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Time-resolved orbital angular momentum spectroscopy
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DOI：10.1063/1.4927321.png)
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We introduce pump-probe magneto-orbital spectroscopy, wherein Laguerre-Gauss optical pump pulses impart orbital angular momentum to the electronic states of a material and subsequent dynamics are studied with 100 fs time resolution. The excitation uses vortex modes that distribute angular momentum over a macroscopic area determined by the spot size, and the optical probe studies the chiral imbalance of vortex modes reflected off the sample. First observations in bulk GaAs yield transients that evolve on time scales distinctly different from population and spin relaxation, as expected, but with surprisingly large lifetimes. (C) 2015 AIP Publishing LLC.
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COHERENT TRANSFER
SPIN
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3.6
论文数:
10.4W
被引数:
17.8W
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