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Quantum Criticality from Sequential Destruction of SU(4) Spin-Orbital-coupled Kondo Effect*

ORAL

Abstract

Quantum criticality and the beyond-Landau physics of Kondo destruction [1,2] have recently been studied in systems with multipolar degrees of freedom. The compound Ce3Pd20Si6 shows evidence of two consecutive Fermi surface collapsing quantum critical points (QCPs) as it is tuned from a paramagnetic to an antiferroquadrupolar and then to an antiferromagnetic state [3]. A theory was advanced [3] for a sequential destruction of spin-orbital-coupled Kondo entanglement in an SU(4) Bose-Fermi Kondo model, an effective model for a multipolar Kondo lattice. Here we report an analytical renormalization group calculation of the model with Ising anisotropy, using a Coulomb-gas representation. We show that a generic trajectory in the parameter space contains two QCPs associated with the destruction of the orbital and spin Kondo effects, respectively. Our work establishes a firm theoretical ground for the sequential Kondo destruction.

[1] Q. Si et al., Nature 413, 804 (2001).
[2] S. Paschen et al., Nature 432, 881 (2004).
[3] V. Martelli, A. Cai, E. M. Nica, M. Taupin, A. Prokofiev, C.-C. Liu, H.-H. Lai, R. Yu, K. Ingersent, R. Küchler, A. M. Strydom, D. Geiger, J. Haenel, J. Larrea, Q. Si, and S. Paschen, PNAS 116, 17701 (2019).

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Presenters

  • Silke Buehler-Paschen

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

Authors

  • Silke Buehler-Paschen

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

  • Chia-Chuan Liu

    Rice Univ

  • Ang Cai

    Rice Univ, Rice University

  • Emilian Nica

    Department of Physics, Arizona State Univ, Arizona State University, Department of Physics, Arizona State University, Arizona State Univ, Arizona State Unviversity

  • Rong Yu

    Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Renmin University of China, Department of Physics, Renmin University of China, Renmin University, Tsinghua University

  • Kevin Ingersent

    University of Florida

  • Qimiao Si

    Department of Physics and Astronomy, Rice University, Rice Univ, Physics and Astronomy, Rice University, Rice University