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Current-Induced Cooling of Nuclear Spins in Quantum Dots

Mark Rudner**, MIT**
__Abstract:__
Due to the coupling of electron and nuclear spins in quantum dots,
uncertainty in the nuclear spin state leads to undesirable effects in
electron spin dynamics such as dephasing and fluctuations in Zeeman energy.
Learning how to control nuclear spins in such systems will thus both
increase our possibilities for nuclear spin-based information storage and
manipulation, and our ability to coherently control the behavior of electron
spins. In this talk, I will cover some background of the interesting
physics of spin-blockade, and present a model of transport in this regime in
which internal feedback produces a squeezing effect on the nuclear spin
distribution. By tuning to this regime, we estimate that the width of the
nuclear spin distribution can be reduced by more than a factor of 10.