Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-01-28
PhysRevLett.107.207602 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.107.207602
A differential coupling of topological surface states to left- versus right-circularly polarized light is the basis of many opto-spintronics applications of topological insulators. Here we report direct evidence of circular dichroism from the surface states of Bi$_2$Se$_3$ using a laser-based time-of-flight angle-resolved photoemission spectroscopy. By employing a novel sample rotational analysis, we resolve unusual modulations in the circular dichroism photoemission pattern as a function of both energy and momentum, which perfectly mimic the predicted but hitherto un-observed three-dimensional warped spin-texture of the surface states. By developing a microscopic theory of photoemission from topological surface states, we show that this correlation is a natural consequence of spin-orbit coupling. These results suggest that our technique may be a powerful probe of the spin-texture of spin-orbit coupled materials in general.
Fu Liang
Gardner Dillon R.
Gedik Nuh
Hsieh David
Lee Young Sam
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