Wednesday, July 3, 2013

1307.0004 (A. Liam Fitzpatrick et al.)

Non-Fermi liquid fixed point in a Wilsonian theory of quantum critical

A. Liam Fitzpatrick, Shamit Kachru, Jared Kaplan, S. Raghu
We study the problem of disorder-free metals near a continuous quantum critical point. We depart from the standard paradigm of Hertz and Millis, and treat both fermions and bosons i.e. order parameter fields) on equal footing. We construct a Wilsonian effective field theory that integrates out only high energy boson and fermion modes. Below the upper critical dimension of the theory (d=3 spatial dimensions), we find new fixed points in which the bosons are described by the Wilson-Fisher fixed point and are coupled to a non-Fermi liquid metal. We describe subtleties with the renormalization group flow of four-Fermi interactions, which can be surmounted in a controlled large N limit. In this limit, we find that the theory has no superconducting instability.
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