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Ultrafast Semiconducting to Metallic Terahertz Responses in the Topological Insulator Bi2Se3

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Abstract

We present the photoinduced terahertz responses of topological insulators Bi2Se3. The photoconductance sign is determined by the competition between the topological surface state and the bulk response in n-type, p-type and bulk-insulating Bi2Se3.

© 2018 The Author(s)

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