Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum Dots
Mesoscale and Nanoscale Physics
2010-08-23 v2
Abstract
Spontaneous nuclear polarization is predicted in double quantum dots in the spin-blocked electron transport regime. The polarization results from an instability of the zero-polarization state when singlet and triplet electron energy levels are brought into resonance by the effective hyperfine field of the nuclei on the electrons. The nuclear spins, once polarized, serve as a cold bath for cooling electrons below the lattice (phonon) temperature. We estimate the relevant time scales and discuss the conditions necessary to observe these phenomena.
Keywords
Cite
@article{arxiv.cond-mat/0609409,
title = {Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum Dots},
author = {M. S. Rudner and L. S. Levitov},
journal= {arXiv preprint arXiv:cond-mat/0609409},
year = {2010}
}
Comments
4 pages, 3 figures, updated journal version