Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells

S. Priyadarshi, A.M. Racu, K. Pierz, U. Siegner, M. Bieler, H.T. Duc, J. Förstner, T. Meier, Physical Review Letters 104 (2010).

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Abstract
It is demonstrated that valence-band mixing in GaAs quantum wells tremendously modifies electronic transport. A coherent control scheme in which ultrafast currents are optically injected into undoped GaAs quantum wells upon excitation with femtosecond laser pulses is employed. An oscillatory dependence of the injection current amplitude and direction on the excitation photon energy is observed. A microscopic theoretical analysis shows that this current reversal is caused by the coupling of the light- and heavy-hole bands and that the hole currents dominate the overall current response. These surprising consequences of band mixing illuminate fundamental physics as they are unique for experiments which are able to monitor electronic transport resulting from carriers with relatively large momenta.
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Publishing Year
Journal Title
Physical Review Letters
Volume
104
Issue
21
Article Number
217401
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Priyadarshi S, Racu AM, Pierz K, et al. Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells. Physical Review Letters. 2010;104(21). doi:10.1103/physrevlett.104.217401
Priyadarshi, S., Racu, A. M., Pierz, K., Siegner, U., Bieler, M., Duc, H. T., … Meier, T. (2010). Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells. Physical Review Letters, 104(21). https://doi.org/10.1103/physrevlett.104.217401
@article{Priyadarshi_Racu_Pierz_Siegner_Bieler_Duc_Förstner_Meier_2010, title={Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells}, volume={104}, DOI={10.1103/physrevlett.104.217401}, number={21217401}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Priyadarshi, S. and Racu, A. M. and Pierz, K. and Siegner, U. and Bieler, M. and Duc, H. T. and Förstner, Jens and Meier, Torsten}, year={2010} }
Priyadarshi, S., A. M. Racu, K. Pierz, U. Siegner, M. Bieler, H. T. Duc, Jens Förstner, and Torsten Meier. “Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells.” Physical Review Letters 104, no. 21 (2010). https://doi.org/10.1103/physrevlett.104.217401.
S. Priyadarshi et al., “Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells,” Physical Review Letters, vol. 104, no. 21, 2010.
Priyadarshi, S., et al. “Reversal of Coherently Controlled Ultrafast Photocurrents by Band Mixing in Undoped GaAs Quantum Wells.” Physical Review Letters, vol. 104, no. 21, 217401, American Physical Society (APS), 2010, doi:10.1103/physrevlett.104.217401.
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