On the origin of quantum criticality found at finite doping in 2D Hubbard model

ORAL

Abstract

To better understand the excitations responsible for quantum criticality (QC) found at finite doping in the 2D Hubbard model, we analyze the vertices for different scattering channels obtained from the Dynamical Cluster Continuous-Time Quantum Monte Carlo simulation. By decomposing these vertices using the parquet equations we find that both superconductivity and the charge instabilities responsible for the QC come from the crossed spin channel contribution, and thus are driven by the spin-fluctuations. On contrast, the spin instability comes from the fully irreducible spin vertex contribution.

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Authors

  • Shuxiang Yang

    Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • Herbert Fotso

    Louisiana State University, Department of Physics and Astronomy, Louisiana Sate University

  • Juana Moreno

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • Mark Jarrell

    Louisiana State University, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Department of Physics and Astronomy, Louisiana State University