Session Q5: Nonequilibrium and Gauge/Gravity Duality

11:15 AM–2:15 PM, Wednesday, February 29, 2012
Room: 206A

Sponsoring Unit: DCMP
Chair: Philip Phillips, University of Illinois at Urbana-Champaign

Abstract ID: BAPS.2012.MAR.Q5.9

Abstract: Q5.00009 : Dissipation-Induced Quantum Phase Transition in a Resonant Level

12:51 PM–1:03 PM

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Authors:

  Henok Mebrahtu
    (Duke University)

  Ivan Borzenets
    (Duke University)

  Dong E. Liu
    (Duke University)

  Huaixiu Zheng
    (Duke University)

  Yuri Bomze
    (Duke University)

  Alex Smirnov
    (North Carolina State University)

  Harold Baranger
    (Duke University)

  Gleb Finkelstein
    (Duke University)

We measure conductance through a resonant level coupled to a dissipative environment, which suppresses tunneling rate at low energies. Our sample consists of a single-walled carbon nanotube quantum dot contacted by resistive metal leads that serve as the dissipative environment. We study the shape of the resonant conductance peak, with the expectation that its width and height, both dependent on the tunneling rate, will be suppressed at low temperatures. However, we observe distinct regimes, including a case where the resonant tunneling conductance reaches the unitary limit, despite the presence of dissipation. We discuss the implication of these findings for a dissipation-induced quantum phase transition and extract the scaling exponents.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Q5.9