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Rescuing a Quantum Phase Transition with Quantum Noise

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Duke Univ., Durham, NC (United States); Duke University, Dept of Physics
  2. Federal Univ. of ABC, Santo Andre, SP (Brazil)
  3. Duke Univ., Durham, NC (United States)
In this work, 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.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
São Paulo Research Foundation (FAPESP); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0005237
OSTI ID:
1783706
Alternate ID(s):
OSTI ID: 1342450
OSTI ID: 1536476
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 118; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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