Spinodal Superlattices of Topological Insulators

Spinodal Superlattices of Topological Insulators

Spinodal decomposition is proposed for stabilizing self-assembled interfaces between topological insulators (TIs) by combining layers of iso-structural and iso-valent TlBiX2 (X = S, Se, Te) materials. The composition range for gapless states is addressed concurrently to the study of thermodynamically driven boundaries. By tailoring composition, the TlBiS2−TlBiTe2 system might produce both spino...

Enhancement of surface photocurrents in topological insulators using magnetic superlattices

The gapless surface states of topological insulators (TI) can potentially be used to detect and harvest low-frequency infrared light. Nonetheless, it was shown that significant surface photocurrents due to light with frequency below the bulk gap are rather hard to produce. Here we demonstrate that a periodic magnetic pattern added to the surface dramatically enhances surface photocurrents in TI...

Lighting up topological insulators: large surface photocurrents from magnetic superlattices

Netanel H. Lindner,1 Aaron Farrell,2, 3 Eran Lustig,1 Felix von Oppen,4 and Gil Refael3 Department of Physics, Technion, Haifa 32000, Israel Department of Physics and the Centre for Physics of Materials, McGill University, Montreal, Quebec, Canada H3A 2T8 Institute of Quantum Information and Matter, Dept. of Physics, Caltech, Pasadena, CA 91125 Dahlem Center for Complex Quantum Systems and Fach...

Topological insulators

Topological crystalline insulators.

The recent discovery of topological insulators has revived interest in the band topology of insulators. In this Letter, we extend the topological classification of band structures to include certain crystal point group symmetry. We find a class of three-dimensional "topological crystalline insulators" which have metallic surface states with quadratic band degeneracy on high symmetry crystal sur...