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Interaction between Potassium Phosphate Buffer Solution and Modeling Cell Membrane Investigated by Sum Frequency Generation Vibrational Spectroscopy

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Chinese Journal of Chemical physics 2015年第4期28卷 -页

作者： Weilai Yang Kangzhen Tian Shuji Ye Hefei National Laboratory for Physical sciences at the Microscale and Department of Chemical physics and Synergetic Innovation center of quantum Information and quantum physics University of Science and Technology of China Hefei 230026 China

Potassium phosphate buffer solution has been widely used in the biological experiments, which represents an important process of the interaction between ions and biomolecules, yet the influences of potassium phosphate on biomolecules such as the cell membrane are still poorly understood at the molecular level. In this work, we have applied sum frequency generation vibrational spectroscopy and carried out a detailed study on the interaction between potassium phosphate buffer solution (PBS) and negative 1,2-dimyristoyl-d54-sn-glycero-3-[phospho-rac-(1-glycerol)] (d54-DMPG) lipid bilayer in real time. The PBS-induced dynamic change in the molecular structure of d54-DMPG lipid bilayer was monitored using the spectral features of CD2, CD3, lipid head phosphate, and carbonyl groups for the first time. It is found that K+ can bind to the cell membrane and cause the signal change of CD2, CD3, lipid head phosphate, and carbonyl groups quickly. Potassium PBS interacts with lipid bilayers most likely by formation of toroidal pores inside the bilayer matrix. This result can provide a molecular basis for the interpretation of the effect of PBS on the ion-assisted transport of protein across the membrane.

关键词： Sum frequency generation Potassium phosphate buffer Lipid bilayer Toroidal pore Interaction

Exact solution of Heisenberg model with site-dependent exchange couplings and Dzyloshinsky–Moriya interaction

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Chinese physics B 2015年第10期24卷 460-466页

作者：杨丽君曹俊鹏杨文力 Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of Sciences Collaborative Innovation center of quantum Matter Institute of Modern physics Northwest University Beijing center for Mathematics and Information Interdisciplinary sciences

We propose an integrable spin-1/2 Heisenberg model where the exchange couplings and Dzyloshinky-Moriya interactions are dependent on the sites. By employing the quantum inverse scattering method, we obtain the eigenvalues and the Bethe ansatz equation of the system with the periodic boundary condition. Furthermore, we obtain the exact solution and study the boundary effect of the system with the anti-periodic boundary condition via the off-diagonal Bethe ansatz. The operator identities of the transfer matrix at the inhomogeneous points are proved at the operator level. We construct the T -Q relation based on them. From which, we obtain the energy spectrum of the system. The corresponding eigenstates are also constructed. We find an interesting coherence state that is induced by the topological boundary.

关键词： Bethe ansatz Yang-Baxter equation T-Q relation

Superconductivity of a cuprate with compressed local octahedron

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Science China(physics,Mechanics & Astronomy) 2019年第3期62卷 111-113页

作者： WenMin Li LiPeng Cao JianFa Zhao XianCheng Wang RunZe Yu YouWen Long QingQing Liu ChangQing Jin Institute of physics Chinese Academy of Sciences School of physics University of Chinese Academy of Sciences Collaborative Innovation center of quantum Matter

Since the historical discovery of high Tc superconductivity(HTS)of La2CuO4 in 1986[1],the superconductivity me chanism of copper oxides remains one of the biggest mysteries in the field of condensed matter physics[2-10].High-Tc cuprates crystallize into layered perovskite structure,as well as copper oxygen octahedron *** octahedron symmetry,the 3d orbitals of Cu^2+with a 3d^9 configuration degenerate into two top eg and three lower t2g orbitals.

关键词： Superconductivity cuprate compressed local octahedron

Compressed Sensing quantum State Tomography Assisted by Adaptive Design

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Chinese physics Letters 2018年第7期35卷 11-14页

作者：殷琪项国勇李传锋郭光灿 Key Laboratory of quantum Information University of Science and Technology of ChinaChinese Academy of Sciences Synergetic Innovation center of quantum Information and quantum physics University of Science and Technology of China Chinese Academy of Sciences

The recently proposed compressed sensing（CS） method sheds light on quantum state tomography of multi-qubit systems with low rank, which greatly reduces the complexity of measurement and computation. However, the restricted isometry property requirement of CS is difficult to be promised or verified in practice, which makes this method probably assign unreasonable results. In regard to this problem, we adopt a two-step procedure and implement an adaptive strategy to update measurement operators based on the measurement results of the first step for CS, which not only serves as a way to verify the estimate but also improves the accuracy of *** numerical simulations manifest that our adaptive protocol can reduce about half of the infidelity of nonadaptive protocol and is still efficient even when the rank of the state is slightly high, which would greatly benefit multi-qubit state tomography in future experiments.

关键词： Compressed sensing

Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3（001） via metallic δ-doping

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National Science Review 2024年第03期11卷 119-127页

作者： Xiaotong Jiao Wenfeng Dong Mingxia Shi Heng Wang Cui Ding Zhongxu Wei Guanming Gong Yanan Li Yuanzhao Li Binjie Zuo Jian Wang Ding Zhang Minghu Pan Lili Wang Qi-Kun Xue State Key Laboratory of Low-Dimensional quantum physics Department of Physics Tsinghua University School of physics&Information Technology Shaanxi Normal University Beijing Academy of quantum Information sciences Department of physics Southern University of Science and Technology International center for quantum Materials School of Physics Peking University Department of physics The Pennsylvania State University Collaborative Innovation center of quantum Matter Hefei National Laboratory

Superconductivity transition temperature（Tc） marks the inception of a macroscopic quantum phase-coherent paired state in fermionic systems. For 2D superconductivity, the paired electrons condense into a coherent superfluid state at Tc, which is usually lower than the pairing temperature, between which intrinsic physics including Berezinskii–Kosterlitz–Thouless transition and pseudogap state are hotly debated. In the case of monolayer FeSe superconducting films on SrTiO3（001）, although the pairing temperature（Tp） is revealed to be 65–83 K by using spectroscopy characterization, the measured zero-resistance temperature（Tc0） is limited to 20 K. Here, we report significantly enhanced superconductivity in monolayer FeSe films by δ-doping of Eu or Al on SrTiO3（001） surface, in which Tc0is enhanced by 12 K with a narrowed transition width ΔTc～8 K, compared with non-doped samples. Using scanning tunneling microscopy/spectroscopy measurements, we demonstrate lowered work function of the δ-doped SrTiO3（001） surface and enlarged superconducting gaps in the monolayer FeSe with improved morphology/electronic homogeneity. Our work provides a practical route to enhance 2D superconductivity by using interface engineering.

关键词： monolayer FeSe interface superconductivity δ-doping zero-resistance temperature superconductivity transition temperature

Anomalous Hall effect in ferromagnetic Weyl semimetal candidate Zr1-x VxCo1.6Sn

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Chinese physics B 2020年第7期29卷 204-210页

作者： Guangqiang Wang Zhanghao Sun Xinyu Si Shuang Jia International center for quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation center of quantum Matter Beijing 100871China CAS center for Excellence in Topological quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of quantum Information sciences Beijing 100193

We grew single crystals of vanadium-substituted,ferromagnetic Weyl semimetal candidate Zr1-xVxCo1.6Sn from molten tin *** solid solutions all crystallize in a full Heusler structure(L21)while their Curie temperatures and magnetic moments are enhanced by *** resistivity gradually changes from bad-metal-like to semiconductor-like with increasing x while the anomalous Hall effect(AHE),which can be well fitted by Tian-Ye-Jin(TYJ)scaling,[1]is also ***,we find an apparent electron-electron interaction(EEI)induced quantum correction in resistivity at low *** anomalous Hall conductivity(AHC)dominated by the intrinsic term is not corrected.

关键词： anomalous Hall effect ferromagnetic Weyl semimetal full Heusler electron-electron interaction

Quantifying Spontaneously Symmetry Breaking of quantum Many-Body Systems

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Communications in Theoretical physics 2017年第10期67卷 405-411页

作者：董国慧房一楠孙昌璞 Beijing Computational Science Research center Synergetic Innovation center of quantum Information and quantum physics University of Science and Technology of China CAS Key Laboratory of Theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences and University of the Chinese Academy of Sciences

Spontaneous symmetry breaking is related to the appearance of emergent phenomena, while a non-vanishing order parameter has been viewed as the sign of turning into such symmetry-breaking phase. We study the spontaneous symmetry breaking in the conventional superconductor and Bose–Einstein condensation with a continuous measure of symmetry by showing that both the many-body systems can be mapped into the many spin model. We also formulate the underlying relation between the spontaneous symmetry breaking and the order parameter quantitatively. The degree of symmetry stays unity in the absence of the two emergent phenomena, while decreases exponentially at the appearance of the order parameter which indicates the inextricable relation between the spontaneous symmetry and the order parameter.

关键词： spontaneous symmetry breaking Bose-Einstein condensation superconductor group theory

Electron Spin Decoherence of Nitrogen-Vacancy center Coupled to Multiple Spin Baths

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Chinese physics Letters 2016年第10期33卷 112-115页

作者：邢健常彦春王宁刘刚钦潘新宇 Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of Sciences Collaborative Innovation center of quantum Matter

We present the experimental results of nitrogen-vacancy （NV） electron spin decoherence, which are linked to the coexistence of electron spin bath of nitrogen impurity （PI center） and 13C nuclear spin bath. In previous works, only one dominant decoherence source is studied： P1 electron spin bath for type-Ⅰb diamond; or 13C nuclear spin bath for type-Ⅱa diamond. In general, the thermal fluctuation from both spin baths can be eliminated by the Hahn echo sequence, resulting in a long coherence time （T2 ） of about 400#8. However, in a high-purity type-Ⅱa diamond where 1℃ nuclear spin bath is the dominant decoherence source, dramatic decreases of NV electron spin T2 time caused by P1 electron spin bath are observed under certain magnetic field. We further apply the engineered Hahn echo sequence to confirm the decoherenee mechanism of multiple spin baths and quantitatively estimate the contribution of P1 electron spin bath. Our results are helpful to understand the NV decoherence mechanisms, which will benefit quantum computing and quantum metrology.

关键词： of on it in Electron Spin Decoherence of Nitrogen-Vacancy center Coupled to Multiple Spin Baths is

Correlation-enhanced electron-phonon coupling for accurate evaluation of the superconducting transition temperature in bulk FeSe

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Science China(physics,Mechanics & Astronomy) 2022年第6期65卷 131-136页

作者： Wenjun Ding Yilin Wang Tong Wei Jiaqing Gao Ping Cui Zhenyu Zhang International center for quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at the Microscaleand CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

It has been widely recognized that,based on standard density functional theory calculations of the electron-phonon coupling,the superconducting transition temperature(T_(c))in bulk FeSe is exceptionally low(almost 0 K)within the Bardeen-Cooper-Schrieffer *** the experimentally observed T_(c)is much higher(∼10 K),and the underlying physical origin remains to be fully explored,especially at the quantitative *** we present the first accurate determination of T_(c)in FeSe where the correlation-enhanced electron-phonon coupling is treated within first-principles dynamical mean-field *** studies treat both the multiple electronic bands across the Fermi level and phononic bands,and reveal that all the optical phonon modes are effectively coupled with the conduction electrons,including the important contributions of a single breathing mode as established by previ-ous ***,each of those phonon modes contributes pronouncedly to the electron pairing,and the resultant T_(c)is drastically enhanced to the experimentally observed *** approach developed here should be broadly applicable to other superconducting systems where correlation-enhanced electron-phonon coupling plays an important role.

关键词： bulk FeSe superconductivity correlation-enhanced electron-phonon coupling density functional theory dynamical mean-field theory