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Modeling a striped pseudogap state

Journal article
Authors Mats Granath
Brian M. Andersen
Published in Physical Review B
Volume 81
Issue 2
Pages 024501 (12 pages)
ISSN 1098-0121
Publication year 2010
Published at Department of Physics (GU)
Pages 024501 (12 pages)
Language en
Links dx.doi.org/10.1103/PhysRevB.81.0245...
Subject categories Condensed Matter Physics, Magnetism, Superconductivity

Abstract

We study the electronic structure within a system of phase-decoupled one-dimensional superconductors coexisting with stripe spin and charge-density-wave order. This system has a nodal Fermi surface (Fermi arc) in the form of a hole pocket and an antinodal pseudogap. The spectral function in the antinodes is approximately particle-hole symmetric contrary to the gapped regions just outside the pocket. We find that states at the Fermi energy are extended whereas states near the pseudogap energy have localization lengths as short as the interstripe spacing. We consider pairing which has either local d-wave or s-wave symmetry and find similar results in both cases, consistent with the pseudogap being an effect of local pair correlations. We suggest that this state is a stripe-ordered caricature of the pseudogap phase in underdoped cuprates with coexisting spin-, charge-, and pair-density-wave correlations. Lastly, we also model a superconducting state which (1) evolves smoothly from the pseudogap state, (2) has a signature subgap peak in the density of states, and (3) has the coherent pair density concentrated to the nodal region.

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