PERSISTENT CURRENT IN AN ARTIFICIAL QUANTUM-DOT MOLECULE

Citation
R. Kotlyar et S. Dassarma, PERSISTENT CURRENT IN AN ARTIFICIAL QUANTUM-DOT MOLECULE, Physical review. B, Condensed matter, 55(16), 1997, pp. 10205-10208
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
55
Issue
16
Year of publication
1997
Pages
10205 - 10208
Database
ISI
SICI code
0163-1829(1997)55:16<10205:PCIAAQ>2.0.ZU;2-5
Abstract
Using an exact diagonalization technique within a generalized Mott-Hub bard Hamiltonian, we predict the existence of a ground-state'persisten t current in coherent two-dimensional semiconductor quantum-dot arrays pierced by an external magnetic flux. The calculated persistent curre nt, which arises from the nontrivial dependence of the ground-state en ergy on the external flux, exists in isolated arrays without any perio dic boundary condition. The sensitivity of the calculated persistent c urrent to interaction and disorder is shown to reflect the intricacies of various Anderson-Mott-Hubbard quantum phase transitions in two-dim ensional systems.