Strong non-linear response of strange metals
arxiv(2024)
摘要
Understanding the behavior and properties of strange metals remains an
outstanding challenge in correlated electron systems. Recently, a model of a
quantum critical metal with spatially random couplings to a critical boson
(Patel et al., Science 381, 790 (2023)) has been shown to capture the
linear-in-T resistivity down to zero temperature (T) - one of the universal
experimental signatures of strange metals. In our work we explore the
non-linear transport properties of such a model of strange metal. Uniting the
large-N and Keldysh field theory formalisms, we derive a set of kinetic
equations for the strange metal and use it to compute nonlinear conductivity.
We find that the third-order conductivity is enhanced by a factor of
T_F/T in comparison to a Fermi liquid, resulting in a strong temperature
dependence. This behavior is shown to arise from the strong, non-analytic
energy dependence of scattering rate and self-energies for electrons. We
highlight the role of energy relaxation and electron-boson drag for the
nonlinear responses. Finally, we discuss the potential for nonanalytic
nonlinear electric field (E⃗) response arising at low temperatures. Our
work demonstrates the characteristic features of strange metals in nonlinear
transport, that may allow to gain more insight about their behavior in future
experiments.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要