Optical injection and detection of ballistic pure spin currents in Ge
نویسندگان
چکیده
Eric J. Loren, Brian A. Ruzicka, Lalani K. Werake, Hui Zhao, Henry M. van Driel, and Arthur L. Smirl Laboratory for Photonics and Quantum Electronics, 138 IATL, University of Iowa, Iowa City, Iowa 52242,USA Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA Department of Physics and Institute for Optical Sciences, University of Toronto, Toronto, Ontario M5S 1A7, Canada
منابع مشابه
Optical studies of ballistic currents in semiconductors [Invited]
We present a summary of recent studies of ballistic currents using nonlinear optical techniques. Quantum interference between oneand two-photon absorption pathways is used to inject and control ballistic currents in GaAs samples. With this, a pure charge current, pure spin current, or spin-polarized charge current can be injected by changing the polarization configuration of the two pump pulses...
متن کاملAll-optical injection and detection of ballistic charge currents in germanium
All optical techniques are used to inject and to study the relaxation dynamics of ballistic charge currents in clean germanium at room temperature without the application of external contacts or the use of externally applied fields. Ballistic currents are injected by the quantum interference between the transition amplitudes for direct one and two photon absorption of a pair of phase-locked and...
متن کاملAll optical injection and detection of ballistic charge and spin currents in gallium arsinide, germanium, and silicon
Approved: _________________________ Thesis Supervisor ________________________ Title and Department ________________________ Date ALL OPTICAL INJECTION AND DETECTION OF BALLISTIC CHARGE AND SPIN CURRENTS IN GALLIUM ARSINIDE, GERMANIUM, AND SILICON by Eric Justin Loren A thesis submitted in partial fulfillment of the requirements for the Doctor of Philosophy degree in Physics in the Graduate Col...
متن کاملQuantum interference control of ballistic pure spin currents in semiconductors.
We demonstrate all-optical quantum interference injection and control of a ballistic pure spin current (without an accompanying charge current) in GaAs/AlGaAs quantum wells, consisting of spin-up electrons traveling in one direction and spin-down electrons traveling in the opposite direction. This current is generated through quantum interference of one- and two-photon absorption of approximate...
متن کاملProduction, detection, storage and release of spin currents
BACKGROUND Quantum rings connected to ballistic circuits couple strongly to external magnetic fields if the connection is not symmetric. Moreover, properly connected rings can be used to pump currents in the wires giving raise to a number of interesting new phenomena. At half filling using a time-dependent magnetic field in the plane of the ring one can pump a pure spin current, excited by the ...
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