Rescuing a Quantum Phase Transition with Quantum Noise

Autor(es)

Zhang, Gu ; Novais, E. ; Baranger, Harold U.

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 118, n. 5 FEB 2 2017.
• Citações Web of Science: 2

Resumo

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. (AU)

• Processo FAPESP: 14/26356-9 - Fase quânticas de sistemas fora do equilíbrio em problemas de informação quântica
• Beneficiário: Eduardo Peres Novais de Sá
• Modalidade de apoio: Auxílio à Pesquisa - Regular