Controlling competing orders via nonequilibrium acoustic phonons: Emergence of anisotropic effective electronic temperature

Michael Schütt, Peter P. Orth, Alex Levchenko, Rafael M. Fernandes

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Ultrafast perturbations offer a unique tool to manipulate correlated systems due to their ability to promote transient behaviors with no equilibrium counterpart. A widely employed strategy is the excitation of coherent optical phonons, as they can cause significant changes in the electronic structure and interactions on short time scales. One of the issues, however, is the inevitable heating that accompanies these resonant excitations. Here, we explore a promising alternative route: the nonequilibrium excitation of acoustic phonons, which, due to their low excitation energies, generally lead to less heating. We demonstrate that driving acoustic phonons leads to the remarkable phenomenon of a momentum-dependent effective temperature, by which electronic states at different regions of the Fermi surface are subject to distinct local temperatures. Such an anisotropic effective electronic temperature can have a profound effect on the delicate balance between competing ordered states in unconventional superconductors, opening a so far unexplored avenue to control correlated phases.

Original languageEnglish (US)
Article number035135
JournalPhysical Review B
Volume97
Issue number3
DOIs
StatePublished - Jan 16 2018

Bibliographical note

Publisher Copyright:
© 2018 American Physical Society.

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