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Effect of Poly（Ether Urethane） Introduction on the Performance of Polymer Electrolyte for All-Solid-State Dye-Sensitized Solar Cells

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Chinese physics Letters 2009年第12期26卷 240-242页

作者：周艳方向万春方世璧陈申周晓文张敬波林原 CAS Key laboratory of Photochemistry BLMS Institute of Chemistry Chinese Academy of Sciences Beijing 100190 Graduate School of Chinese Academy of Sciences Beijing 100049

The introduction of poly（ether urethane）（PEUR） into polymer electrolyte based on poly（ethylene oxide）, LiI and I2, has significantly increased the ionic conductivity by nearly two orders of magnitudes. An increment of I3- diffusion coefficient is also observed. All-solid-state dye-sensitized solar cells are constructed using the polymer electrolytes. It was found that PEUR incorporation has a beneficial effect on the enhancement of open circuit voltage VOC by shifting the band edge of TiO2 to a negative value. Scanningelectron microscope images indicate the perfect interfacial contact between the TiO2 electrode and the blend electrolyte.

关键词： soft matter liquids and polymers Electronics and devices Biological physics condensed matter: structural mechanical & thermal Chemical physics and physical chemistry

Light-Induced Phonon-Mediated Magnetization in Monolayer MoS_(2)

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中国物理快报:英文版 2023年第7期40卷 80-85页

作者：张圣杰裴昱非胡史奇武娜陈大强廉超孟胜 beijing national laboratory for condensed matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials laboratory Dongguan 523808China Department of physics University of OxfordOxford OX26QAUnited Kingdom Oden Institute for Computational Engineering and Sciences The University of Texas at AustinAustinTexas 78712USA Department of physics The University of Texas at AustinAustinTexas 78712USA

Light-induced ultrafast spin dynamics in materials is of great importance for developments of spintronics and magnetic storage *** progresses include ultrafast demagnetization,magnetic switching,and magnetic phase transitions,while the ultrafast generation of magnetism is hardly ***,a strong lightinduced magnetization(up to 0.86μBper formula unit)is identified in non-magnetic monolayer molybdenum disulfide(MoS_(2)).With the state-of-the-art time-dependent density functional theory simulations,we demonstrate that the out-of-plane magnetization can be induced by circularly polarized laser,where chiral phonons play a vital *** phonons strongly modulate spin-orbital interactions and promote electronic transitions between the two conduction band states,achieving an effective magnetic field~380 *** study provides important insights into the ultrafast magnetization and spin-phonon coupling dynamics,facilitating effective light-controlled valleytronics and magnetism.

关键词： magnetization transitions molybdenum

Pairing symmetry in monolayer of orthorhombic CoSb

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Frontiers of physics 2021年第4期16卷 185-194页

作者： Tian-Zhong Yuan Mu-Yuan Zou Wen-Tao Jin Xin-Yuan Wei Xu-Guang Xu Wei Li State Key laboratory of Surface physics and Department of physics Fudan UniversityShanghai 200433China Key laboratory of Micro-Nano Measurement-Manipulation and physics(Ministry of Education) School of PhysicsBeihang UniversityBeijing 100191China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Ferromagnetism and superconductivity are generally considered to be antagonistic phenomena in condensed matter ***,we theoretically study the interplay between the ferromagnetic and superconducting orders in a recent discovered monolayered CoSb superconductor with an orthorhombic symmetry and net magnetization,and demonstrate the pairing symmetry of CoSb as a candidate of non-unitary superconductor with time-reversal symmetry *** performing the group theory analysis and the first-principles calculations,the superconducting order parameter is suggested to be a triplet pairing with the irreducible representation of 3B2u,which displays intriguing nodal points and non-zero periodic modulation of Cooper pair spin polarization on the Fermi surface *** findings not only provide a significant theoretical insight into the coexistence of superconductivity and ferromagnetism,but also reveal the exotic spin polarized Cooper pairing driven by ferromagnetic spin fluctuations in a triplet superconductor.

关键词： superconductivity ferromagnetism non-unitary pair

Resistivity minimum emerges in Anderson impurity model modified with Sachdev-Ye-Kitaev interaction

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Chinese physics B 2021年第4期30卷 465-474页

作者： Lan Zhang Yin Zhong Hong-Gang Luo School of Physical Science and Technology&Key laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China beijing Computational Science Research Center Beijing 100084China

We investigate a modified Anderson model at the large-N limit,where the Coulomb interaction is replaced by the Sachdev-Ye-Kitaev random *** resistivity of conduction electron ρ_(c) has a minimum value around temperature T^(*),which is similar to the Kondo system,but the impurity electron’s density of state A_(d)(ω) demonstrates no sharp-peak like the Kondo resonance around the Fermi *** provides a counterintuitive example where resistivity minimum exists without Kondo *** impurity electron’s entropy S_(d) and specific heat capacity C_(v) show a crossover from Fermi liquid to a non-Fermi liquid behavior dependent on *** system is a Fermi liquid at T T^(*),and then becomes a Fermi gas at sufficiently high temperatures T>>T^(*).The non-Fermi liquid at the intermediate-T regime does not occur in the standard Anderson *** also make a renormalization group analysis,which confirms the crossover from Fermi liquid to the non-Fermi *** is emphasized that the resistivity minimum emerges in our model when the system behaves as a non-Fermi liquid rather than Fermi liquid,which provides an alternative example showing resistivity minimum in condensed matter physics.

关键词： Anderson model Sachdev-Ye-Kitaev interaction non-Fermi liquid

Compositional study of δ-NbN film by Auger electron microscopy

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Tungsten 2023年第1期5卷 130-135页

作者： Zhao-Xi Chen Peng Dong Yi-Wen Zhang Yi-Lan Jiang Yi-Fan Ding Yue-Shen Wu Jing-Hui Wang Xiang Zhou Jun Li Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech laboratory for Topological physics ShanghaiTech UniversityShanghai 200031China State Key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Wuhan national High Magnetic Field Center Huazhong University of Science&TechnologyWuhan 430074China

The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their ***,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering *** film was characterized using X-ray diffraction(XRD) and atomic force microscopy(AFM).Transport properties were measured to reveal the field dependent superconducting transition *** XRD and electrical measurement show high crystallinity of δ-NbN phase.A homogeneous and smooth surface morphology was measured by *** electron spectroscopy(AES) was applied to analyze the composition along the depth of the *** evolution of Auger peak profile,heights and nitride stoichiometry at the film surface is *** current study provides a more thorough understanding of complex chemical compositions of δ-NbN thin films.

关键词： Superconducting films Magnetron sputtering Auger electron spectroscopy Depth profile Surface oxidation

A classical density functional approach to depletion interaction of Lennard-Jones binary mixtures

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Communications in Theoretical physics 2022年第3期74卷 87-96页

作者： Yue Chen Wei Chen Xiaosong Chen CAS Key laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Systems Science Beijing Normal UniversityBeijing 100875China

In this article,we apply classical density functional theory to investigate the characteristics of depletion interaction in Lennard-Jones(LJ)binary fiuid ***,to confirm the validity of our adopted density functional formalism,we calculate the radial distribution functions using a theoretical approach and compare them with results obtained by molecular dynamics ***,this approach is applied to two colloids immersed in LJ solvent *** investigate the variation of depletion interaction with respect to the distance of two colloids in LJ binary *** find that depletion interaction may be attractive or repulsive,mostly depending on the bulk density of the solvent and the temperature of the binary *** high bulk densities,the repulsive barrier of depletion force is remarkable when the total excluded volume of colloids touches each other and reaches a *** height of the repulsive barrier is related to the parameters of the LJ potential and bulk ***,the depletion force may exhibit attractive wells if the bulk density of the solvent is *** attractive well tends to appear when the surface-surface distance of colloids is half of the size of the polymer and deepens with temperature lowering in a fixed bulk *** contrast with the hard-sphere system,no oscillation of depletion potential around zero is observed.

关键词： molecular simulation density functional theory depletion interaction soft matter physics colloid-polymer mixtures

Room-Temperature Continuous-Wave Operation of InGaN-Based Blue-Violet Laser Diodes with a Lifetime of 15.6 Hours

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Chinese physics Letters 2010年第11期27卷 129-132页

作者：曾畅张书明季莲王怀兵赵德刚朱建军刘宗顺江德生曹青种明段俐宏王海史永生刘素英杨辉陈良惠 State Key laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences PO Box 912 Beijing 100083 Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Suzhou 215123 Nano-Optoelectronics laboratory Institute of Semiconductors Chinese Academy of Sciences PO BOX 912 Beijing 100083

We report our recent progress of investigations on InGaN-based blue-violet laser diodes （LDs）. The roomtemperature （RT） cw operation lifetime of LDs has extended to longer than 15.6 h. The LD structure was grown on a c-plane free-standing （FS） GaN substrate by metal organic chemical vapor deposition （MOCVD）. The typical threshold current and voltage of LD under RT cw operation are 78 mA and 6.8 V, respectively. The experimental analysis of degradation of LD performances suggests that after aging treatment, the increase of series resistance and threshold current can be mainly attributed to the deterioration of p-type ohmic contact and the decrease of internal quantum efticiency of multiple quantum well （MQW）, respectively.

关键词： Surfaces interfaces and thin films Optics quantum optics and lasers condensed matter: structural mechanical & thermal

Cellular Response to Irradiation

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Communications in Theoretical physics 2011年第5期55卷 921-924页

作者：刘波晏世伟 The Key laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal University

To explore the nonlinear activities of the cellular signaling system composed of one transcriptional arm and one protein-interaction arm, we use an irradiation-response module to study the dynamics of stochastic interactions. It is shown that the oscillatory behavior could be described in a unified way when the radiation-derived signal and noise are incorporated.

关键词： irradiation soft condensed matter cellular response

Magnetic-field modulation of topological electronic state and emergent magneto-transport in a magnetic Weyl semimetal

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The Innovation 2023年第2期4卷 78-82,77页

作者： Jianlei Shen Jiacheng Gao Changjiang Yi Meng Li Shen Zhang Jinying Yang Binbin Wang Min Zhou Rongjin Huang Hongxiang Wei Haitao Yang Youguo Shi Xiaohong Xu Hong-Jun Gao Baogen Shen Geng Li Zhijun Wang Enke Liu beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education&Research Institute of Materials Science Shanxi Normal UniversityTaiyuan 030000China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Key laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Songshan Lake Materials laboratory Dongguan 523808China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingboZhejiang 315201China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhouJiangxi 341000China

The modulation of topological electronic state by an external magnetic field is highly desired for condensed-matter *** to achieve this have been proposed theoretically,but few can be realized ***,combining transverse transport,theoretical calculations,and scanning tunneling microscopy/spectroscopy(STM/S)investigations,we provide an observation that the topological electronic state,accompanied by an emergent magneto-transport phenomenon,was modulated by applying magnetic field through induced non-collinear magnetism in the magnetic Weyl semimetal EuB6.A giant unconventional anomalous Hall effect(UAHE)is found during the magnetization re-orientation from easy axes to hard ones in magnetic field,with a UAHE peak around the low field of 5 kOe.

关键词： topological electronic state