Density-wave instabilities of fractionalized Fermi liquids

Debanjan Chowdhury and Subir Sachdev
Phys. Rev. B 90, 245136 – Published 22 December 2014

Abstract

Recent experiments in the underdoped regime of the hole-doped cuprates have found evidence for an incommensurate charge density-wave state. We present an analysis of the charge ordering instabilities in a metal with antiferromagnetic correlations, where the electronic excitations are coupled to the fractionalized excitations of a quantum fluctuating antiferromagnet on the square lattice. The resulting charge density-wave state emerging out of such a fractionalized Fermi liquid (FL*) has wave vectors of the form (±Q0,0),(0,±Q0), with a predominantly d-form factor, in agreement with experiments on a number of different families of the cuprates. In contrast, as previously shown, the charge density-wave instability of a nearly antiferromagnetic metal with a large Fermi surface, interacting via short-range interactions, has wave vectors of the type (±Q0,±Q0). Our results show that the observed charge density-wave appears as a low-energy instability of a fractionalized metallic state linked to the proximity to an antiferromagnetic insulator, and the pseudogap regime can be described by such a metal at least over intermediate length and energy scales.

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  • Received 30 September 2014
  • Revised 7 December 2014

DOI:https://doi.org/10.1103/PhysRevB.90.245136

©2014 American Physical Society

Authors & Affiliations

Debanjan Chowdhury1 and Subir Sachdev1,2

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2Perimeter Institute of Theoretical Physics, Waterloo, Ontario, Canada N2L 2Y5

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Issue

Vol. 90, Iss. 24 — 15 December 2014

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