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Quantum critical metals in 3+1 dimensions

Tuesday, April 23, 2013 at 4:00pm to 5:00pm

Clark Hall, 700
Central Campus

LASSP and A&EP Seminar by Srinivas Raghu, Stanford University.

 

Abstract - We study the problem of disorder-free metals near a continuous Ising nematic quantum critical point in $d=3+1$ dimensions. We begin with perturbation theory in the `Yukawa' coupling between the electrons and undamped bosons (nematic order parameter fluctuations) and show that the perturbation expansion breaks down below energy scales where the bosons get substantially Landau damped. Above this scale however, we find a regime in which low-energy fermions obtain an imaginary self-energy that varies linearly with frequency, realizing the `marginal Fermi liquid' phenomenology. We discuss a large N theory in which the marginal Fermi liquid behavior is enhanced while the role of Landau damping is suppressed, and show that quasiparticles obtain a decay rate parametrically larger than their energy. 
 

Reference: arXiv:1303.1587 (submitted to PRB)

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Event Type

Seminar

Departments

LASSP, Physics

Tags

lassp_and_aep_seminar, lassp

Website

http://www.lassp.cornell.edu/events/

Contact E-Mail

dem8@cornell.edu

Contact Name

Mr. Douglas E. Milton, Sr.

Contact Phone

255-9684

Speaker

Srinivas Raghu

Speaker Affiliation

Stanford University

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