Phase effects due to previous pulses in time-resolved Faraday rotation measurements

Journal Article · Sat Feb 14 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4907912· OSTI ID:22413089

Trowbridge, Christopher J.; Sih, Vanessa ^[1]

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1. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

Time-resolved Faraday rotation measurements have proved transformative in the investigation of spin dynamics in semiconductors. In materials with spin lifetimes which are on the order of, or greater than, the laser repetition time, the collective effect of spin polarization due to the whole pump pulse train becomes important. Here, we discuss a relative phase shift which results from these spins. We derive and experimentally validate a closed-form expression which describes this phase shift and characterize it throughout parameter space. A spin lifetime measurement based on this phase shift is described, and we discuss situations in which the model used must be augmented to be applicable.

• OSTI ID: 22413089
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FARADAY EFFECT
LIFETIME
MATHEMATICAL MODELS
PHASE SHIFT
PULSES
PUMPING
SEMICONDUCTOR MATERIALS
SPIN
SPIN ORIENTATION
TIME RESOLUTION