title: The evaluation of non-topological components in Berry phase and momentum relaxation time in a gapped 3D topological insulator.
abstract: The zero gap surface states of a 3D-topological insulator host Dirac fermions with spin locked to the momentum. The gap-less Dirac fermions exhibit electronic behaviour different from those predicted in conventional materials. While calculations based on a simple linear dispersion can account for observed experimental patterns, a more accurate description of the physics of these systems and a better agreement between experimental data theoretical results can be obtained by including higher order k terms in the Hamiltonian. In this work, in presence of a time reversal symmetry breaking external magnetic field and higher order warping term, alteration to the topologically ordained Berry phase of (2n + 1)π, momentum relaxation time, and the magneto-conductivity tensors is established. The relation between scattering times and the deviations to topological Berry phase of π is also emphasized.
authors.affiliation: Department of Electrical and Computer Engineering and Material Science Division, Boston University, Boston, MA 02215, USA.
authors.forename: Parijat
authors.initials: P
authors.lastname: Sengupta
authors.forename: Gerhard
authors.initials: G
authors.lastname: Klimeck
authors.forename: Enrico
authors.initials: E
authors.lastname: Bellotti