Phys. Rev. Lett. 99, 036602 (2007) [4 pages]Self-Polarization and Dynamical Cooling of Nuclear Spins in Double Quantum DotsReceived 18 September 2006; published 19 July 2007 The spin-blockade regime of double quantum dots features coupled dynamics of electron and nuclear spins resulting from the hyperfine interaction. We explain observed nuclear self-polarization via a mechanism based on feedback of the Overhauser shift on electron energy levels, and propose to use the instability toward self-polarization as a vehicle for controlling the nuclear spin distribution. In the dynamics induced by a properly chosen time-dependent magnetic field, nuclear spin fluctuations can be suppressed significantly below the thermal level. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.036602
DOI:
10.1103/PhysRevLett.99.036602
PACS:
72.25.Pn, 05.65.+b, 05.70.Ln, 72.25.Rb
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.