Optical detection of electron spin dynamics driven by fast variations of a magnetic field: a simple method to measure [Formula: see text], [Formula: see text], and [Formula: see text] in semiconductors.
Sci Rep
; 10(1): 13155, 2020 Aug 04.
Article
in En
| MEDLINE
| ID: mdl-32753635
ABSTRACT
We develop a simple method for measuring the electron spin relaxation times [Formula see text], [Formula see text] and [Formula see text] in semiconductors and demonstrate its exemplary application to n-type GaAs. Using an abrupt variation of the magnetic field acting on electron spins, we detect the spin evolution by measuring the Faraday rotation of a short laser pulse. Depending on the magnetic field orientation, this allows us to measure either the longitudinal spin relaxation time [Formula see text] or the inhomogeneous transverse spin dephasing time [Formula see text]. In order to determine the homogeneous spin coherence time [Formula see text], we apply a pulse of an oscillating radiofrequency (rf) field resonant with the Larmor frequency and detect the subsequent decay of the spin precession. The amplitude of the rf-driven spin precession is significantly enhanced upon additional optical pumping along the magnetic field.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Diagnostic_studies
Language:
En
Journal:
Sci Rep
Year:
2020
Document type:
Article
Publication country:
ENGLAND
/
ESCOCIA
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GB
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GREAT BRITAIN
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INGLATERRA
/
REINO UNIDO
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SCOTLAND
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UK
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UNITED KINGDOM