Dynamics of capacitively coupled double quantum dots
| Autor: | Martin R. Galpin, David E. Logan, H. R. Krishnamurthy |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Quantum phase transition Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics FOS: Physical sciences Conductance Electron Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Universality (dynamical systems) Condensed Matter - Strongly Correlated Electrons Quantum dot Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Symmetry breaking Double quantum Scaling |
| DOI: | 10.1088/0953-8984/18/29/002 |
| Popis: | We consider a double dot system of equivalent, capacitively coupled semiconducting quantum dots, each coupled to its own lead, in a regime where there are two electrons on the double dot. Employing the numerical renormalization group, we focus here on single-particle dynamics and the zero-bias conductance, considering in particular the rich range of behaviour arising as the interdot coupling is progressively increased through the strong coupling (SC) phase, from the spin-Kondo regime, across the SU(4) point to the charge-Kondo regime; and then towards and through the quantum phase transition to a charge-ordered (CO) phase. We first consider the two-self-energy description required to describe the broken symmetry CO phase, and implications thereof for the non-Fermi liquid nature of this phase. Numerical results for single-particle dynamics on all frequency scales are then considered, with particular emphasis on universality and scaling of low-energy dynamics throughout the SC phase. The role of symmetry breaking perturbations is also briefly discussed. 14 pages, 6 figures |
| Databáze: | OpenAIRE |
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