期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.186403
关键词
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资金
- U.S. Department of Energy [DE-FG02-07ER46383]
- U.S. National Science Foundation [DMR-05-37588, DMR-09-06444]
- ACS
We have mapped out the spin texture of a Bi/Ag surface alloy prepared on a thin Ag film by circularly polarized angle-resolved photoemission spectroscopy. A term proportional to del . A in the interaction Hamiltonian gives rise to strong surface photoexcitation, which interferes with a Rashba contribution to yield a pronounced circular dichroic effect in Bi/Ag. The dipole transition, often taken to be the only important photoexcitation mechanism, is actually negligible. A parameter-free calculation yields a dichroic pattern in excellent agreement with experiment.
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