Orbital current patterns in doped two-leg Cu-O Hubbard ladders

P. Chudzinski, M. Gabay, and T. Giamarchi
Phys. Rev. B 78, 075124 – Published 28 August 2008

Abstract

In the weak-coupling limit, we investigate two-leg ladders with a unit cell containing both Cu and O atoms as a function of doping. For purely repulsive interactions, using bosonization, we find significant differences with the single-orbital case: a completely massless quantum critical regime is obtained for a finite range of carrier concentration. In a broad region of the phase diagram, the ground state consists of a pattern of orbital currents plus a density wave. NMR properties of the Cu and O nuclei are presented for the various phases.

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  • Received 15 April 2008

DOI:https://doi.org/10.1103/PhysRevB.78.075124

©2008 American Physical Society

Authors & Affiliations

P. Chudzinski1, M. Gabay1, and T. Giamarchi2

  • 1Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud 11, Centre d’Orsay, 91405 Orsay Cedex, France
  • 2DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland

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Issue

Vol. 78, Iss. 7 — 15 August 2008

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