Large N theory of critical Fermi surfaces

Ilya Esterlis (Harvard)

12-Apr-2021, 18:30-19:30 (3 years ago)

Abstract: I will discuss recent work on a large-N theory of critical Fermi surfaces in two dimensions. The theory applies directly to the onset of Ising order in a Fermi liquid, and is easily generalized to other forms of order. By employing random couplings in flavor-space while retaining spatial translation invariance, we find the large-N saddle point equations are the same as those appearing in other contexts; e.g., Eliashberg-like theories, and our approach therefore provides a systematic framework for assessing and going beyond such theories. I will also discuss the the large-N phase diagram of the system away from criticality, and show that the ordered side is characterized by a regime of unusually strong thermal fluctuations. Time permitting, I will also review the behavior of various fermion bilinear operators, which can be used to diagnose the instabilities of the critical Fermi surface.

other condensed mattersoft condensed matterstatistical mechanicsstrongly correlated electronssuperconductivitygeneral relativity and quantum cosmologyHEP - theorymathematical physicschaotic dynamicsfluid dynamicsquantum physics

Audience: researchers in the topic


Kadanoff seminars

Organizers: Luca Delacretaz*, Nima Afkhami-Jeddi
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