Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum Dots

Details Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum Dots Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum Dots

2006-09-17

arxiv.org/abs/cond-mat/0609409v2

Physical Review Letters 99, 036602 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, updated journal version

Scientific paper

10.1103/PhysRevLett.99.036602

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.

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