Field induced quantum spin liquid with spinon Fermi surfaces in the Kitaev model

ORAL

Abstract

Recent experimental evidence for a field-induced quantum spin liquid (QSL) in α-RuCl3 calls for an understanding for the ground state of honeycomb Kitaev model under a magnetic field. In this work we address the nature of an enigmatic gapless paramagnetic phase in the antiferromagnetic Kitave model, under an intermediate magnetic field perpendicular to the plane. Combining theoretical and numerical efforts, we identify this gapless phase as a U(1) QSL with spinon Fermi surfaces. We also reveal the nature of continuous quantum phase transitions involving this U(1) QSL, and obtain a phase diagram of the Kitaev model as a function of bond anisotropy and perpendicular magnetic field.

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Presenters

  • Changyan Wang

    Department of Physics, The Ohio State University

Authors

  • 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

  • Changyan Wang

    Department of Physics, The Ohio State University

  • Biao Huang

    University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh

  • Yuan-Ming Lu

    Ohio State University, Physics, Ohio State University, Physics, OSU, Department of Physics, Ohio State University, Department of Physics, The Ohio State University, Deaprtment of Physics, Ohio State University