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arXiv · 2205.10876

Disorder-driven dissipative quantum criticality as a source of strange metal behavior

M. Grilli·C. Di Castro·G. Seibold·S. Caprara
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Abstract

The strange metal behavior, usually characterized by a linear-in-temperature (T) resistivity, is a still unsolved mystery in solid-state physics. Usually it is associated with the proximity to a quantum critical point (a second order transition at temperature T = 0) focusing on the related divergent order parameter correlation length. Here, we propose a paradigmatic shift, focusing on a divergent characteristic time scale due to a divergent dissipation acting on the fluctuating critical modes, while their correlation length stays finite. To achieve a divergent dissipation, we propose a mechanism based on the coupling between a local order parameter fluctuation and electronic diffusive modes, that accounts both for the linear-in-T resistivity and for the logarithmic specific heat versus temperature ratio C_V/T ~ log(1/T), down to low temperatures.

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M. Grilli, C. Di Castro, G. Seibold, S. Caprara. 2022-05-22. Disorder-driven dissipative quantum criticality as a source of strange metal behavior. https://arxiv.org/abs/2205.10876

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