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Charge Friedel oscillations in a Mott insulator

Authors
  • Mross, David F.
  • Senthil, T.
Type
Published Article
Publication Date
Jul 14, 2010
Submission Date
Jul 14, 2010
Identifiers
DOI: 10.1103/PhysRevB.84.041102
Source
arXiv
License
Yellow
External links

Abstract

When a metal undergoes a transition to an insulator it will lose its electronic Fermi surface. Interestingly in some situations a `ghost' Fermi surface of electrically neutral spin carrying fermions may survive into the insulator. Such a novel ghost Fermi surface has been proposed to underlie the properties of a few different materials but its direct detection has proven elusive. In this paper we show that the ghost Fermi surface leads to slowly decaying spatial oscillations of the electron density near impurities or other defects. These and related oscillations stem from the sharpness of the ghost Fermi surface and are direct analogs of the familiar Friedel oscillations in metals. The oscillation period contains geometric information about the shape of the ghost Fermi surface which can be potentially exploited to detect its existence.

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