Ground-state phase diagram of the one-dimensional tJ model with pair hopping terms

J. R. Coulthard, S. R. Clark, and D. Jaksch
Phys. Rev. B 98, 035116 – Published 13 July 2018

Abstract

The tJ model is a standard model of strongly correlated electrons, often studied in the context of high-Tc superconductivity. However, most studies of this model neglect three-site terms, which appear at the same order as the superexchange J. As these terms correspond to pair hopping, they are expected to play an important role in the physics of superconductivity when doped sufficiently far from half filling. We present a density matrix renormalization-group study of the one-dimensional tJ model with the pair hopping terms included. We demonstrate that these additional terms radically change the one-dimensional ground-state phase diagram, extending the superconducting region at low fillings, while at larger fillings, superconductivity is completely suppressed. We explain this effect by introducing a simplified effective model of repulsive hardcore bosons.

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  • Received 27 April 2018
  • Revised 28 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.035116

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. R. Coulthard1, S. R. Clark2,3, and D. Jaksch1,4

  • 1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
  • 2Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
  • 3Max Planck Institute for the Structure and Dynamics of Matter, University of Hamburg CFEL, Hamburg 22761, Germany
  • 4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543

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Issue

Vol. 98, Iss. 3 — 15 July 2018

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