largely simplified by the quantum de Finetti＇s theorem--in the limit of large system size, these RDMs are the convex set of all the symmetric separable states. To distinguish ruled surfaces originated from gapless systems from those caused by symmetry- breaking, we propose to use the finite size scaling method for the corresponding geometry. This method is then applied to the two-mode XY model, successfully identifying a ruled surface as the consequence of gapless systems.

关键词： ruled surfaces reduced density matrices bosonic system geometry

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Resonant tunneling in disordered borophene nanoribbons with line defects

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npj computational Materials 2022年第1期8卷 1230-1237页

作者： Pei-Jia Hu Si-Xian Wang Xiao-Feng Chen Zeng-Ren Liang Tie-Feng Fang Ai-Min Guo Hui Xu Qing-Feng Sun Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha410083China School of Physical Science and Technology Lanzhou UniversityLanzhou730000China School of Sciences Nantong UniversityNantong226019China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing100871China Collaborative Innovation Center of Quantum Matter Beijing100871China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing100190China

Recently,borophene has attracted extensive interest as the wonder material,showing that line defects(LDs)occur widely at the interface between V_(1/5)and V_(1/6)boron ***,we study theoretically the electron transport through two-terminal disordered borophene nanoribbons(BNRs)with random distribution of *** results indicate that LDs strongly affect the electron transport properties of *** V_(1/5)and V_(1/6)BNRs exhibit metallic behavior without any LD,in agreement with *** in the presence of LDs,the overall electron transport ability is dramatically decreased,but some resonant peaks of conductance quantum are found in the transmission spectrum of any disordered BNR with arbitrary arrangement of *** disordered BNRs exhibit metal-insulator transition with tunable transmission gap in the insulating ***,two evolution phenomena of resonant peaks are revealed for disordered BNRs with different *** results may help for understanding structure-property relationships and designing LD-based nanodevices.

关键词： tunneling boron resonant

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Low Yield of Near-Zero-Momentum Electrons and Partial Atomic Stabilization in Strong-Field Tunneling Ionization

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Physical Review Letters 2012年第9期109卷 093001-093001页

作者： Hong Liu Yunquan Liu Libin Fu Guoguo Xin Difa Ye Jie Liu X. T. He Yudong Yang Xianrong Liu Yongkai Deng Chengyin Wu Qihuang Gong Department of Physics and State Key Laboratory for Mesoscopic Physics Peking University Beijing 100871 China National Key Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics 100088 Beijing China Center for Applied Physics and Technology Peking University 100084 Beijing China School of Science Beijing Institute of Technology Beijing 100081 China Department of Physics Northwest University Xian Shaanxi 710069 China

We measure photoelectron angular distributions of single ionization of krypton and xenon atoms by laser pulses at 1320 nm, 0.2–1.0×1014 W/cm2, and observe that the yield of near-zero-momentum electrons in the strong-field tunneling ionization regime is significantly suppressed. Semiclassical simulations indicate that this local ionization suppression effect can be attributed to a fraction of the tunneled electrons that are released in a certain window of the initial field phase and transverse velocity are ejected into Rydberg elliptical orbits with a frequency much smaller than that of the laser; i.e., the corresponding atoms are stabilized. These electrons with high-lying atomic orbits are thus prevented from ionization, resulting in the substantially reduced near-zero-momentum electron yield. The refined transition between the Rydberg states of the stabilized atoms has implication on the THz radiation from gas targets in strong laser fields.

关键词： ANGULAR momentum (Nuclear physics) ELECTRONS ATOMIC theory TUNNELING (physics) IONIZATION (Atomic physics) ANGULAR distribution (Nuclear physics) SIMULATION methods & models RYDBERG states

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Dynamics of a nonautonomous soliton in a generalized nonlinear Schrödinger equation

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Physical Review E 2011年第6期83卷 066602-066602页

作者： Zhan-Ying Yang Li-Chen Zhao Tao Zhang Xiao-Qiang Feng Rui-Hong Yue Department of Physics Northwest University Xi’an 710069 China Science and Technology Computation Physics Laboratory Institute of Applied Physics and Computational Mathematics Beijing 100088 China Institute of Photonics and Photon-Technology Northwest University Xi’an 710069 China Faculty of Science Ningbo University Ningbo 315211 China

We solve a generalized nonautonomous nonlinear Schrödinger equation analytically by performing the Darboux transformation. The precise expressions of the soliton’s width, peak, and the trajectory of its wave center are investigated analytically, which symbolize the dynamic behavior of a nonautonomous soliton. These expressions can be conveniently and effectively applied to the management of soliton in many fields.

关键词： SOLITONS SCHRODINGER equation physics MATTER -- Properties DARBOUX transformations

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Chirped Bright and Kink Solitons in Nonlinear Optical Fibers with Weak Nonlocality and Cubic-Quantic-Septic Nonlinearity

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Chinese physics Letters 2022年第4期39卷 12-16页

作者： Qin Zhou Yu Zhong Houria Triki Yunzhou Sun Siliu Xu Wenjun Liu Anjan Biswas Research Center of Nonlinear Science School of Mathematical and Physical SciencesWuhan Textile UniversityWuhan 430200China Radiation Physics Laboratory Department of PhysicsFaculty of SciencesBadji Mokhtar UniversityP.O.Box 1223000 AnnabaAlgeria School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Beijing University of Posts and Telecommunications Research Institute Shenzhen 518057China Department of Physics Chemistry and MathematicsAlabama A&M UniversityNormalAL 35762-4900USA Mathematical Modeling and Applied Computation(MMAC)Research Group Department of MathematicsKing Abdulaziz UniversityJeddah 21589Saudi Arabia

This work focuses on chirped solitons in a higher-order nonlinear Schrodinger equation,including cubic-quinticseptic nonlinearity,weak nonlocal nonlinearity,self-frequency shift,and self-steepening *** the first time,analytical bright and kink solitons,as well as their corresponding chirping,are *** influence of septic nonlinearity and weak nonlocality on the dynamical behaviors of those nonlinearly chirped solitons is thoroughly *** findings of the study give an experimental basis for nonlinear-managed solitons in optical fibers.

关键词： effect nonlinearity solitons

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Spectral Broadening of a Single Er3+ Ion in a Si Nanotransistor

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Physical Review Applied 2022年第3期18卷 034018-034018页

作者： Jiliang Yang Jian Wang Wenda Fan Yangbo Zhang Changkui Duan Guangchong Hu Gabriele G. de Boo Brett C. Johnson Jeffrey C. McCallum 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 Hefei 230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales NSW 2052 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University Victoria 3001 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne Victoria 3010 Australia Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

Single rare-earth ions in solids show great potential for quantum applications, including single-photon emission, quantum computing, and high-precision sensing. However, the linewidths of single rare-earth ions are often broadened due to perturbations associated with the detection methods. Identifying the dominant broadening sources is key to reduce the linewidths for practical applications. We report a spectral broadening study on a single Er3+ ion in a Si nanotransistor. The single ion spectra display a Lorentzian lineshape at all light intensities considered. The linewidth remains nearly constant at 32±2 MHz in the low-intensity regime, and shows a monotonic increase with the intensity in the high-intensity regime. The power broadening does not persist over the microsecond time scales considered after resonant excitation. Nor does it depend on the resonant excitation intensity or the Zeeman shift. These observations and temperature-dependent measurements suggest that charge fluctuations are likely to be a dominant broadening source. Laser heating may also contribute to the power broadening. Charge suppression in the Er3+-doped region and coupling Er3+ ions to a confined optical mode could be implemented to reduce the spectral linewidth and to enhance the sensing precision of single Er3+ ions in Si.

关键词： Quantum sensing Quantum dots Rare-earth doped crystals Optical spectroscopy

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Efficient Scheme for Two-Atom Entanglement and Quantum Information Processing in Cavity QED

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Physical Review Letters 2000年第11期85卷 2392-2392页

作者： Shi-Biao Zheng Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China Hefei 230026 People's Republic of China Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 People's Republic of China

A scheme is proposed for the generation of two-atom maximally entangled states and realization of quantum logic gates and teleportation with cavity QED. The scheme does not require the transfer of quantum information between the atoms and cavity. In the scheme the cavity is only virtually excited and thus the requirement on the quality factor of the cavities is greatly loosened.

关键词： .Quantum Information teleportation quantum logic Cavity ion traps

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