The strange metal behavior, usually characterized by a linear-in-temperature (T) resistivity, is a still unsolved mystery in solid-state physics. It is often associated with the proximity to a quantum critical point (a second order transition at temperature T=0, leading to a broken symmetry phase) 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 electron density 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.
Dissipative quantum criticality as a source of strange metal behavior / Grilli, Marco; DI CASTRO, Carlo; Mirarchi, Giovanni; Seibold, GOTZ ULRICH; Caprara, Sergio. - In: SYMMETRY. - ISSN 2073-8994. - 15:3(2023). [10.3390/sym15030569]
Dissipative quantum criticality as a source of strange metal behavior
Marco Grilli;Carlo Di Castro;Giovanni Mirarchi;Gotz Seibold;Sergio Caprara
2023
Abstract
The strange metal behavior, usually characterized by a linear-in-temperature (T) resistivity, is a still unsolved mystery in solid-state physics. It is often associated with the proximity to a quantum critical point (a second order transition at temperature T=0, leading to a broken symmetry phase) 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 electron density 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.File | Dimensione | Formato | |
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