Boundary states in 3-d Topological Insulators: Electroncross-section in presence of curvatature and defects

Datum

25.08.2011

Zeit

14:00 - 15:00

Sprecher

Prof. Dr. Arturo Tagliacozzo

Zugehörigkeit

University of Napoli, Dept. of Physics

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Grit Rötzer

Beschreibung

Topological Insulators are a new class of materials displaying protected gapless boundary states. I will discuss the effect of the curvature of the surface of a Topological Insulator and of the possible presence of a topological defect like a lattice dislocation, in the continuum, long wavelength, limit. A spin connection term shows up in the Dirac-like dispersion of the boundary states, in addition to the rotation of the Dirac matrices. Localized perturbing potentials like a bump in the surface or a lattice defect imply a cross-section for the electron and induce resistivity, which we have calculated within the Born approximation. I will also discuss under which conditions a vortex line piercing a Topological Superconductor sustains a Majorana bound state localized at the boundary. Majorana fermions are expected to be quite an interesting option for future quantum information protocols.

Letztmalig verändert: 25.08.2011, 09:35:08