Spin control by ultra short laser pulses in a Mn doped quantum dot

Titelangaben

Reiter, Doris ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Spin control by ultra short laser pulses in a Mn doped quantum dot.
In: Physica Status Solidi B. Bd. 246 (2009) Heft 4 . - S. 779-783.
ISSN 1521-3951
DOI: https://doi.org/10.1002/pssb.200880622

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Abstract

Optically induced spin flip processes in quantum dots doped with a single Mn atom are discussed. On the femtosecond time scale the exciton can be controlled by ultra short laser pulses. Via the exchange interaction the Mn spin can flip on a picosecond time scale by transferring its angular momentum to the exciton. For a heavy hole system this flipping process can be described in terms of exchange-induced Rabi oscillations between the bright and dark exciton state accompanied by a flip of the Mn spin. Because of the energy splitting between bright and dark excitons the Rabi oscillations are off-resonant and a series of laser pulses is required to achieve a complete flip. When a light hole exciton is resonantly excited in addition to the heavy hole exciton we show that a flip of the Mn spin by two can be achieved by a series of light pulses while the exciton system returns to its initial state.