Enhanced electron-phonon coupling near an electronic quantum phase transition

Gidopoulos, Nikitas

Abstract

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.

Citation

Gidopoulos, N. (2022). Enhanced electron-phonon coupling near an electronic quantum phase transition. Journal of Physics: Condensed Matter, 34(14), Article 14LT01. https://doi.org/10.1088/1361-648x/ac4dbe

• 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
• DOI: https://doi.org/10.1088/1361-648x/ac4dbe
• Public URL: https://durham-repository.worktribe.com/output/1217924