Electron-nuclear dynamics in a quantum dot under non-unitary electron control

Details Electron-nuclear dynamics in a quantum dot under non-unitary electron control Electron-nuclear dynamics in a quantum dot under non-unitary electron control

2011-01-24

arxiv.org/abs/1101.4422v2

Phys. Rev. Lett. 107, 047601 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.107.047601

We introduce a method for solving the problem of an externally controlled electron spin in a quantum dot interacting with host nuclei via the hyperfine interaction. Our method accounts for generalized (non-unitary) evolution effected by external controls and the environment, such as coherent lasers combined with spontaneous emission. As a concrete example we develop the microscopic theory of the dynamics of nuclear-induced frequency focusing, as first measured in Science 317, 1896 (2007); we find that the nuclear relaxation rates are several orders of magnitude faster than those quoted in that work.

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