Ground state phase diagram of doped Hubbard model on 4-leg cylinders

ORAL

Abstract

We report a large-scale density-matrix renormalization group study of the lightly doped Hubbard model on 4-leg cylinders in the presence of next-nearest hopping t'. By keeping a large number of states for long system sizes, we are able to reveal a rich phase diagram consisting of a variety of distinct phases, including (1) The Luther-Emery (LE) liquid with quasi-long-range superconductivity (SC) and charge-density-wave (CDW) order, but with a gap in the spin sector; (2) Insulating phase with "filled" charge stripe and long-range CDW order but no long-range SC, and (3) Luttinger liquid phase with dominant single-particle correlation and subdominant SC and CDW correlations. In particular, at δ=12.5% doping concentration, we found that a tiny t'∼-0.01t is enough to drive the system out of the insulating state at t'=0 to the LE phase. Aside from t', the effect of Coulomb repulsion and doping concentration has also been explored. Our results indicate that a route to robust long-range superconductivity involves destabilizing insulating charge stripes in the doped Hubbard model.

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Presenters

  • Yifan Jiang

    Standford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University

Authors

  • Yifan Jiang

    Standford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University

  • Thomas Devereaux

    Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, Physics, Stanford University, SLAC and Stanford University, Institute for Materials and Energy Science, Stanford, SIMES, SLAC National Accelerator Lab, SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC, Stanford, SIMES, SLAC, and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University

  • Hong-Chen Jiang

    Stanford Institute for Materials and Energy Sciences, SLAC and Stanford University, SIMES, SLAC, and Stanford University, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University