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Seniority and (9/2)^(n) configurations in neutron-rich Nickel isotopes

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Chinese Physics C 2022年第7期46卷 103-111页

作者： S.Sidorov D.Zhulyaeva T.Tretyakova Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Rusia Skobeltsyn Institute of Nuelear Physicso Moscow State University Moscow 119991Rssia

Excited states in low-energy spectra of ^(70-76) Ni are considered. Accordingly, pairing forces in the form of surface delta interaction are employed to account for the formation of the ground state multiplet with seniority v= 2 states. The multiplet splitting is described with mass relationships of masses of neighboring nuclei. Subsequently, the seniority model is adopted to reproduce or predict the states v= 3 in odd-even isotopes and v= 4 in even-even isotopes. The correct account of the 2^(+)_(1) state should allow for the description of the reversed order of J = 4 states with v= 2 and v= 4 observed in experiments. The results obtained are compared with the structure of similar multiplets in N=50 isotones.

关键词： shell model nucleon pairing seniority scheme neutron-rich isotopes

A brief review on/μSR studies of unconventional Fe-and Cr-based superconductors

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Science China(Physics,Mechanics & Astronomy) 2018年第12期61卷 3-24页

作者： A.Bhattacharyya D.T.Adroja M.Smidman V.K.Anand ISIS Facility Rutherford Appleton LaboratoryChiltonDidcot OxonOX11OQXUK Department of Physics Ramakrishna Mission Vivekananda Educational and Research InstituteHowrah 711202India Highly Correlated Matter Research Group Physics DepartmentUniversity of JohannesburgAuckland Park 2006South Africa Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Berlin D-14109Germany

Muon spin relaxation/rotation(μSR) is a vital technique for probing the superconducting gap structure, pairing symmetry and time reversal symmetry breaking, enabling an understanding of the mechanisms behind the unconventional superconductivity of cuprates and Fe-based high-temperature superconductors, which remain a puzzle. Very recently double layered Fe-based superconductors having quasi-2 D crystal structures and Cr-based superconductors with a quasi-1D structure have drawn considerable attention. Here we present a brief review of the characteristics of a few selected Fe-and Cr-based superconducting materials and highlight some of the major outstanding problems, with an emphasis on the superconducting pairing symmetries of these materials. We focus on μSR studies of the newly discovered superconductors ACa_2Fe_4As_4F_2(A = K, Rb, and Cs), ThFeAsN, and A_2Cr_3As_3(A = K, Cs), which were used to determine the superconducting gap structures, the presence of spin fluctuations, and to search for time reversal symmetry breaking in the superconducting states. We also briefly discuss the results of μSR investigations of the superconductivity in hole and electron doped BaFe_2As_2.

关键词： unconventional superconductors iron-based superconductors Cr-based superconductors superconducting pairing symmetry time reversal symmetry muon spin rotation/relaxation

Predicting diamond-like Co-based chalcogenides as unconventional high temperature superconductors

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Science Bulletin 2018年第20期63卷 1338-1344页

作者： Jiangping Hu Yuhao Gu Congcong Le Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Kavli Institute of Theoretical Sciences University of Chinese Academy of SciencesBeijing 1O0190China Collaborative Innovation Center of Quantum Matter Beijing 100049China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsInstitute of Theoretical and Computational ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

We predict Co-based chalcogenides with a diamond-like structure can host unconventional high temperature superconductivity(high-Tc). The essential electronic physics in these materials stems from the Co layers with each layer being formed by vertex-shared CoA_4(A=S, Se, Te) tetrahedra complexes, a material genome proposed recently by us to host potential unconventional high-Tcclose to a d7 filling configuration in 3 d transition metal compounds. We calculate the magnetic ground states of different transition metal compounds with this structure. It is found that(Mn, Fe, Co)-based compounds all have a G-type antiferromagnetic(AFM) insulating ground state while Ni-based compounds are paramagnetic *** AFM interaction is the largest in the Co-based compounds as the three t2 gorbitals all strongly participate in AFM superexchange interactions. The abrupt quenching of the magnetism from the Co to Ni-based compounds is very similar to those from Fe to Co-based pnictides in which a C-type AFM state appears in the Fe-based ones but vanishes in the Co-based ones. This behavior can be considered as an electronic signature of the high-Tcgene. Upon doping, as we predicted before, this family of Co-based compounds favor a strong d-wave pairing superconducting state.

关键词： Iron-based superconductors Cuprates Cobalt chalcogenides d-wave pairing symmetry

Observation of a Ubiquitous(π,π)-Type Nematic Superconducting Order in the Whole Superconducting Dome of Ultra-Thin BaFe_(2-x)Ni_(x)As_(2) Single Crystals

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Chinese Physics Letters 2021年第9期38卷 85-95页

作者： Yu Dong Yangyang Lv Zuyu Xu M.Abdel-Hafiez A.N.Vasiliev Haipeng Zhu Junfeng Wang Liang Li Wanghao Tian Wei Chen Song Bao Jinghui Wang Yueshen Wu Yulong Huang Shiliang Li Jie Yuan Kui Jin Labao Zhang Huabing Wang Shun-Li Yu Jinsheng Wen Jian-Xin Li Jun Li Peiheng Wu School of Electronic Science and Engineering&School of Physics Nanjing UniversityNanjing 210093China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China National University of Science and Technology(MISiS) Moscow 119049Russia Department of Physics and Astronomy Box 516Uppsala UniversityUppsala SE-75120Sweden Moscow State University Moscow 119991Russia Wuhan National High Magnetic Field Center&School of Physics Huazhong University of Science and TechnologyWuhan 430074China ShanghaiTech Laboratory for Topological Physics&School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Beijing National Laboratory for Condensed Matter Physics&Institute of Physics Chinese Academy of SciencesBeijing 100190China Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

In iron-based superconductors,the(0,π) or(π,0) nematicity,which describes an electronic anisotropy with a fourfold symmetry breaking,is well established and believed to be important for understanding the superconducting ***,how exactly such a nematic order observed in the normal state can be related to the superconducting pairing is still ***,by performing angular-dependent in-plane magnetoresistivity using ultra-thin flakes in the steep superconducting transition region,we unveil a nematic superconducting order along the(π,π) direction in electron-doped BaFe_(2-x)Ni_(x)As_(2) from under-doped to heavily overdoped regimes with x=0.065- *** shows superconducting gap maxima along the(π,π) direction rotated by 45° from the nematicity along(0, π) or(π,0) direction observed in the normal state.A similar(π,π)-type nematicity is also observed in the under-doped and optimally doped hole-type Ba1-yKyFe2 As_(2),with y=*** results suggest that the(π,π) nematic superconducting order is a universal feature that needs to be taken into account in the superconducting pairing mechanism in iron-based superconductors.

关键词： pairing (x) Crystal

Characterization of Mass Spectra of Aluminum Anion Clusters Generated by Laser Vaporization and Pulsed Molecular Beam Techniques

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Chinese Physics Letters 1996年第11期13卷 829-832页

作者： NI Guo-quan ZHOU Ru-fang ZHAI Hua-jin WANG Yu-zhu Shanghai Institute of Optics and Fine Mechanics Joint Laboratory for Quantum OpticsChinese Academy of SciencesShanghai 201800

Aluminum anion clusters are generated by laser vaporization and molecular beam *** abundance spectra exhibit a pronounced odd-even alternation for clusters ranging from n=5 to n=17,which is related to the presence of trace oxygen and water resident in He carrier gas and explained by electron pairing *** addition,confirmation of jellium model predictions is revealed at peaked A113-,and for the first time at Al_(7)O^(-).A local maximum Al7-is also observed.

关键词： confirmation pairing Molecular

Efficient Property-Based Remote Attestation Scheme

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China Communications 2012年第10期9卷 1-9页

作者： Zhang Yichen Li Jiguo Sun Chuanming College of Computer and Information Engineering Hohai University Nanjing 210098 P. R. China

In order to ensure the security of the property-based remote attestation scheme, an improved, more efficient, forrml security model of property-based remote attestation is proposed, with which we prove that the user platform satis- fies the security property requirements predefmed by a remote relying party. Under the co-Corrtautational Diffie-Helknan （CDH） assumption, the proposed scheme is proved to be secure in the random oracle model. Compared with the existing schemes, the proposed scheme has a short property certificate and signature size, and requires less computational cost.

关键词： trusted computing remote attestation pairing co-CDH assumption

Ginzburg–Landau Free Energy of Crystalline Color Superconductors:A Matrix Formalism from Solid-State Physics

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Communications in Theoretical Physics 2015年第12期64卷 687-696页

作者：曹高清何联毅 Department of Physics Tsinghua University and Collaborative Innovation Center of Quantum Matter Theoretical Division Los Alamos National Laboratory

The Ginzburg–Landau(GL) free energy of crystalline color superconductors is important for understanding the nature of the phase transition to the normal quark matter and predicting the preferred crystal structure. So far the GL free energy at zero temperature has only been evaluated up to the sixth order in the condensate. To give quantitative reliable predictions we need to evaluate the higher-order terms. In this work,we present a new derivation of the GL free energy by using the discrete Bloch representation of the fermion field. This derivation introduces a simple matrix formalism without any momentum constraint,which may enable us to calculate the GL free energy to arbitrary order by using a computer.

关键词： color superconductors LOFF pairing Ginzburg–Landau

Quantum Double Constructions for Compact Quantum Group

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Acta Mathematica Sinica,English Series 2013年第12期29卷 2273-2282页

作者： Ming LIU Xia ZHANG School of Science TianJin Polytechnic University

For a non-degenerate pair of compact quantum groups, we first construct the quantum double as an algebraic compact quantum group in an algebraic framework. Then by adopting some completion procedure, we give the universal and reduced quantum double constructions in the correspondence C＊-algebraic settings, which generalize Drinfeld＇s quantum double construction and yield new C＊-algebraic compact quantum groups.

关键词： Compact quantum group pairing quantum double Haar state

Difference in moments of inertia and paring interaction strength in superdeformed nuclei

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Science China Mathematics 1997年第6期40卷 652-657页

作者：雷奕安林纯镇曾谨言 Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China Department of Physics Peking University Beijing 100871 China Department of Physics Peking University Beijing 100871 China Also at Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China.

The difference in the bandhead moments of inertia between the superdeformed (SD) band 194Hg(1) and the two-quasiparticle SD bands 194Hg(2,3) was investigated using the particle-number-conserving treatment for the cranked shell model Hamiltonian, and the pairing interaction strength in SD nuclei is estimated to be much weaker than that in normally deformed nuclei.

关键词： super-deformed band difference in moments of inertia particle-number-conserving treatment pairing interaction strength.