arXiv: Strongly Correlated Electrons最新文献_第8页

Hubbard model on the Bethe lattice via variational uniform tree states: Metal-insulator transition and a Fermi liquid 通过变分均匀树态的贝特晶格上的哈伯德模型:金属-绝缘体跃迁和费米液体

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-13 DOI: 10.1103/PHYSREVRESEARCH.3.023054

P. Lunts, A. Georges, E. Stoudenmire, M. Fishman

{"title":"Hubbard model on the Bethe lattice via variational uniform tree states: Metal-insulator transition and a Fermi liquid","authors":"P. Lunts, A. Georges, E. Stoudenmire, M. Fishman","doi":"10.1103/PHYSREVRESEARCH.3.023054","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.023054","url":null,"abstract":"We numerically solve the Hubbard model on the Bethe lattice with finite coordination number $z=3$, and determine its zero-temperature phase diagram. For this purpose, we introduce and develop the `variational uniform tree state' (VUTS) algorithm, a tensor network algorithm which generalizes the variational uniform matrix product state algorithm to tree tensor networks. Our results reveal an antiferromagnetic insulating phase and a paramagnetic metallic phase, separated by a first-order doping-driven metal-insulator transition. We show that the metallic state is a Fermi liquid with coherent quasiparticle excitations for all values of the interaction strength $U$, and we obtain the finite quasiparticle weight $Z$ from the single-particle occupation function of a generalized \"momentum\" variable. We find that $Z$ decreases with increasing $U$, ultimately saturating to a non-zero, doping-dependent value. Our work demonstrates that tensor-network calculations on tree lattices, and the VUTS algorithm in particular, are a platform for obtaining controlled results for phenomena absent in one dimension, such as Fermi liquids, while avoiding computational difficulties associated with tensor networks in two dimensions. We envision that future studies could observe non-Fermi liquids, interaction-driven metal-insulator transitions, and doped spin liquids using this platform.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84592257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

High-pressure synthesis of Ba2RhO4, a rhodate analog of the layered perovskite Sr-ruthenate Ba2RhO4的高压合成，Ba2RhO4是层状钙钛矿Sr-ruthenate的rhodate类似物

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-13 DOI: 10.1103/PHYSREVMATERIALS.5.015001

I. Kurata, J. A. Flores-Livas, H. Sugimoto, H. Takahashi, H. Sagayama, Y. Yamasaki, T. Nomoto, R. Arita, S. Ishiwata

{"title":"High-pressure synthesis of \u0000Ba2RhO4\u0000, a rhodate analog of the layered perovskite Sr-ruthenate","authors":"I. Kurata, J. A. Flores-Livas, H. Sugimoto, H. Takahashi, H. Sagayama, Y. Yamasaki, T. Nomoto, R. Arita, S. Ishiwata","doi":"10.1103/PHYSREVMATERIALS.5.015001","DOIUrl":"https://doi.org/10.1103/PHYSREVMATERIALS.5.015001","url":null,"abstract":"A new layered perovskite-type oxide Ba$_2$RhO$_4$ was synthesized by a high-pressure technique with the support of convex-hull calculations. The crystal and electronic structure were studied by both experimental and computational tools. Structural refinements for powder x-ray diffraction data showed that Ba$_2$RhO$_4$ crystallizes in a K$_2$NiF$_4$-type structure, isostructural to Sr$_2$RuO$_4$ and Ba$_2$IrO$_4$. Magnetic, resistivity, and specific heat measurements for polycrystalline samples of Ba$_2$RhO$_4$ indicate that the system can be characterized as a correlated metal. Despite the close similarity to its Sr$_2$RuO$_4$ counterpart in the electronic specific heat coefficient and the Wilson ratio, Ba$_2$RhO$_4$ shows no signature of superconductivity down to 0.16 K. Whereas the Fermi surface topology has reminiscent pieces of Sr$_2$RuO$_4$, an electron-like e$_g$-($d_{x^2-y^2}$) band descends below the Fermi level, making of this compound unique also as a metallic counterpart of the spin-orbit-coupled Mott insulator Ba$_2$IrO$_4$.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81238659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Anomalous Kerr effect in SrRuO3 thin films SrRuO3薄膜中的反常Kerr效应

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-12 DOI: 10.1103/physrevb.102.140408

F. M. Bartram, Sopheak Sorn, Zhuolu Li, Kyle Hwangbo, S. Shen, F. Frontini, Liqun He, P. Yu, A. Paramekanti, Luyi Yang

引用次数: 7

Pseudo-BCS wave function from density matrix decomposition: Application in auxiliary-field quantum Monte Carlo 密度矩阵分解的伪bcs波函数:在辅助场量子蒙特卡罗中的应用

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-12 DOI: 10.1103/PHYSREVRESEARCH.3.013065

Zhi-Guang Xiao, Hao Shi, Shiwei Zhang

{"title":"Pseudo-BCS wave function from density matrix decomposition: Application in auxiliary-field quantum Monte Carlo","authors":"Zhi-Guang Xiao, Hao Shi, Shiwei Zhang","doi":"10.1103/PHYSREVRESEARCH.3.013065","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013065","url":null,"abstract":"We present a method to construct pseudo-BCS wave functions from the one-body density matrix. The resulting many-body wave function, which can be produced for any fermion systems, including those with purely repulsive interactions, has the form of a number-projected BCS form, or antisymmetrized germinal power (AGP). Such wave functions provide a better ansatz for correlated fermion systems than a single Slater determinant, and often better than a linear combination of Slater determinants (for example from a truncated active space calculation). We describe a procedure to build such a wave function conveniently from a given reduced density matrix of the system, rather than from a mean-field solution (which gives a Slater determinant for repulsive interactions). The pseudo-BCS wave function thus obtained reproduces the density matrix or minimizes the difference between the input and resulting density matrices. One application of the pseudo-BCS wave function is in auxiliary-field quantum Monte Carlo (AFQMC) calculations as the trial wave function to control the sign/phase problem. AFQMC is often among the most accurate general methods for correlated fermion systems. We show that the pseudo-BCS form further reduces the constraint bias and leads to improved accuracy compared to the usual Slater determinant trial wave functions, using the two-dimensional Hubbard model as an example. Furthermore, the pseudo-BCS trial wave function allows a new systematically improvable self-consistent approach, with pseudo-BCS trial wave function iteratively generated by AFQMC via the one-body density matrix.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85314378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Metallic islands in the Kondo insulator SmB6 近藤绝缘体SmB6中的金属岛

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-08 DOI: 10.1103/physrevresearch.2.043181

J. Souza, P. Rosa, J. Sichelschmidt, M. Carlone, P. Venegas, M. O. Malcolms, P. Menegasso, R. Urbano, Z. Fisk, P. G. P. I. D. F. Wataghin, Unicamp, M. Solids, Los Alamos National Laboratory, D. D. F'isica, F. Ciencias, Unesp, Posmat, D. Physics, Astronomy, U. California

{"title":"Metallic islands in the Kondo insulator \u0000SmB6","authors":"J. Souza, P. Rosa, J. Sichelschmidt, M. Carlone, P. Venegas, M. O. Malcolms, P. Menegasso, R. Urbano, Z. Fisk, P. G. P. I. D. F. Wataghin, Unicamp, M. Solids, Los Alamos National Laboratory, D. D. F'isica, F. Ciencias, Unesp, Posmat, D. Physics, Astronomy, U. California","doi":"10.1103/physrevresearch.2.043181","DOIUrl":"https://doi.org/10.1103/physrevresearch.2.043181","url":null,"abstract":"The predicted interplay between Kondo physics and non-trivial topology in SmB$_{6}$ has stimulated many experimental reports, some of which are in apparent contradiction. The origin of the dispute may lie on the fragility of the Kondo insulating phase in the presence of Sm vacancies (Kondo holes) and/or natural impurities, such as Gd$^{3+}$. In this work, we locally investigated this fragility for Al-flux grown Sm$_{1-x}$Gd$_{x}$B$_{6}$ single crystals (0 $leq$ $x$ $leq$ 0.02) by combining electron spin resonance (ESR) and complementary bulk measurements. The Gd$^{3+}$ ESR spectra in a highly dilute regime ($x$ $sim 0.0004$) display the features of an insulating cubic environment. Remarkably, a metallic ESR lineshape is observed for more concentrated samples ($x$ $geq$ 0.004), even though these systems are still in a reasonably dilute regime and show insulating $dc$ electrical resistivity. Our data indicate that the Kondo insulating state is destroyed locally around impurities before a global percolation occurs. This result not only explains the discrepancy between $dc$ and $ac$ conductivity, but also provides a scenario to explain the presence of quantum oscillations in magnetization in the absence of quantum oscillations in electrical resistivity.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"131 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73766315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Photoinduced strange metal with electron and hole quasiparticles 具有电子和空穴准粒子的光致奇异金属

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-08 DOI: 10.1103/PhysRevB.103.L201116

N. Dasari, Jiajun Li, P. Werner, M. Eckstein

引用次数: 2

η-paired superconducting hidden phase in photodoped Mott insulators 光掺杂Mott绝缘体中η对超导隐相

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-07 DOI: 10.1103/physrevb.102.165136

Jiajun Li, D. Golež, P. Werner, M. Eckstein

引用次数: 23

Tuning the crystalline electric field and magnetic anisotropy along the CeCuBi2−xSbx series 沿CeCuBi2−xSbx系列调整晶体电场和磁场各向异性

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-07 DOI: 10.1103/physrevb.102.155129

G. S. Freitas, M. M. Piva, R. Grossi, C. Jesus, J. Souza, D. S. Christovam, N. F. Oliveira, J. Leão, C. Adriano, J. W. Lynn, P. I. O. N. Physics, University of Campinas - Brazil, M. Solids, Dresden - Germany, D. D. F'isica, Universidade Federal de Sergipe - Brazil, I. D. F'isica, Universidade de Sao Paulo - Brazil, Nist Center for Neutron Research, National Institute of Standards, Technology, Maryland Usa

{"title":"Tuning the crystalline electric field and magnetic anisotropy along the \u0000CeCuBi2−xSbx\u0000 series","authors":"G. S. Freitas, M. M. Piva, R. Grossi, C. Jesus, J. Souza, D. S. Christovam, N. F. Oliveira, J. Leão, C. Adriano, J. W. Lynn, P. I. O. N. Physics, University of Campinas - Brazil, M. Solids, Dresden - Germany, D. D. F'isica, Universidade Federal de Sergipe - Brazil, I. D. F'isica, Universidade de Sao Paulo - Brazil, Nist Center for Neutron Research, National Institute of Standards, Technology, Maryland Usa","doi":"10.1103/physrevb.102.155129","DOIUrl":"https://doi.org/10.1103/physrevb.102.155129","url":null,"abstract":"We have performed X-ray powder diffraction, magnetization, electrical resistivity, heat capacity and inelastic neutron scattering (INS) to investigate the physical properties of the intermetallic series of compounds CeCuBi$_{2-x}$Sb$_{x}$. These compounds crystallize in a tetragonal structure with space group $P4/nmm$ and present antiferromagnetic transition temperatures ranging from 3.6 K to 16 K. Remarkably, the magnetization easy axis changes along the series, which is closely related to the variations of the tetragonal crystalline electric field (CEF) parameters. This evolution was analyzed using a mean field model, which included anisotropic nearest-neighbor interactions and the tetragonal CEF Hamiltonian. The CEF parameters were obtained by fitting the magnetic susceptibility data with the constraints given by the INS measurements. Finally, we discuss how this CEF evolution can affect the Kondo physics and the search for a superconducting state in this family.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86215738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Instabilities of quantum critical metals in the limit $N_frightarrow0$ 极限下量子临界金属的不稳定性

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-06 DOI: 10.21468/SCIPOSTPHYS.10.3.067

Petter Saterskog

引用次数: 0

Electronic correlations in the van der Waals ferromagnet Fe3GeTe2 revealed by its charge dynamics 范德华铁磁体Fe3GeTe2电荷动力学揭示的电子相关性

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-06 DOI: 10.1103/physrevb.102.161109

M. Corasaniti, Run Yang, K. Sen, K. Willa, M. Merz, A. Haghighirad, M. L. Tacon, L. Degiorgi

引用次数: 6