Rescuing a Quantum Phase Transition with Quantum Noise
Abstract
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.
Cite
@article{arxiv.1604.07440,
title = {Rescuing a Quantum Phase Transition with Quantum Noise},
author = {Gu Zhang and Eduardo Novais and Harold U. Baranger},
journal= {arXiv preprint arXiv:1604.07440},
year = {2017}
}
Comments
Published version: shortened, several points clarified, references added. 6 pages + 6 supplementary