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Research 2024年第1期2023卷 271-280页

作者： Qing Xia Rui Liu Xueqin Chen Zixuan Chen Jun-Jie Zhu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023P.R.China Shenzhen Research Institute of Nanjing University Shenzhen 518000P.R.China

Metal nanomaterials can facilitate microbial extracellular electron transfer(EET)in the electrochemically active biofilm.However,the role of nanomaterials/bacteria interaction in this process is still unclear.Here,we reported the single-cell voltammetric imaging of Shewanella oneidensis MR-1 at the single-cell level to elucidate the metal-enhanced EET mechanism in vivo by the fermi level-responsive graphene electrode.Quantified oxidation currents of~20 fA were observed from single native cells and gold nanoparticle(AuNP)-coated cells in linear sweep voltammetry analysis.On the contrary,the oxidation potential was reduced by up to 100 mV after AuNP modification.It revealed the mechanism of AuNP-catalyzed direct EET decreasing the oxidation barrier between the outer membrane cytochromes and the electrode.Our method offered a promising strategy to understand the nanomaterials/bacteria interaction and guide the rational construction of EET-related microbial fuel cells.

关键词： fermi voltammetry Electron

Universal fermi velocity in highly compressed hydride superconductors

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Matter and Radiation at Extremes 2022年第5期7卷 71-78页

作者： Evgeny F.Talantsev M.N.Miheev Institute of Metal Physics Ural BranchRussian Academy of Sciences18S.Kovalevskoy St.Ekaterinburg 620108Russia and NANOTECH CentreUral Federal University19 Mira St.Ekaterinburg 620002Russia

The fermi velocity vF is one of the primary characteristics of any conductor,including any superconductor.For conductors at ambient pressure,several experimental techniques have been developed to measure vF,and,for instance,Zhou et al.[Nature 423,398(2003)]reported that high-Tc cuprates exhibited a universal nodal fermi velocity vF,univ=(2.7±0.5)×10^(5) m/s.However,there have been no measurements of vF in highly compressed near-room-temperature superconductors(NRTS),owing to experimental challenges.Here,to answer the question of the existence of a universal fermi velocity in NRTS materials,we analyze the full inventory of data on the ground-state upper critical field Bc2(0)for these materials and find that this class of superconductors exhibits a universal fermi velocity vF,univ=(1/1.3)×[2Δ(0)/kBTc]×10^(5) m/s,whereΔ(0)is the ground-state amplitude of the energy gap.The ratio 2Δ(0)/kBTc varies within a narrow range 3.2≤2Δ(0)/kBTc≤5,and so vF,univ in NRTS materials lies in the range 2.5×10^(5) m/s≤vF,univ≤3.8×10^(5) m/s,which is similar to the range of values found for the high-Tc cuprate counterparts of these materials.

关键词： materials. fermi superconductors

High-performance non-fermi-liquid metallic thermoelectric materials

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npj Computational Materials 2023年第1期9卷 1943-1949页

作者： Zirui Dong Yubo Zhang Jun Luo Ying Jiang Zhiyang Yu Nan Zhao Liusuo Wu Yurong Ruan Fang Zhang Kai Guo Jiye Zhang Wenqing Zhang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering Department of Physicsand Shenzhen Institute for Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices and Guangdong Provincial Key Lab for Computational Science and Materials DesignSouthern University of Science and TechnologyShenzhen 518055China Materials Genome Institute Shanghai UniversityShanghai 200444China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

Searching for high-performance thermoelectric(TE)materials in the paradigm of narrow-bandgap semiconductors is hampered by a bottleneck.Here we report on the discovery of metallic compounds,TiFe_(x)Cu_(2x−1)Sb and TiFe1.33Sb,showing the thermopower exceeding many TE semiconductors and the dimensionless figure of merits zTs comparable with the state-of-the-art TE materials.A quasi-linear temperature(T)dependent electrical resistivity in 2–700 K and the logarithmic T-dependent electronic specific heat at low temperature coexist with the high thermopower,highlighting the strong intercoupling of the non-fermi-liquid(NFL)quantum critical behavior of electrons with TE transports.Electronic structure analysis reveals a competition between the antiferromagnetic(AFM)ordering and Kondo-like spin compensation as well as a parallel two-channel Kondo effect.The T-dependent magnetic susceptibility agrees with the quantum critical scenario of strong local correlation.Our work demonstrates the correlation among high TE performance,NFL quantum criticality,and magnetic fluctuation,which opens up directions for future research.

关键词： materials metallic fermi

New type of double‑slit interference experiment at fermi scale

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Nuclear Science and Techniques 2023年第1期34卷 175-177页

作者： Yu‑Gang Ma Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

A new approach that using polarized photon–gluon collisions reported by STAR Collaboration is used to do tomography of the ultrarelativistic nucleus.The collision can be treated as a double-slit experiment at fermi s... 详细信息

关键词： fermi double radius

Photonic topological fermi nodal disk in non-Hermitian magnetic plasma

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Light(Science & Applications) 2020年第1期9卷 1631-1638页

作者： Wenhui Wang Wenlong Gao Leifeng Cao Yuanjiang Xiang Shuang Zhang International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of Education Institute of Microscale Optoelectronics(IMO)Shenzhen University518060 ShenzhenChina School of Physics&Astronomy University of BirminghamBirmingham B152TTUK National Key Laboratory for Laser Fusion Research Centre of Laser FusionCAEP621900 MianyangChina School of Physics and Electronics Hunan University410082 ChangshaChina

Topological physics mainly arises as a necessary link between properties of the bulk and the appearance of surface states,and has led to successful discoveries of novel topological surface states in Chern insulators,topological insulators,and topological fermi arcs in Weyl,Dirac,and Nodal line semimetals owing to their nontrivial bulk topology.In particular,topological phases in non-Hermitian systems have attracted growing interests in recent years.In this work,we predict the emergence of the topologically stable nodal disks where the real part of the eigen frequency is degenerate between two bands in non-ideal magnetohydrodynamics plasma with collision and viscosity dissipations.Each nodal disk possesses continuously distributed topological surface charge density that integrates to unity.It is found that the lossy fermi arcs at the interface connect to the middle of the projection of the nodal disks.We further show that the emergence,coalescence,and annihilation of the nodal disks can be controlled by plasma parameters and dissipation terms.Our findings contribute to understanding of the linear theory of bulk and surface wave dispersions of non-ideal warm magnetic plasmas from the perspective of topological physics.

关键词： topological nodal fermi

fermi Surface and Band Structure of(Ca,La)FeAs2 Superconductor from Angle-Resolved Photoemission Spectroscopy

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Chinese Physics Letters 2013年第12期30卷 139-143页

作者：刘旭刘德发赵林郭琦穆青隔陈东云沈兵伊合绵黄建伟何俊峰彭莹莹刘艳何少龙刘国东董晓莉张君陈创天许祖彦任治安周兴江 National Laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190 Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190

The(Ca,R)FeAs_(2)(R=La,Pr,etc.)superconductors with a signature of superconductivity transition above 40 K possess a new kind of block layers that consist of zig-zag As chains.We report the electronic structure of the new(Ca,La)FeAs_(2)superconductor investigated by both band structure calculations and high resolution angle-resolved photoemission spectroscopy measurements.Band structure calculations indicate that there are four hole-like bands around the zone centerΓ(0,0)and two electron-like bands near the zone corner M(π,π)in CaFeAs_(2).In our angle-resolved photoemission measurements on(Ca0.9La0.1)FeAs_(2),we have observed three hole-like bands around theΓpoint and one electron-like fermi surface near the M(π,π)point.These results provide important information to compare and contrast with the electronic structure of other iron-based compounds in understanding the superconductivity mechanism in the iron-based superconductors.

关键词： fermi bands superconductivity

fermi γ-Ray Pulsars: Spectral and Generation Order Parameters

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Chinese Physics Letters 2011年第8期28卷 356-359页

作者：蔡炎 A.Taani 王伟赵永恒张承民 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

We examine the theory of generation order parameters.Three kinds of generation order parameters are introduced,which describe the production of high-energyγphotons in a cascade process scenario.We find a correlation between the average power−law photon indexΓand spin−down rate.P in 38 common fermiγ−ray pulsars,and find that the third generation order parameter,which implies that the magnetic field may have the most significant effect on the high-energyγphoton absorption in the cascade processes,is the best one.The statistical work shows that the theory of generation order parameters can be applied to describe the theγ-ray pulsar radiation mechanisms in the cascade processes.

关键词： scenario fermi theory

fermi-Decay Law of Bose-Einstein Condensate Trapped in an Anharmonic Potential

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Chinese Physics Letters 2012年第4期29卷 19-22页

作者：刘渊贾亚飞李卫东 Institute of Theoretical Physics and Department of Physics Shanxi UniversityTaiyuan 030006

The fermi-decay law of Bose Einstein condensate,which is trapped by a cigar-shaped anharmonic trap and subjected to a weak random perturbation,is investigated by numerically calculating quantum fidelity (Loschmidt echo),to reveal the coherence loss of the condensate.We find that there are three indispensable factors,anharmonic trap,weak random perturbation and nonlinear interaction,in charging of the fermi-decay law.The anharmonic trap creates anharmonic oscillations,and the weak random perturbation causes coherence loss by disturbing their coherent oscillations,while the nonlinear interaction enhances the loss to the fermi-decay law.Based on the fermi-decay law,some suggestions are presented to prolong the coherent time during coherently manipulating condensates.

关键词： harmonic fermi coherent

Unusual Destruction and Enhancement of Superfluidity of Atomic fermi Gases by Population Imbalance in a One-Dimensional Optical Lattice

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Chinese Physics Letters 2020年第5期37卷 42-46页

作者：陈启瑾王继标孙琳余祎 Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern PhysicsUniversity of Science and Technology of ChinaShanghai 201315 Department of Physics and Zhejiang Institute of Modern Physics Zhejiang UniversityHangzhou 310027 Synergetic Innovation Center of Quantum Information and Quantum Physics Hefei 230026 Laboratory of Quantum Engineering and Quantum Metrology School of Physics and AstronomySun Yat-Sen University(Zhuhai Campus)Zhuhai 519082 College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014

We study the superfluid behavior of a population imbalanced ultracold atomic fermi gases with a short range attractive interaction in a one-dimensional(1D)optical lattice,using a pairing fluctuation theory.We show that,besides widespread pseudogap phenomena and intermediate temperature superfluidity,the superfluid phase is readily destroyed except in a limited region of the parameter space.We find a new mechanism for pair hopping,assisted by the excessive majority fermions,in the presence of continuum-lattice mixing,which leads to an unusual constant Bose-Einstein condensate(BEC)asymptote for Tc that is independent of pairing strength.In result,on the BEC side of unitarity,superfluidity,when it exists,may be strongly enhanced by population imbalance.

关键词： theory. fermi usual

Third-Order Magnetic Susceptibility of an Ideal fermi Gas

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Communications in Theoretical Physics 2018年第11期69卷 619-624页

作者：赖龙泉李照余亚斌刘全慧 School for Theoretical Physics School of Physics and Electronics Hunan University

At low temperature and under weak magnetic field, non-interacting fermi gases reveal both Pauli paramagnetism and Landau diamagnetism, and the magnitude of the diamagnetic susceptibility is 1/3 of that of the paramagnetic one. When the temperature is finite and the magnetic field is also finite, we demonstrate that the paramagnetism and diamagnetism start to deviate from the ratio 1/3. For understanding the magnetic properties of an ideal fermi gas at quite low temperature and under quite weak magnetic field, we work out explicitly the third-order magnetic susceptibility in three cases, from intrinsic spin, orbital motion and in total. An interesting property is in third-order magnetic susceptibilities: when viewing individually, they are both diamagnetic, but in total it is paramagnetic.

关键词： fermi gas third-order magnetic susceptibility Pauli paramagnetism Landau diamagnetism