Influence Of Nonequilibrium Phonons On The Spin Dynamics Of A Single Cr Atom
PHYSICAL REVIEW B(2020)
Abstract
We analyze the influence of optically generated nonequilibrium phonons on the spin relaxation and effective spin temperature of an individual Cr atom inserted in a quantum dot. Using a three-pulse pump-probe technique, we show that the spin relaxation measured in resonant optical pumping experiments strongly depends on the optical excitation conditions. We observe for an isolated Cr in the dark a heating time shorter than a few hundred nanoseconds after an initial high-power nonresonant excitation pulse. A cooling time larger than a few tens of microseconds, independent of the excitation, is obtained in the same experimental conditions. We show that a tunable spin-lattice coupling dependent on the density of nonequilibrium phonons can explain the observed dynamics. Low-energy excitation conditions are found where the Cr spin states S-z = +/- 1 can be efficiently populated by a nonresonant optical excitation, prepared and read out by resonant optical pumping and conserved in the dark for a few microseconds.
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