Quantum Criticality and the Non-linear I-V Curve of Two-channel Kondo-Luttinger System

ORAL

Abstract

We theoretically study the quantum phase transition and non-linear I-V curve of a Kondo impurity in a Luttinger liquid wire. With decreasing Luttinger parameter K (or increasing electron interactions), it has been known since 1990s that the system undergoes a quantum phase transition from 1-channel (1CK) to 2-channel Kondo (2CK) ground states at K=1/2. However, the quantum critical properties near this transition is not known to date due to the lack of controlled theoretical tools to examine the physics near the strong coupling 2CK fixed point. Via bosonization-refermionization approach, we map the system near 1CK-2CK quantum critical point (QCP) and near the Toulouse limit onto an effective fermionic model in weak coupling regime subject to a bosoinc bath. The 1CK-2CK QCP is identified via renormalization group technique. The analytical form of the non-linear differential conductance and various critical exponents near this novel QCP are obtained. Our results are relevant for the recent experiment in a dissipative quantum dot via a double-barrier potential.

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Presenters

  • 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

Authors

  • Chao-Yun Lin

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

  • Colin Rylands

    Department of Physics and Astronomy, Rutgers University

  • Natan Andrei

    Department of Physics, Rutgers University, Piscataway, New Jersey, U.S.A., Department of Physics and Astronomy, Rutgers University, Physics, Rutgers University, Center for Materials Theory, Rutgers University

  • 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