Absence of quantum phase transition in two-state quantum dot

ORAL

Abstract

We use continuous-time quantum Monte Carlo methods to study a model of a spinless-fermion two state quantum dot which was argued in Ref. [1] to exhibit a quantum phase transition. We find instead a smooth behavior as parameters are varied. The generalization of the model to the spinful case is also presented. [1] D. I. Golosov and Y. Gefen, {\em Phys. Rev. B} {\bf 74}, 205316 (2006).

*This work was supported by the Nanoscale Science and Engineering Initiative of the National Science Foundation under NSF Award Number CHE-0641523 and by NSF-DMR-0705847

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Authors

  • Xin Wang

    • Columbia University

  • Andrew J. Millis

    • Columbia University
    • Department of Physics, Columbia University, 538 W. 120th Street, New York, NY
    • Department of Physics, Columbia University