Dynamics of optical injection of charge and spin currents in quantum wells
We develop a dynamical theory for the optical injection of charge and spin current originating from the interferences between two coherent laser pulses of frequencies omega and 2omega. Multiband Bloch equations which include one- and two-photon interband transitions are derived. They also account for ac Stark shifts and intersubband two-photon transitions. The model is used to describe the case of time-dependent charge and spin current injection in a symmetric GaAs/AlGaAs quantum well. A comparison to the bulk case is also made. The separate contributions of the populations and intersubband coherences to the charge current and THz emission are identified. The influence of the Stark shifts and the inter-valence-band two-photon transitions are calculated and discussed.
WOS:000188883800079
2004
69
3
035335
Ecole Polytech Fed Lausanne, Inst Quantum Elect & Photon, CH-1015 Lausanne, Switzerland. Marti, DH, Ecole Polytech Fed Lausanne, Inst Quantum Elect & Photon, CH-1015 Lausanne, Switzerland., ISI Document Delivery No.: 773EB, Times Cited: 3, Cited Reference Count: 22, Cited References: , ALTMANN SL, 1994, POINT GROUP THEORY T, ATANASOV R, 1996, PHYS REV LETT, V76, P1703, BASTARD G, 1990, WAVE MECH APPL SEMIC, BHAT RDR, 2000, PHYS REV LETT, V85, P5432, BURT MG, 1992, J PHYS-CONDENS MAT, V4, P6651, BUTCHER PN, 1990, ELEMENTS NONLINEAR O, COTE D, 1999, APPL PHYS LETT, V75, P3959, DUPONT E, 1995, PHYS REV LETT, V74, P3596, FRASER JM, 1999, PHYS REV LETT, V83, P4192, HACHE A, 1997, PHYS REV LETT, V78, P306, HACHE A, 1998, IEEE J QUANTUM ELECT, V34, P1144, HAUG H, 1990, QUANTUM THEORY OPTIC, HUBNER J, 2003, PHYS REV LETT, V90, KRAL P, 2000, PHYS REV B, V61, P5381, LEITENSTORFER A, 1996, PHYS REV LETT, V76, P1545, LINDBERG M, 1988, PHYS REV B, V38, P3342, MOLENKAMP LW, 1988, PHYS REV B, V38, P4314, SELBMANN PE, 1998, PHYS STATUS SOLIDI B, V206, P219, STEVENS MJ, 2002, J APPL PHYS, V91, P4382, STEVENS MJ, 2003, PHYS REV LETT, V90, STIPPLER J, 2000, PHYS STATUS SOLIDI B, V221, P379, VANDRIEL HM, UNPUB, 035335
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