A DMFT+CTQMC Investigation of Strange Metallicity in Local Quantum Critical Scenario

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Acharya, Swagata^1 ; Laad, M.S.^2 ; Taraphder, A.^1,3

Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur

721302, India^1

Institute of Mathematical Sciences, Taramani, Chennai

600113, India^2

Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur

721302, India^3

关键词: Continuous-time;    Dynamical mean-field theory;    Low temperatures;    Magnetic fluctuation;    Metallic state;    Periodic Anderson model;    Quantum critical;    Strange metals;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012037/pdf
DOI  :  10.1088/1742-6596/759/1/012037

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

"Strange" metallicity is now a pseudonym for a novel metallic state exhibiting anomalous infra-red (branch-cut) continuum features in one- and two-particle responses. Here, we employ dynamical mean-field theory (DMFT) using low-temperature continuous-time- quantum Monte-Carlo (CTQMC) solver for an extended periodic Anderson model (EPAM) model to investigate unusual magnetic fluctuations in the strange metal. We show how extinction of Landau quasiparticles in the orbital selective Mott phase (OSMP) leads to (i) qualitative explication of strange transport features and (ii) anomalous quantum critical magnetic fluctuations due to critical liquid-like features in dynamical spin fluctuations, in excellent accord with data in some f-electron systems.