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第四届清华信息前沿交叉论坛
清华大学材料科学与工程研究院《材料科学论坛》:High Entropy and Entropy-stabil...
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报告题目:
Large-N theory of critical Fermi surface and strange metal
 报告人:
Haoyu Guo 郭浩宇
哈佛大学
报告时间:
2022-08-18 15:00
报告地点:
Conference Hall 104, Science Building, Tsinghua University
主办单位:
高等研究院
  简介:

We describe the large N saddle point, and the structure of fluctuations about the saddle point, of a theory containing a sharp, critical Fermi surface in twospatial dimensions. The theory describes the onset of Ising order in a Fermi liquid, and closely related theories apply to other cases with critical Fermi surfaces. Inspired by SYK models, we employ random couplings in flavorspace between the fermions and the bosonic order parameter, but there is no spatial randomness: consequently, the G-Σ path integral of the theory is expressed in terms of fields bilocal in spacetime. We show by transport calculations that this first theory realizes a non-Fermi liquid but not a strange metal due to various cancellations related to momentum conservation. Next, we consider a theory with spatiallyrandom disorder, and demonstratethat it realizes a marginal Fermi liquid but not a strange metal. Finally, we propose that a strange metal can be realized by a theory with spatially random Yukawa interactions.

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