Journal
SUPERLATTICES AND MICROSTRUCTURES
Volume 108, Issue -, Pages 64-72Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2016.12.047
Keywords
Spin transfer torque; Optical Stark effect; Fano resonance
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Funding
- EU Marie Curie Initial Training Network INDEX
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We study the spin transfer torque (STT) induced onto a nanomagnet as a spin-polarized current flows through a junction made of the magnet sandwiched between two semiconductors. This junction is one-dimensional and highly idealized, the thin magnetic layer being mimicked by a spin-dependent contact force. We show that the STT may be externally controlled by shining the junction at sub-bandgap frequency with an intense laser beam. The excitonic coherence driven by the laser dresses the virtual electron-hole pairs coupling conduction and valence bands and inducing evanescent waves at the junction interface. The Fano-like quantum interference between these localized states and the continuum spectrum, being different in the two spin channels, significantly affects the STT. (C) 2017 Elsevier Ltd. All rights reserved.
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