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Multicritical Fermi Surface Topological Transitions

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journal contribution
posted on 21.10.2019, 11:26 by Dmitry Efremov, Alex Shtyk, Andreas W Rost, Claudio Chamon, Andrew P Mackenzie, Joseph BetourasJoseph Betouras
A wide variety of complex phases in quantum materials are driven by electron-electron interactions, which are enhanced through density of states peaks. A well-known example occurs at van Hove singularities where the Fermi surface undergoes a topological transition. Here we show that higher order singularities, where multiple disconnected leaves of Fermi surface touch all at once, naturally occur at points of high symmetry in the Brillouin zone. Such multicritical singularities can lead to stronger divergences in the density of states than canonical van Hove singularities, and critically boost the formation of complex quantum phases via interactions. As a concrete example of the power of these Fermi surface topological transitions, we demonstrate how they can be used in the analysis of experimental data on Sr3Ru2O7. Understanding the related mechanisms opens up new avenues in material design of complex quantum phases.

Funding

EPSRC grant No. EP/P002811/1 and Royal Society (JJB) and DOE Grant No. DE-FG02-06ER46316 (CC)

History

School

  • Science

Department

  • Physics

Published in

Physical Review Letters

Volume

123

Issue

20

Publisher

American Physical Society

Version

AM (Accepted Manuscript)

Rights holder

© American Physical Society

Publisher statement

This paper was accepted for publication in the journal Physical Review Letters and the definitive published version is available at https://doi.org/10.1103/PhysRevLett.123.207202.

Acceptance date

11/10/2019

Publication date

2019-11-13

Copyright date

2019

ISSN

0031-9007

eISSN

1079-7114

Language

en

Depositor

Dr Joseph Betouras. Deposit date: 18 October 2019

Article number

207202

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