期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.246603
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资金
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC04-94AL85000]
We use phase-resolved transient grating spectroscopy to measure the propagation of spin helices in a high mobility n-GaAs/AlGaAs quantum well with an applied in-plane electric field. At relatively low fields helical modes crossover from overdamped excitations where the spin-precession period exceeds the spin lifetime, to a regime of coherent propagation where several spin-precession periods can be observed. We demonstrate that the envelope of a spin polarization packet reaches a current-driven velocity of 10(7) cm s(-1) in an applied field of 70 V cm(-1). DOI: 10.1103/PhysRevLett.109.246603
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