Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session D42: Topological Insulators: Experiment
2:30 PM–5:30 PM,
Monday, March 15, 2010
Sponsoring Unit: DMP
Chair: Dennis Drew, University of Maryland
Abstract ID: BAPS.2010.MAR.D42.11
Abstract: D42.00011 : Berry Phase Measurements of Topological Surface States*
4:30 PM–4:42 PM
Preview Abstract Abstract
Kenjiro K. Gomes
Hari C. Manoharan
(Department of Physics and SIMES, Stanford University)
In special two-dimensional systems, such as graphene and topological insulators, electrons can mimic the behavior of relativistic Dirac particles and exhibit a quantized Berry's phase of $\pi $. In this experiment we harness the power of complimentary interferometry methods to quantify the quantum phase present in pure antimony, a topological insulator parent matrix. We extract the Berry's phase from the quantum magneto-oscillations measured in low-temperature transport (Shubnikov-de Haas effect) and in local tunneling conductance (TMCO). We also combine scanning tunneling spectroscopy (STS) with band structure determined by angle-resolved photoemission spectroscopy (ARPES) to develop a novel technique for quantifying the Berry's phase of surface electrons. These techniques enable robust determination of the Berry's phase that can remarkably be extended to high magnetic fields, providing a new window on the dynamics of these unique spin-polarized carriers.
*Supported by the DOE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under contract DE-AC02-76SF00515.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.D42.11
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