Optical cooling of nuclear spins in GaAs/(Al,Ga)As quantum wells at subkelvin temperatures: Evidence of the dynamic self-polarization of nuclear spins

M. Kotur, D. Kudlacik, N. E. Kopteva +4

We investigate the dynamic polarization of nuclear spins in a nominally undoped GaAs/Al${}_{0.35}$Ga${}_{0.65}$As quantum well using two complementary experimental approaches: time-res…