Sequential Kondo destruction in an SU(4) Bose-Fermi Kondo model

ORAL

Abstract

Quantum criticality and the beyond-Landau physics of Kondo destruction [1,2] in heavy fermion systems with multipolar degrees of freedom is attracting considerable interest. Recent experiment on the heavy fermion compound Ce3Pd20Si6 shows evidence of two consecutive Fermi surface collapsing quantum phase transitions (QPT) as a function of magnetic field [3]. We advance a theory of two stages of Kondo effect. We consider an SU(4) Bose-Fermi Kondo model with both spin and orbital degrees of freedom, which represents an effective model for a multipolar Kondo lattice system. As a function of coupling strength to the bosonic baths, we find that a generic trajectory in the parameter space contains two QPTs, each being associated with the Kondo destruction of spin or orbital degrees of freedom. For Kondo lattice, this corresponds to two stages of Fermi surface jump, thus providing a natural understanding of the experimental findings.

[1] Q. Si et al., Nature 413, 804 (2001)
[2] S. Paschen et al., Nature 432, 881 (2004)
[3] V. Martelli et al., arXiv:1709.09376].

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Presenters

  • Ang Cai

    Rice Universiry, Rice University

Authors

  • Rong Yu

    Renmin University, Renmin University of China, Department of Physics, Renmin University of China

  • Ang Cai

    Rice Universiry, Rice University

  • Emilian Nica

    University of British Columbia, The University of British Columbia, Univ of British Columbia

  • Chia-Chuan Liu

    Physics and Astronomy, Rice Univ, Rice Universiry, Rice Univ

  • Silke Buehler-Paschen

    Physics, Institute of Solid State Physics, Vienna University of Technology, Vienna University of Technology, Institute of Solid State Physics, Vienna University of Technology

  • Qimiao Si

    Department of Physics and Astronomy, Rice University, Physics and Astronomy, Rice Univ, Physics and Astronomy, Rice University, Rice Univ, Rice Universiry, Physics, Rice University, Rice University, Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Physics and Astronomy, and Rice Center for Quantum Materials, Rice University, Department of Physics and Astronomy, Rice Univ