Coulomb blockade and Quantum Critical Points in Quantum Dots

Details Coulomb blockade and Quantum Critical Points in Quantum Dots Coulomb blockade and Quantum Critical Points in Quantum Dots

2004-06-14

arxiv.org/abs/cond-mat/0406316v1

Physica B: Condensed Matter, 359-361, 1381 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

2 pages, 3 figures, Elsevier Science style

Scientific paper

10.1016/j.physb.2005.01.427

An ultrasmall quantum dot coupled to a lead and to a quantum box (a large quantum dot) is investigated. Tuning the tunneling amplitudes to the lead and box, we find a line of unstable non-Fermi-liquid fixed points as function of the gate potentials of the quantum dots, extending to arbitrary charging energies on the small and large quantum dots. These quantum-critical fixed points possess a finite residual entropy. They govern the cross over from one Fermi-liquid regime to another, characterized by distinct (high and low) conductance values.

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