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Quantum criticality out of equilibrium in the pseudogap Kondo model.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . May2012, Vol. 85 Issue 19, p1-6. 6p. - Publication Year :
- 2012
-
Abstract
- Quantum phase transitions out of equilibrium are outstanding emergent subjects in condensed matter physics with great fundamental importance and challenges. We theoretically investigate here the nonequilibrium quantum phase transition in a generic nano-setup: the pseudogap Kondo model where a Kondo quantum dot couples to two--left (L) and right (R)--voltage-biased fermionic leads with power-law density of states (DOS) with respect to their Fermi levels ßt/R, Pcxwi') oc |a) -- ÍÜCR)!' with 0 < r < 1. In equilibrium (jLt¿ -- /x,; = 0) and for 0 < r < 1/2, with increasing Kondo correlations this model exhibits a quantum phase transition from a unscreened local moment (LM) phase to the Kondo screened phase. At finite bias voltages and near criticality, we discover new nonequilibrium universal scaling behaviors in conductance, conduction electron T matrix, and local spin susceptibility via a controlled frequency-dependent renormalization group (RG) approach. The current-induced decoherence is key to understanding these distinct universal nonequilibrium quantum critical regimes. The relevance of our results to experiment is discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 85
- Issue :
- 19
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 77635375
- Full Text :
- https://doi.org/10.1103/PhysRevB.85.195106