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Thursday, August 14 • 11:00 - 13:00
Topological Insulators III

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Invited: Tomasz Story
Topological Phase Diagram of (PB,Sn)Se
Co-authors: Piotr Dziawa, Bogdan J. Kowalski, Andrzej Szczerbakow, Craig M. Polley, Thiagarajan Balasubramanian, Bastian M. Wojek, Oscar Tjernberg, Krzysztof Dybko, Michal Szot, Wojciech Knoff, Shiva Safaei, Perla Kacman, Ryszard Buczko

(Pb,Sn)Se and (Pb,Sn)Te IV-VI semiconductor alloys are topological crystalline insulators (TCIs) - new materials exhibiting topologically protected Dirac-like helical surface states. In the TCIs the inverted band ordering results from relativistic effects and the topological protection is warranted by crystalline symmetry. TCIs provide ways of controlling topological states by perturbations lowering the symmetry of crystal potential. In (Pb,Sn)Se the band inversion and the topological transition is observed at a specific Sn content, temperature and pressure. We applied angle- and spin-resolved photoemission technique to examine this topological transition for the (001) surface of bulk (Pb,Sn)Se monocrystals. In the inverted band structure regime we found Dirac-like in-gap states close to the X point of the surface Brillouin zone revealing also a vortical spin polarization texture. Based on spectroscopic observations we construct the composition - temperature topological phase diagram of (Pb,Sn)Se and compare it with tight-binding band structure calculations. P. Dziawa et al., Nat. Mat. 11, 1023 (2012); B.M. Wojek et al., Phys. Rev. B 87, 115106 (2013); S. Safaei et al., Phys. Rev. B 88, 045305 (2013).

Oral: Jack Alexander-Webber
Two Band Magneto-Transport in Exfoliated Thin Films of Cu0.2Bi2Se3
Co-authors: Jian Huang, Čestmír Drasar, Robin Nicholas, Amalia Coldea

Oral: K. Brunner
Molecular Beam Epitaxy & Structural Properties of Bi2Se3-Based Topological Insulator Layers
Co-authors: S. Schreyeck, N. V. Tarakina, U. Bass, S. Grauer, C. Schumacher, T. Borzenko, C. Bruene, H. Buhmann, C. Gould G. Karczewski, J. Geurts, L. W. Molenkamp

Oral: Joseph Hagmann
Structural, Magnetic, & Electronic Properties of Self-Assembled Bi2Se3/Bi2MnSe4 Multilayer Heterostructures
Co-authors: Xiang Li, Jonathan Leiner, Sergei Rouvimov, Tatyana Orlova, Suresh Vishwanath, Si-Ning Dong, Xinyu Liu, Curt Richter, David Seiler, Jacek Furdyna, Margaret Dobrowolska

Oral: Shayne Cairns
Topological Transport Studies of Ultrathin Sb Films
Co-authors: Chomani Gaspe, Kaushini Wickramasinghe, Tetsuya Mishima, Nolan Teasdale, Joel Keay, Michael Santos, Sheena Murphy

Oral: Tobias Herrmann
Room Temperature High Frequency Transport of Dirac Fermions in Epitaxially Grown Sb2Te3 Based Topological Insulators 
Co-authors: Peter Olbrich, Leonid E. Golub, Sergey N. Danilov, Helene Plank, Vasily Bel'kov, Gregor Mussler, Christian Weyrich, Claus M. Schneider, Jörn Kampmeier, Detlev Grützmacher, Lukasz Plucinski, Markus Eschbach, Sergey D. Ganichev 


Session Chairs

Connie Li

Research Scientist, Naval Research Laboratory
Connie H. Li is a staff research scientist in the Magnetoelectronic Materials & Devices section in the Materials Science & Technology Divison at the Naval Research Laboratory (NRL), Washington, DC. She received her B.S. and Ph.D. in 1998 and 2002 from the University of California, Los Angeles (UCLA), working on compound semiconductor surface reactions at an atomic scale in metal organic vapor phase epitaxy (MOVPE), during which she was... Read More →


Tomasz Story

Institute of Physics PAS
Prof. Tomasz Story is Head of Semiconductor Physics Department of Institute of Physics of Polish Academy of Sciences in Warsaw (Poland). His research activities cover: carrier-induced ferromagnetism in semiconductors, thermoelectric energy conversion in narrow-gap semiconductors, and topological crystalline insulators.

Thursday August 14, 2014 11:00 - 13:00
Room 19A

Attendees (9)