Seminar----Institute of Theoretical Physics，Chinese Academy of Sciences

CAS Key Laboratory of Theoretical Physics
Institute of Theoretical Physics
Chinese Academy of Sciences
Seminar
Title 题目	A Strange Metal from Gutzwiller correlations in infinite dimensions : Transverse Transport, Optical Response and Rise of Two Relaxation Rates
Speaker 报告人	Dr. Wenxin Ding
Affiliation 所在单位	Kavli Institute of Theoretical Science, Chinese Academy of Sciences
Date 日期	2017年9月26日（周二）下午3：30
Venue 地点	Room 322, ITP
Abstract 摘要	Using two approaches to strongly correlated systems, the extremely correlated Fermi liquid theory and the dynamical mean field theory, we compute the transverse transport coefficients, namely the Hall constants $R_H$ and Hall angles $\theta_H$, and the longitudinal and transverse optical response of the $U=\infty$ Hubbard model in the limit of infinite dimensions. {We focus} on two {successive} low-temperature regimes, the Gutzwiller correlated Fermi liquid (GCFL) and the Gutzwiller correlated strange metal (GCSM). We find that the Hall angle $\cot \theta_H$ is proportional to $T^2$ in the GCFL regime, while on warming into the GCSM regime it first passes through a downward bend and then continues as $T^2$. Equivalently, $R_H$ is weakly temperature dependent in the GCFL regime, but becomes strongly temperature dependent in the GCSM regime. Drude peaks are found for both the longitudinal optical conductivity $\sigma_{xx}(\omega)$ and the optical Hall angles $\tan \theta_H(\omega)$ below certain characteristic energy scales. By comparing the relaxation rates extracted from fitting to the Drude formula, we find that in the GCFL regime there is a single relaxation rate controlling both longitudinal and transverse transport, while in the GCSM regime two different relaxation rates emerge. We trace the origin of this behavior to the dynamical particle-hole asymmetry of the Dyson self-energy, arguably a generic feature of doped Mott insulators. ref: arXiv:1705.01914 refs of ECFL: Phys. Rev. B 87, 125124 (2013), Annals of Physics 338, 283, (2013), Phys. Rev. B 94, 045138 (2016).
Contact Person 所内联系人	田矗舜