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Article Dans Une Revue Nature Communications Année : 2023

Correlated insulator collapse due to quantum avalanche via in-gap ladder states

Résumé

The significant discrepancy observed between the predicted and experimental switching fields in correlated insulators under a DC electric field far-from-equilibrium necessitates a reevaluation of current microscopic understanding. Here we show that an electron avalanche can occur in the bulk limit of such insulators at arbitrarily small electric field by introducing a generic model of electrons coupled to an inelastic medium of phonons. The quantum avalanche arises by the generation of a ladder of in-gap states, created by a multi-phonon emission process. Hot-phonons in the avalanche trigger a premature and partial collapse of the correlated gap. The phonon spectrum dictates the existence of two-stage versus single-stage switching events which we associate with charge-density-wave and Mott resistive phase transitions, respectively. The behavior of electron and phonon temperatures, as well as the temperature dependence of the threshold fields, demonstrates how a crossover between the thermal and quantum switching scenarios emerges within a unified framework of the quantum avalanche.

Dates et versions

hal-04105682 , version 1 (28-11-2022)
hal-04105682 , version 2 (24-05-2023)

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Jong E Han, Camille Aron, Xi Chen, Ishiaka Mansaray, Jae-Ho Han, et al.. Correlated insulator collapse due to quantum avalanche via in-gap ladder states. Nature Communications, 2023, 14 (1), pp.2936. ⟨10.1038/s41467-023-38557-8⟩. ⟨hal-04105682v2⟩
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