Session W31: Focus Session: Topological Insulators: Synthesis & Characterization - Quantum Transport & Nanostructures

11:15 AM–2:15 PM, Thursday, March 1, 2012
Room: 260

Chair: Seongshik Oh, Rutgers University

Abstract ID: BAPS.2012.MAR.W31.5

Abstract: W31.00005 : Surface-dominated conduction in a 6nm-thick Bi2Se3 thin

12:03 PM–12:15 PM

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Authors:

Liang He
(UCLA Electrical Engineering)

Xinxin Yu
(UCLA Electrical Engineering)

Xufeng Kou
(UCLA Electrical Engineering)

Murong Lang
(UCLA Electrical Engineering)

Kang L. Wang
(UCLA Electrical Engineering)

Faxian Xiu
(Iowa State University, Department of Electrical and Computer Engineering)

Marcus Teague
(CalTech, department of Physics)

Nai-Chang Yeh
(CalTech, department of Physics)

We report a direct observation of surface dominated conduction in an intrinsic Bi$_{2}$Se$_{3}$ thin film with a thickness of 6 quintuple layers (QLs) grown on lattice-matched CdS (0001) substrates by molecular beam epitaxy (MBE). Shubnikov-de Haas (SdH) oscillations from the topological surface states suggest that the Fermi level falls inside the bulk band gap and is 53 +/-5 meV above the Dirac point, in agreement with 70 +/- 20 meV obtained from scanning tunneling spectroscopies (STS). Our results demonstrate a great potential of producing genuine topological insulator devices using Dirac Fermions of the surface states.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.W31.5