A two-plaquette polaron picture for the single-hole state of cuprates

Hai Yao Deng, Chi Hang Lam, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The pseudogap phase in high T c superconductors has attracted intense research efforts in recent years. This phase is expected to be intimately linked with the state of an excess O hole doped in the CuO 2 plane. In the present paper, we investigate the nature of this single-hole state theoretically. Special attention is paid to the influences from the O sublattice. We argue that in the case of strong covalent bonding, the motions of O atoms can be very anisotropic: these atoms may find themselves in a single-well potential when moving perpendicular to the CuOCu bond directions, but in a double-well potential when moving along that direction. As a consequence, a two-plaquette localized polaron state can be realized for a doped hole in the CuO 2 plane. The energy of this state is evaluated via a variational method. It breaks several symmetries locally and these symmetries have been experimentally observed to be broken also in the pseudogap phase.
Original languageEnglish
Article number075003
JournalSuperconductor Science and Technology
Volume25
Issue number7
DOIs
Publication statusPublished - 1 Jul 2012

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

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