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

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Title
Correlated insulator collapse due to quantum avalanche via in-gap ladder states
Author(s)
Han, Jong E.; Aron, Camille; Chen, Xi; Mansaray, Ishiaka; Jae-Ho Han; Kim, Ki-Seok; Randle, Michael; Bird, Jonathan P.
Publication Date
2023-05
Journal
Nature Communications, v.14, no.1
Publisher
Nature Research
Abstract
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. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13497
DOI
10.1038/s41467-023-38557-8
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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