Work

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

Year: 2012

Type: article

Abstract: 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 metastable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10 ps. 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.108.117403

Authors: J. A. Sobota, S. Yang, J. G. Analytis, Y. L. Chen, I. R. Fisher, P. S. Kirchmann, Z.-X. Shen

Institutions: SLAC National Accelerator Laboratory, Stanford University, Max Planck Society, Fritz Haber Institute of the Max Planck Society

Language: English

Topic: Topological Materials and Phenomena

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Basic Energy Sciences

OpenAlex ID: W2111459622

FWCI: 13.79

Cites: 37

Cited by: 376

Related to: 10