Density-wave instabilities of fractionalized Fermi liquids

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Density-wave instabilities of fractionalized Fermi liquids

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Title: Density-wave instabilities of fractionalized Fermi liquids
Author: Chowdhury, Debanjan; Sachdev, Subir

Note: Order does not necessarily reflect citation order of authors.

Citation: Chowdhury, Debanjan, and Subir Sachdev. 2014. “Density-Wave Instabilities of Fractionalized Fermi Liquids.” Phys. Rev. B 90 (24) (December). doi:10.1103/physrevb.90.245136.
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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.
Published Version: doi:10.1103/PhysRevB.90.245136
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