P2 Charge and spin transport in topological insulators
The goal of this project is to understand effects not included in the initial idealized descriptions of topological insulators, with the aim to control these perturbing effects, as well as to utilize them for novel structures. Effects to be considered are disorder in the bulk and on the surface, as well as electron-electron interactions. One relevant question is how the presence of bulk disorder affects the universal signatures of quantum transport in topological insulators. Surface disorder can be very relevant in experiments that involve “nanowires” or “flakes” of Bi2Se3 or related topological insulators, because these materials are layered, and only the 111 surface is known to be clean. A theoretical understanding of the effects of surface disorder may also be of interest to nontransport experiments on nanostructured topological insulators, compare project P3.
Contributers: Dr. Bjoern Sbierski, Thomas Kiendl
International Partner: Gil Refael, California Institute for Technology (Caltec)
M. Trescher, B. Sbierski, P. W. Brouwer, E. J. Bergholtz, Quantum transport in Dirac materials: signatures of tilted and anisotropic Dirac and Weyl cones, Phys. Rev. B 91, 115135 (2015), open access version: arXiv:1501.04034
E.J. Bergholtz, Z. Liu, M. Trescher, R. Moessner, and M. Udagawa, Topology and Interactions in a Frustrated Slab: Tuning from Weyl Semimetals to 𝒞>1 Fractional Chern Insulators, Phys. Rev. Lett. 114, 016806 (2015), open access version: arXiv:1408.3669
B. Sbierski and P.W. Brouwer, Z2 phase diagram of three-dimensional disordered topological insulator via scattering matrix approach, Phys. Rev. B 89, 155311 (2014), open access version: arXiv:1401.7461