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Publication
Physical Review Letters
Paper
Surface intervalley scattering on GaAs(110): Direct observation with picosecond laser photoemission
Abstract
Angle-resolved laser photoemission investigations of the laser-excited GaAs(110) surface have revealed a previously unobserved valley of the C3 unoccupied surface band whose minimum is at X in the surface Brillouin zone. Electron population in this valley increases only as a result of scattering from the directly photoexcited valley at . With high momentum resolution, we have isolated the dynamic electron population changes at both and X and deduced the scattering time between the two valleys. © 1989 The American Physical Society.