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Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3

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arxiv 1203.3616 v1 pith:PEFDMOKQ submitted 2012-03-16 cond-mat.mtrl-sci cond-mat.mes-hall

Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3

Jonathan A. Sobota , Shuolong Yang , James G. Analytis , Yulin Chen , Ian R. Fisher , Patrick S. Kirchmann , Z.-X. Shen This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords populationbi2se3statesurfacebulkconductiondiracexcitation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using femtosecond time- and angle- resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi2Se3. We studied p-type Bi2Se3, in which the metallic Dirac surface state and bulk conduction bands are unoccupied. Optical excitation leads to a meta-stable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10ps. This unusually long-lived population of a metallic Dirac surface state with spin texture may present a channel in which to drive transient spin-polarized currents.

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