Taunusstein, October 13th, 2016:
Scienta Omicron congratulates the Nobel laureates in Physics 2016: David J. Thouless University of Washington, Seattle, WA, USA F. Duncan M. Haldane Princeton University, NJ, USA J. Michael Kosterlitz Brown University, Providence, RI, USA
The Nobel Prize was awarded "for theoretical discoveries of topological phase transitions and topological phases of matter".
A topological insulator is a material that behaves as an insulator in its bulk but whose 2D surface contains conducting states. These exotic materials can potentially be used in device applications such as spintronics and quantum computing.
The field of "Topological insulators" is one of the hottest topics in condensed-matter physics today, and Angle Resolved Photoelectron Spectroscopy (ARPES) is a key technique in the investigations. In fact, when discovering the first topological insulator, Bi1-xSbx, Scienta Omicron ARPES analysers were used to probe the surface bands of the material (Hsieh et al. Nature 452(2009)06843).
ARPES is the critical tool to prove a material being a topological insulator or semimetal. Scienta Omicron pioneered the ARPES technique in 1994 with invention of the 2D detector and today continues to revolutionize ARPES with the patented DA30 spectrometer. Since the discovery of Bi1-xSbx several more topological insulators have been studied with ARPES. For a review see for example M. Z. Hasan and C. L. Kane. https://arxiv.org/abs/1002.3895v1.
ARPES maps the electron density as a function of energy and emission angle. Here, the use of the deflection mode in DA30 is very useful. An example measurement on a topological insulator is presented in Figure 1.
Scienta Omicron congratulates the Nobel laureates and is honoured to contribute to the exploration of these novel materials. For more information, please visit our website www.scientaomicron.com for links to ARPES publications, product information and application notes.
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