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.

*This work was supported by the Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract DE-AC02-76SF00515.

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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