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Journal of Central South University 2023年第12期30卷 4138-4148页

作者：刘少波赵勇峰李恒月阳军亮 Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering School of Physics and Electronic ScienceChangsha University of Science and TechnologyChangsha 410114China

层状双金属氢氧化物(LDH)由于具有层状结构、丰富的氧化还原活性中心和金属离子间的协同作用被认为是超级电容器的理想电极之一。然而,低的比电容和较差的循环稳定性极大地限制了它们的规模化应用。本文采用简单的一步水热法在泡沫镍上... 详细信息

层状双金属氢氧化物(LDH)由于具有层状结构、丰富的氧化还原活性中心和金属离子间的协同作用被认为是超级电容器的理想电极之一。然而,低的比电容和较差的循环稳定性极大地限制了它们的规模化应用。本文采用简单的一步水热法在泡沫镍上制备层状镍铝双金属氢氧化物(NiAl-LDH),并通过不同的反应物浓度控制其电荷存储能力。研究发现反应物浓度对NiAl-LDH的形貌、结晶度和负载密度有明显调节作用。优化后的NiAl-LDH(Ni1Al1-LDH)具有丰富氧缺陷的多孔纳米片结构,该结构紧密包覆在高导电性泡沫镍表面,促进了离子和电子的转移,有效提高了Ni离子的氧化还原活性,从而提高了能量储存能力。作为超级电容器电极,Ni1Al1-LDH在电流密度为1 A/g时的比电容为1958.1 F/g。在100 mV/s的扫速下,经过1000次持续充放电循环,电容保持率高达108.7%。

关键词：超级电容器电容层状镍铝双金属氢氧化物多孔纳米片氧缺陷

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Observation of interlayer excitons in trilayer type-Ⅱ transition metal dichalcogenide heterostructures

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Nano Research 2022年第10期15卷 9588-9594页

作者： Biao Wu Haihong Zheng Junnan Ding Yunpeng Wang Zongwen Liu Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University Shenzhen 518057China

Vertically stacked transition metal dichalcogenide(TMD)heterostructures provide an opportunity to explore optoelectronic properties within the two-dimensional *** such structures,spatially indirect interlayer excitons(IXs)can be generated in adjacent layers because of strong Coulomb ***,due to the complexity of the multilayered heterostructure(HS),the capture and study of the IXs in trilayer type-Ⅱ HSs have so far remained ***,we present the observation of the IXs in trilayer type-Ⅱ staggered band alignment of MoS_(2)/MoSe_(2)/WSe_(2) van der Waals(vdW)HSs by photoluminescence(PL)*** central energy of IX is 1.33 eV,and the energy difference between the extracted double peaks is 23 *** confirmed the origin of IX through PL properties and calculations by the density functional theory,we also studied the dependence of the IX emission peak on laser power and ***,the polarization-resolved PL spectra of HS were also investigated,and the maximum polarizability of the emission peak of WSe_(2) reached 11.40%at 6 *** findings offer opportunities for the study of new physical properties of excitons in TMD HSs and therefore are valuable for exploring the potential applications of TMDs in optoelectronic devices.

关键词： transition metal dichalcogenides interlayer exciton type-II band alignment trilayer heterostructure

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Precise control on the crystallization with co-anti-solvents in wide-bandgap perovskite film for efficient perovskite-organic tandem solar cells

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Journal of Central South University 2024年第12期31卷 4328-4337页

作者： ASLAM Fawad LI Heng-yue YANG Fang FENG Erming CHANG Jian-hui DING Yang LIAO Xiang ZAHID Muhammad SADIQ Muhammad Irfan TAHIR Muhammad ZENG Qiang LIU Fang-yang YANG Jun-liang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Metallurgy and Environment Central South UniversityChangsha 410083China

Constructing tandem solar cells(TSCs)is a strategy to enhance the power conversion efficiency(PCE)of single-junction photovoltaic ***,efficient four-terminal(4 T)perovskite-organic TSCs are developed via precise control over the crystallization with co-anti-solvents in wide-bandgap perovskite(FA_(0.8) Cs_(0.2) Pb(I_(0.6) Br_(0.4))_(3),energy gap:1.77 eV)***-quality perovskite films can be achieved by employing a sophisticated co-anti-solvent technique,which effectively enhances the perovskite crystallinity with large grain size and suppresses the nonradiative recombination with pinhole-free *** results demonstrate that co-anti-solvents with a low boiling point polarity and nonpolar solvent contribute to superior performance of *** wide bandgap semi-transparent perovskite solar cell(ST-PSC)fabricated using co-anti-solvent exhibited a remarkable efficiency of 14.52%,and we successfully obtained an efficiency of 22.5%for 4 T perovskite-organic *** findings inspire bright futures that TSCs could facilitate the development of more effective and sustainable solar energy solutions.

关键词： crystallization anti-solvent perovskite solar cells tandem solar cells

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Anisotropic Rabi model with two-photon relaxation

arXiv

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arXiv 2024年

作者： Li, Hui Shi, Jia-Kai Fan, Li-Bao Li, Zi-Min Shu, Chuan-Cun Institute of Quantum Physics Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha410083 China

The interplay of three light-matter interaction processes - rotating and counter-rotating interactions and two-photon relaxation of the light field - is a topic of interest in quantum optics and quantum information processing. In this work, we theoretically investigate the three light-matter interaction processes using the anisotropic Rabi model, which accounts for different strengths of rotating and counter-rotating interactions and the unique occurrence of photon escape exclusively in pairs. By numerically solving the Lindblad master equation, we analyze the excitation-relaxation dynamics and derive a non-Hermitian effective Hamiltonian to gain further physical insights. To explore the individual effects of these interactions, we examine three analytically tractable limits of the effective Hamiltonian. Our analysis reveals that the three competitive light-matter interaction processes exhibit sensitivity to parity, leading to intriguing phenomena in both transient and steady states. Particularly interesting dynamical patterns resembling quantum phase transitions emerge when these three interaction terms compete. This work deepens the understanding of ultrastrong light-matter interaction in open quantum systems and offers valuable insights into cavity-based quantum computations. © 2024, CC BY.

关键词： Quantum optics

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Quantized perfect transmission in graphene nanoribbons with random hollow adsorbates

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Physical Review B 2024年第6期110卷 064201-064201页

作者： Jia-Le Yu Zhe Hou Irfan Hussain Bhat Pei-Jia Hu Jia-Wen Sun Xiao-Feng Chen Ai-Min Guo Qing-Feng Sun Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics School of Physics and Technology School of Physical Science and Technology International Center for Quantum Materials School of Physics Hefei National Laboratory Hefei 230088 China

Impurities exist inevitably in two-dimensional materials as they spontaneously adsorb onto the surface during fabrication, usually exerting detrimental effects on electronic transport. Here, we focus on a special type of impurities that preferentially adsorb onto the hollow regions of graphene nanoribbons (GNRs), and study how they affect the quantum transport in GNRs. Contrary to previous knowledge that random adatoms should localize electrons, the so-called Anderson localization, noteworthy quantized conductance peaks (QCPs) are observed at specific electron energies. These QCPs are remarkably robust against variations in system size, GNR edge, and adatom properties, and they can reappear at identical energies following an arithmetic sequence of device width. Further investigation of the wave function reveals a unique transport mode at each QCP energy which transmits through disordered GNRs reflectionlessly, while all the others become fully Anderson localized, indicating the survival of quantum ballistic transport in the localized regime. Our findings highlight the potential utility of hollow adatoms as a powerful tool to manipulate the conductivity of GNRs, and deepen the understanding of the interplay between impurities and graphene.

关键词： Transport phenomena Graphene Green's function methods Tight-binding model

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Pulse-area theorem for precision control of the rotational motions of a single molecule in a cavity

arXiv

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arXiv 2023年

作者： Fan, Li-Bao Shu, Chuan-Cun Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha410083 China

We perform a combined analytical and numerical investigation to explore how an analytically designed pulse can precisely control the rotational motions of a single-molecular polariton formed by the strong coupling of two low-lying rotational states with a single-mode cavity. To this end, we derive a pulse-area theorem that gives amplitude and phase conditions of the pulses in the frequency domain for driving the polariton from a given initial state to an arbitrary coherent state. The pulse-area theorem is examined for generating the maximum degree of orientation using a pair of pulses. We show that the phase condition can be satisfied by setting the initial phases of the two identically overlapped pulses or by controlling the time delay between pulses for practical applications. © 2023, CC BY.

关键词： Polariton

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Regulation of magnon-phonon coupling by phonon angular momentum in two-dimensional systems

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Physical Review B 2023年第17期108卷 174426-174426页

作者： Qian Wang Shuang Liu Meng-Qiu Long Yun-Peng Wang Hunan Key Laboratory for Super-Microstructure and Ultrafast Process School of Physics Central South University 932 South Lushan Road Changsha 410000 People's Republic of China

The coupling between magnons and phonons modulates the transport properties of magnons, resulting in magnon polarons and magnon Seebeck effects, etc. Magnons possess well-defined angular momentum, while phonons are usually composed of linear atomic oscillations lacking angular momentum. However, in chiral systems, phonons become elliptical or circular; thus they will carry angular momentum. In this paper, we emphasize angular momentum and its role in the magnon-phonon coupling. Using a coupled-magnon-phonon model on the hexagonal lattice, we investigate the coupling of achiral and chiral phonons with three types of magnons, namely a magnon on one sublattice, ferromagnetic magnons, and antiferromagnetic magnons. We calculate the magnon-phonon dispersion relations and the strength of magnon-phonon coupling in the reciprocal space. We are particularly interested in the K and K′ points at the corner of the first Brillouin zone where the normal modes involve circular rotations of magnetization and displacement. We find a selective coupling wherein the coupling between magnons and phonons vanishes either when the magnitude of the magnon or phonon modes is zero or when the circular motion of magnetization is opposite to that of the displacements. These findings pave the way towards manipulating magnon polaron devices based on phonon angular momentum.

关键词： Magnons Spin-phonon coupling Chiral symmetry

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Theoretical investigations on the magneto-Raman effect of CrI3

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Physical Review B 2023年第18期108卷 184414-184414页

作者： Shuang Liu Meng-Qiu Long Yun-Peng Wang School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast Process Central South University 932 South Lushan Road Changsha 410083 People's Republic of China

The magneto-optical property of magnets is used for detecting their magnetization and for information storage applications. The elastic interaction of light with magnetic materials is modulated by the spin-orbital coupling, which is manifested by the rotation of the polarization plane of scattered light with respect to the injected light. The magnetic order also participates in the inelastic Raman scattering of light, as experimentally demonstrated by an ∼40∘ rotation of the polarization plane by the two-dimensional ferromagnet CrI3. In this paper, we investigate the magneto-Raman properties of monolayer CrX3 (X=Cl, Br, and I) using first-principles methods. We calculate the Raman tensor and the Raman intensity due to the A1g phonon by taking the spin-orbit coupling into account. Experimental results on CrI3 are well reproduced. Both the rotation angle of the polarization plane of linearly polarized light and the Raman circular polarization strongly depend on the energy of the injected photons.

关键词： Magneto-optical effect Magnetic semiconductors Density functional calculations

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Polymer-Decorated 2D MoS2 Synaptic Transistors for Biological Bipolar Metaplasticities Emulation

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Chinese Physics Letters 2020年第8期37卷 177-188页

作者： Yuhang Zhao Biao Liu Junliang Yang Jun He Jie Jiang Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Biological bipolar metaplasticities were successfully mimicked in two-dimensional(2D)MoS2 transistors via the implementation of two different MoS2 surface decorations,poly(vinyl alcohol)(PVA)and chitosan ***,the depressing metaplasticity was successfully mimicked when the PVA bio-polymer was used as the surface decoration layer,whereas the metaplasticity of long-term potentiation was realized when the chitosan bio-polymer was taken as the surface decoration ***,the electronic band structures of the 2D MoS2 devices with different surface decorations were further investigated using first-principles calculations for understanding the underlying mechanisms of such bipolar *** results will deepen our understanding of metaplasticity,and have great potential in neuromorphic computing applications.

关键词： MoS2 poly(vinyl plasticity

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Highly stretchable polymer/silver nanowires composite sensor for human health monitoring

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Nano Research 2020年第4期13卷 919-926页

作者： Yanjing Zhang Pei He Meng Luo Xiaowen Xu Guozhang Dai Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Flexible strain sensors exhibit outstanding advantages in terms of sensitivity and stability by detecting changes in physical *** can be easily attached to human skin and clothed to achieve monitoring of human motion and ***,general sensing material shows low stretchability and cannot respond to signals under large *** this work,a highly stretchable polymer composite was developed by adding small amount(0.17 wt.%)of silver nanowires(AgNWs)in stretchable conductive polymer *** conductivity of polymer/AgNWs composite is 1.3 S/m with the stretchability up to 500%.The stretchable strain sensor based on the polymer/AgNWs composite can respond to strain signals in real time,even for 1%strain response,and shows excellent stability over 1,000 loading/unloading ***,the strain sensor can be attached to human skin and clothed to monitor joints,throat and pulse of the human *** human body electrocardiogram(ECG)signal was detected successfully with the polymer/AgNWs electrode,which is comparable to the signal obtained by the commercial ***,the sensors enable monitoring of human movement and *** advantages make it a potential application in wearable devices and electronic skin.

关键词： stretchable sensor silver nanowires health monitoring electrocardiogram

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