Publications [#323837] of Harold U. Baranger

Papers Published
  1. Zhang, G; Novais, E; Baranger, HU, Rescuing a Quantum Phase Transition with Quantum Noise., Physical Review Letters, vol. 118 no. 5 (February, 2017), pp. 050402 [doi] .

    We show that placing a quantum system in contact with an environment can enhance non-Fermi-liquid correlations, rather than destroy quantum effects, as is typical. The system consists of two quantum dots in series with two leads; the highly resistive leads couple charge flow through the dots to the electromagnetic environment, the source of quantum noise. While the charge transport inhibits a quantum phase transition, the quantum noise reduces charge transport and restores the transition. We find a non-Fermi-liquid intermediate fixed point for all strengths of the noise. For strong noise, it is similar to the intermediate fixed point of the two-impurity Kondo model.