Itinerant quantum critical point with frustration and non-Fermi-liquid

ORAL

Abstract

Employing the self-learning quantum Monte Carlo algorithm, we investigate the frustrated transverse-field triangle-lattice Ising model coupled to a Fermi surface. Without fermions, the spin degrees of freedom undergoes a second-order quantum phase transition between paramagnetic and clock-ordered phases. This quantum critical point (QCP) has an emergent U(1) symmetry and thus belongs to the 2+1D XY universality class. In the presence of fermions, spin fluctuations introduce effective interactions among fermions and distort the bare Fermi surface towards an interacting one with hot spots and fermi pockets. Near the QCP, non-Fermi-liquid behavior are observed at the hot spots, and the QCP is rendered into a different universality with Hertz-Millis type exponents. The detailed properties of this QCP and possibly related experimental systems are also discussed.

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Presenters

  • ZiHong Liu

    The Institute of Physics, Chinese Academy of Sciences

Authors

  • ZiHong Liu

    The Institute of Physics, Chinese Academy of Sciences

  • Xiao Yan Xu

    Department of Physics, Hong Kong University of Science and Technology, The Institute of Physics, Chinese Academy of Sciences

  • Yang Qi

    Department of Physics, Massachusetts Institute of Technology, Department of physics, Massachusetts Institute of Technology

  • Kai Sun

    Physics, Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, Univ of Michigan - Ann Arbor, Physics, University of Michigan - Ann Arbor, Materials Science and Engineering, University of Michigan

  • ZiYang Meng

    T03, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, The Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Scienes (CAS), Institution of physics, Chinese Academic of Sciences (CAS)