Multicritical Fermi surface topological transitions
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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.
Efremov , D V , Shtyk , A , Rost , A W , Chamon , C , Mackenzie , A P & Betouras , J J 2019 , ' Multicritical Fermi surface topological transitions ' , Physical Review Letters , vol. 123 , no. 20 , 207202 , pp. 1-6 . https://doi.org/10.1103/PhysRevLett.123.207202
Physical Review Letters
Copyright © 2019 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1103/PhysRevLett.123.207202
DescriptionFunding: UK EPSRC Grants No. EP/P002811/1 (JJB) and No. EP/P024564/1 (AWR); Royal Society (JJB and CC); DOE Grant No. DE-FG02-06ER46316 (CC).
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