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Observation of Floquet-Bloch States on the Surface of a Topological Insulator

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Using time- and angle-resolved photoemission spectroscopy, we show that an intense ultrashort mid-infrared pulse with energy below the bulk band gap hybridizes with the surface Dirac fermions of a topological insulator to form Floquet-Bloch bands.

© 2014 Optical Society of America

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