Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-31
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages & 4 figures, + 8 pages supplemental material
Scientific paper
The problem of how single "central" spins interact with a nuclear spin bath is essential for understanding decoherence and relaxation in many quantum systems, yet is highly nontrivial owing to the many-body couplings involved. Different models yield widely varying timescales and dynamical responses (exponential, power-law, Gaussian, etc). Here we detect the small random fluctuations of central spins in thermal equilibrium (holes in singly-charged (In,Ga)As quantum dots) to reveal the timescales and functional form of bath-induced spin relaxation. This spin noise indicates long (400 ns) spin correlation times at zero magnetic field, that increase to $\sim$5 $\mu$s as hole-nuclear coupling is suppressed with small (100 G) applied fields. Concomitantly, the noise lineshape evolves from Lorentzian to power-law, indicating a crossover from exponential to inverse-log dynamics.
Bayer Manfred
Crooker Scott A.
Li Yan
Reuter Dennis
Sinitsyn Nikolai
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