This work deals with the generation of coherent electronic excitations in solid state systems using ultrashort laser pulses. For the first time the optical injection of ballistic currents in a single semiconductor nanowire is realized via superposition of single and two-photon-absorption. The direction of the currents, persisting only for a few 100 femtoseconds, is controlled optically. Additionally oscillatory electronic states at gold surfaces are investigated. For the optical excitation novel grating couplers are developed that allow for fast electronic switching in the nanosecond regime. The research is valuable for the development of new semiconductor devices.
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This work deals with the generation of coherent electronic excitations in solid state systems using ultrashort laser pulses. For the first time the optical injection of ballistic currents in a single semiconductor nanowire is realized via superposition of single and two-photon-absorption. The direction of the currents, persisting only for a few 100 femtoseconds, is controlled optically. Additionally oscillatory electronic states at gold surfaces are investigated. For the optical excitation nove...
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