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Jeudi 03 July 2014, 14h
Amphi Holweck, Esc C, 1ème etage
Topological Surface States in the Kondo Insulator SmB6 ?
R. L. Greene
Center for Nanophysics and Advanced Materials (CNAM), University of Maryland
In 2010 it was predicted theoretically that some Kondo insulators could host topologically protected metallic surface states [1]. Very recent transport [2-4] and point contact spectroscopy [2] studies give strong evidence for a metallic surface state in the Kondo insulator SmB6. Other experiments, such as ARPES and torque magnetometry, give support for a topological surface state, but the “smoking gun” evidence has yet to be found. In this talk I will review the relevant experimental studies on SmB6 and discuss the present status of the proposed topological behavior.
[1] Dzero, Sun, Galitski, and Coleman, PRL 104, 106408 (2010).
[2] Zhang et al., PRX 3, 011011 (2013).
[3] Wolgast et al., Phys. Rev. B 88, 180405 (2013)
[4] D. J. Kim et al., Sci. Rep. 3 (2013)