Exchange interaction effects in the thermodynamic properties of quantum dots
Mesoscale and Nanoscale Physics
2009-01-23 v1
Abstract
We study electron-electron interaction effects in the thermodynamic properties of quantum-dot systems. We obtain the direct and exchange contributions to the specific heat C_v in the self-consistent Hartree-Fock approximation at finite temperatures. An exchange-induced phase transition is observed and the transition temperature is shown to be inversely proportional to the size of the system. The exchange contribution to C_v dominates over the direct and kinetic contributions in the intermediate regime of interaction strength (r_s ~ 1). Furthermore, the electron-electron interaction modifies both the amplitude and the period of magnetic field induced oscillations in C_v.
Keywords
Cite
@article{arxiv.cond-mat/0412542,
title = {Exchange interaction effects in the thermodynamic properties of quantum dots},
author = {Luis G. Dias da Silva and Nelson Studart},
journal= {arXiv preprint arXiv:cond-mat/0412542},
year = {2009}
}
Comments
4 pages, 4 figures; To appear in Phys. Rev. B