University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, April 4th 2018
1:25 pm:
Speaker: Sung-Sik Lee, Perimeter Institute
Subject: Low-energy effective field theories for non-Fermi liquids

Non-Fermi liquids are exotic metallic states which do not support well defined quasiparticles. Due to strong quantum fluctuations and the presence of extensive gapless modes near the Fermi surface, it has been difficult to understand universal low-energy properties of non-Fermi liquids. In this talk I will discuss recent progress made on field theories for non-Fermi liquids. Based on a dimensional regularization scheme which tunes the co-dimension of Fermi surface, critical exponents that control scaling behaviors of physical observables can be computed in controlled ways. The systematic expansion provides important insight into strongly interacting non-Fermi liquids. This allows us to find the non-perturbative solution for the strange metal realized at the antiferromagnetic quantum critical point in 2+1 dimensions, and predict the exact critical exponents that can be experimentally tested in layered systems.

Faculty Host: Andrey Chubukov

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