Schwinger boson approach to the Kondo lattice model

ORAL

Abstract

The microscopic mechanism of the heavy-fermion systems close to anti-ferromagnetic quantum critical point constitutes an outstanding open problem in correlated electron systems. To address this issue, we employ a distinct route from the dynamical mean-field theory by solving the 2D Kondo-Heisenberg model via a dynamical large-N multichannel Schwinger boson approach. We identify the quantum critical point separating the anti-ferromagnetic long-ranged ordered and the heavy Kondo-screened Fermi-liquid phases. Various thermodynamical observables near criticality show non-Fermi liquid behaviors and agree qualitatively well with the experiments seen in CeCu6-xAux and YbRh2Si2.

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Presenters

  • Jiangfan Wang

    • Department of Eletrophysics, National Chiao Tung University

Authors

  • Jiangfan Wang

    • Department of Eletrophysics, National Chiao Tung University

  • Yung-Yeh Chang

    • Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, R.O.C.
    • National Chiao Tung University
    • Department of Eletrophysics, National Chiao Tung University
    • Department of Electrophysics, National Chiao Tung University

  • Chung-Yu Mou

    • Department of physics, National Tsing-Hua University
    • Departmeny of Physics, National Tsing Hua University, Hsinchu, Taiwan
    • Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

  • Stefan B. Kirchner

    • Department of Physics, Zhejiang University

  • Silke Buehler-Paschen

    • Institute of Solid State Physics, Vienna University of Technology
    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology
    • Vienna University of Technology

  • Chung-Hou Chung

    • Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, R.O.C.
    • National Chiao Tung University
    • Department of Eletrophysics, National Chiao Tung University
    • Department of Electrophysics, National Chiao Tung University
    • Electrophysics Department, National Chiao-Tung University, Hsinchu, Taiwan
    • Electrophysics Department, National Chiao-Tung University, Taiwan