Quantum Phase Transition and Dynamically Enhanced Symmetry in Quadruple Quantum Dot System
arXiv:1008.1262 · doi:10.1103/PhysRevLett.105.256801
Abstract
We propose a system of four quantum dots designed to study the competition between three types of interactions: Heisenberg, Kondo and Ising. We find a rich phase diagram containing two sharp features: a quantum phase transition (QPT) between charge-ordered and charge-liquid phases, and a dramatic resonance in the charge liquid visible in the conductance. The QPT is of the Kosterlitz-Thouless type with a discontinuous jump in the conductance at the transition. We connect the resonance phenomenon with the degeneracy of three levels in the isolated quadruple dot and argue that this leads to a Kondo-like dynamical enhancement of symmetry from U(1) x Z_2 to U(1) x U(1).
4 pages main text + 4 pages supplementary material
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- Charge-Kondo effect mediated by repulsive interactions
- Local magnetic moments and electronic transport in closed loop quantum dot systems: a case of quadruple quantum dot ring at and away from equilibrium
- Observation of Kondo Effect in a Quadruple Quantum Dots
- Exact diagonalization study of double quantum dots in parallel geometry in zero-bandwidth limit
- Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads
- Long-range spin transport in asymmetric quadruple quantum dots configurations
- Are degenerate groundstates induced by spontaneous symmetry breakings in quantum phase transitions?