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Enhanced electron-phonon coupling near an electronic quantum phase transition

Gidopoulos, Nikitas

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I construct a simple model to demonstrate that when the manyelectron quantum state of a material is near a quantum phase transition and the vibrational motion of a phonon explores the potential energy surface near the transition point, then an impenetrable barrier appears at the potential energy surface which restricts the phonon from crossing the transition point and abnormally increases the phonon frequency. The ensuing anomalous enhancement of the electron phonon coupling is general and independent of the specic nature of the electronic quantum phase transition. Understanding and modelling this strong electron-phonon coupling may potentially lead to the design of phonon superconductors with high critical temperatures by choosing their parameters appropriately near an electronic quantum phase transition.

Journal Article Type Article
Acceptance Date Jan 21, 2022
Online Publication Date Feb 2, 2022
Publication Date Apr 6, 2022
Deposit Date Jan 13, 2022
Publicly Available Date Jan 13, 2022
Journal Journal of Physics: Condensed Matter
Print ISSN 0953-8984
Electronic ISSN 1361-648X
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 34
Issue 14
Article Number 14LT01
Public URL


Accepted Journal Article (782 Kb)

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