Topological Insulators: Materials – Fundamental Properties – Devices

Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials

In this review, we discuss recent progress in the explorations of topological materials beyond topological insulators; specifically, we focus on topological crystalline insulators and bulk topological superconductors. The basic concepts, model Hamiltonians, and novel electronic properties of these new topological materials are explained. The key role of symmetries that underlie their topologica...

Pure spin current devices based on ferromagnetic topological insulators

Two-dimensional topological insulators possess two counter propagating edge channels with opposite spin direction. Recent experimental progress allowed to create ferromagnetic topological insulators realizing a quantum anomalous Hall (QAH) state. In the QAH state one of the two edge channels disappears due to the strong ferromagnetic exchange field. We investigate heterostructures of topologica...

Focus on materials science of topological insulators and superconductors

Akihiro Tanaka and Taizo Sasaki National Institute for Materials Science, Japan In a March 1997 article in Physics Today [1], Gerald Mahan, Brian Sales and Jeff Sharp write on what they deem a ‘new approach to an old problem’. The subject is thermoelectric materials, which is indeed an old problem, predating the inception of modern solid state physics itself: thermoelectric refrigeration using ...

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...