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Spin control by ultra short laser pulses in a Mn doped quantum dot
Author(s) -
Reiter Doris E.,
Axt Vollrath Martin,
Kuhn Tilmann
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200880622
Subject(s) - exciton , femtosecond , spin flip , picosecond , quantum dot , biexciton , physics , excited state , spin (aerodynamics) , atomic physics , exchange interaction , rabi cycle , condensed matter physics , angular momentum , laser , optoelectronics , quantum , optics , quantum mechanics , scattering , ferromagnetism , thermodynamics
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. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)