Theory of the time-resolved Kerr rotation on trapped holes

Details Theory of the time-resolved Kerr rotation on trapped holes Theory of the time-resolved Kerr rotation on trapped holes

2009-10-22

arxiv.org/abs/0910.4287v2

Phys. Rev. B 81, 115306 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 7 figures

Scientific paper

10.1103/PhysRevB.81.115306

We formulate a model of the time-resolved Kerr rotation experiment on a single hole in a semiconductor nanostructure (e.g., a quantum dot) or on an ensemble of trapped holes (e.g., in a quantum well) in a tilted magnetic field. We use a generic Markovian description of the hole and trion dephasing and focus on the interpretation of the time-resolved signal in terms of the microscopic evolution of the spin polarization. We show that the signal in an off-plane field contains components that reveal both the spin relaxation rate and the spin coherence dephasing rate. We derive analytical formulas for the hole spin polarization, which may be used to extract the two relevant rates by fitting to the measurement data.

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