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Observation of parabolic electron bands on superconductor LaRu2As2

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Chinese physics B 2024年第7期33卷 70-75页

作者：周兴泰李更潘禄禄陈子超李萌时延昊杨海涛高鸿钧 beijing national Center for condensed matter physics and Institute of physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Hefei national laboratory

Ru-based superconductor LaRu2As2has been discovered exhibiting the highest critical temperature of ～ 7.8 K among iron-free transition metal pnictides with the ThCr2Si2-type crystal structure. However, microscopic research on this novel superconducting material is still lacking. Here, we utilize scanning tunneling microscopy/spectroscopy to uncover the superconductivity and surface structure of LaRu2As2. Two distinct terminating surfaces are identified on the cleaved crystals, namely, the As surface and the La surface. Atomic missing line defects are observed on the La surface. Both surfaces exhibit a superconducting gap of ～ 1.0 me V. By employing quasiparticle interference techniques, we observe standing wave patterns near the line defects on the La atomic plane. These patterns are attributed to quasiparticle scattering from two electron type parabolic bands.

关键词： superconductivity line defect quasi-particle scattering electron band

Unconventional phonon spectra and obstructed edge phonon modes

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Science China(physics,Mechanics & Astronomy) 2024年第4期67卷 114-118页

作者： Ruihan Zhang Haohao Sheng Junze Deng Zhong Fang Zhilong Yang Zhijun Wang beijing national laboratory for condensed matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Based on the elementary band representations(EBR),many topologically trivial materials are classified as unconventional ones(obstructed atomic limit),where the EBR decomposition for a set of electronic states is not consistent with atomic valenceelectron band *** the work,we identify that the unconventional nature can also exist in phonon spectra,where the EBR decomposition for a set of well-separated phonon modes is not consistent with atomic vibration band representations(ABR).The unconventionality has two types:typeⅠis on an empty site;and typeⅡis on an atom site with non-atomic vibration *** unconventionality is described by the nonzero real-space invariant at the *** detailed calculations show that the black phosphorus(BP)has the typeⅠunconventional phonon spectrum,while 1H-Mo Se_(2)has the typeⅡone,although their electronic structures are also ***,the obstructed phonon modes are obtained for two types of unconventional phonon spectra.

关键词： unconventional phonon spectra obstructed edge phonon mode typeⅠ&typeⅡunconventionality

Membrane tension evolution and mechanical regulation of melittin-induced membrane poration

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Chinese physics B 2024年第10期33卷 465-475页

作者： Wanting Zhang Rong Xu Wendong Ma Zhao Lin Kai Yang Bing Yuan Center for soft condensed matter physics and Interdisciplinary Research&School of Physical Science and Technology Soochow UniversitySuzhou 215006China Songshan Lake Materials laboratory Dongguan 523808China Biomedicine Discovery Institute Infection&Immunity ProgramMonash UniversityMelbourneAustralia beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Membrane tension plays a crucial role in various fundamental cellular processes,with one notable example being the T cell-mediated elimination of tumor cells through perforin-induced membrane perforation by amplifying cellular ***,the mechanisms governing the regulation of biomolecular activities at the cell interface by membrane tension remain *** this study,we investigated the correlation between membrane tension and poration activity of melittin,a prototypical pore-forming peptide,using dynamic giant unilamellar vesicle leakage assays combined with flickering tension analysis,molecular dynamics simulations,and live cell *** results demonstrate that an increase in membrane tension enhances the activity of melittin,particularly near its critical pore-forming ***,peptide actions such as binding,insertion,and aggregation in the membrane further influence the evolution of membrane *** cell experiments reveal that artificially enhancing membrane tension effectively enhances melittin’s ability to induce pore formation and disrupt membranes,resulting in up to a ten-fold increase in A549 cell mortality when exposed to a concentration of 2.0-μg·mL^(-1)*** findings elucidate the relationship between membrane tension and the mechanism of action as well as pore-forming efficiency of melittin,while providing a practical mechanical approach for regulating functional activity of molecules at the cell-membrane interface.

关键词： membrane tension mechanical regulation membrane poration giant unilamellar vesicle leakage assay

Preparing highly entangled states of nanodiamond rotation and NV center spin

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Chinese physics B 2024年第2期33卷 144-151页

作者：李文亮周端陆 Institute of physics Beijing National Laboratory for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current *** between NV center electron spin and mechanical rotation of the nanodiamond plays a fundamental role in building a quantum network connecting these microscopic and mesoscopic degrees of *** we present a protocol to asymptotically prepare a highly entangled state of the total quantum angular momentum and electron spin by adiabatically boosting the external magnetic field.

关键词： nanodiamond NV center entanglement

Databases of 2D material-substrate interfaces and 2D charged building blocks

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Chinese physics B 2024年第2期33卷 34-38页

作者：邓俊潘金波杜世萱 beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of physics University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory Dongguan 523808China

Discovery of materials using“bottom-up”or“top-down”approach is of great interest in materials *** materials consisting of two-dimensional(2D)building blocks provide a good platform to explore new materials in this *** van der Waals(vdW)layered materials,these building blocks are charge neutral and can be isolated from their bulk phase(top-down),but usually grow on *** ionic layered materials,they are charged and usually cannot exist independently but can serve as motifs to construct new materials(bottom-up).In this paper,we introduce our recently constructed databases for 2D material-substrate interface(2DMSI),and 2D charged building *** 2DMSI database,we systematically build a workflow to predict appropriate substrates and their geometries at substrates,and construct the 2DMSI *** the 2D charged building block database,1208 entries from bulk material database are *** of crystal structure,valence state,source,dimension and so on is provided for each entry with a json *** also show its application in designing and searching for new functional layered *** 2DMSI database,building block database,and designed layered materials are available in Science Data Bank at https://***/10.57760/sciencedb.j00113.00188.

关键词： 2D material-substrate interfaces charged building block database functional-oriented materials design layered materials density functional theory

C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb2

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Chinese physics Letters 2024年第3期41卷 119-125页

作者：李博曾旭涛徐千惠杨帆项俊森钟恒扬邓司浩何伦华徐菊萍殷雯鲁兴业刘慧颖胜献雷金文涛 School of physics Beihang University beijing national laboratory for condensed matter physics and Institute of PhysicsChinese Academy of Sciences Center for Advanced Quantum Studies and Department of physics Beijing Normal University Spallation Neutron Source Science Center Songshan Lake Materials laboratory

Determination of the magnetic structure and confirmation of the presence or absence of inversion （P） and time reversal （Τ） symmetry is imperative for correctly understanding the topological magnetic materials. He... 详细信息

关键词： Density functional theory

Quantum synchronization with correlated baths

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Chinese physics B 2024年第2期33卷 152-157页

作者：李磊王春辉尹洪浩王如泉刘伍明 School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

We study quantum synchronization under the nonequilibrium *** consider a two-qubit XXZ chain coupled independently to their own reservoirs modeled by the collisional *** reservoir particles,initially prepared in a thermal state or a state with coherence,are correlated through a unitary transformation and afterward interact locally with the two quantum *** study the quantum effect of reservoir on synchronous dynamics of *** preparing different reservoir initial states or manipulating the reservoir particles coupling and the temperature gradient,we find that quantum entanglement of reservoir is the key to control quantum synchronization of system qubits.

关键词： quantum synchronization entanglement quantum coherence nonequilibrium reservoir

High-frequency microwave cavity design for high-mass dark matter axion searches

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Chinese physics B 2024年第5期33卷 87-94页

作者：张驰王佳李春光陈石广程航孙亮吴云 beijing national laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials laboratory Dongguan 523808China Hefei national laboratory Hefei 230088China

The haloscope based on the TM_(010)mode cavity is a well-established technique for detecting QCD ***,the method has limitations in detecting high-mass axion due to significant volume loss in the high-frequency *** a higher-order mode cavity can effectively reduce the volume loss of the high-frequency *** rotatable dielectric pieces as a tuning mechanism can compensate for the degradation of the form factor of the higher-order ***,the introduction of dielectric causes additional volume *** address these issues,this paper proposes a novel design scheme by adding a central metal rod to the higher-order mode cavity tuned by dielectrics,which improves the performance of the haloscope due to the increased effective volume of the cavity *** superiority of the novel design is demonstrated by comparing its simulated performance with previous ***,the feasibility of the scheme is verified by the full-wave simulation results of the mechanical design model.

关键词： axion haloscope microwave cavity

Absence of BCS–BEC crossover in FeSe0.45Te0.55 superconductor

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Chinese physics B 2024年第7期33卷 89-96页

作者：贾俊杰谷亚东殷超辉束英杰陈逸雯史聚民张杏陈浩苗泰民任晓琳梁波朱文培蔡能张丰丰张申金杨峰王志敏彭钦军许祖彦毛寒青刘国东任治安赵林周兴江 national laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Technical Institute of physics and Chemistry Chinese Academy of Sciences Songshan Lake Materials laboratory

In iron-based superconductor Fe（Se,Te）, a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state. It is under debate whether this is the evidence on the presence of the BCS–BEC[Bardeen–Cooper–Schrieffer（BCS）, Bose–Einstein condensation（BEC）] crossover in the superconductor. High-resolution laser-based angle-resolved photoemission measurements are carried out on high quality single crystals of FeSe0.45Te0.55superconductor to address the issue. By employing different polarization geometries, we have resolved and isolated the dyz band and the topological surface band, making it possible to study their superconducting behaviors separately. The dyz band alone does not form a flat band-like feature in the superconducting state and the measured dispersion can be well described by the BCS picture. We find that the flat band-like feature is formed from the combination of the dyz band and the topological surface state band in the superconducting state. These results reveal the origin of the flat band-like feature and rule out the presence of BCS-BEC crossover in Fe（Se,Te） superconductor.

关键词： FeSe_(0.45)Te_(0.55) ARPES electronic structure superconducting gap BCS-BEC crossover