The evaluation of non-topological components in Berry phase and momentum relaxation time in a gapped 3D topological insulator. (4th August 2015)

• Record Type: Journal Article
• Authors: Sengupta, Parijat; Klimeck, Gerhard; Bellotti, Enrico
• Is Part Of: Journal of physics. Volume 27:Number 33(2015)
• Publication Date: 2015-08-04
• Subjects: 3D topological insulator -- Berry phase -- momentum relaxation time; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/33/335505
• Languages: English
• ISSNs: 0953-8984

Abstract

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 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, momentum relaxation time, and the magneto-conductivity tensors is established. The relation between scattering times and the deviations to topological Berry phase of is also emphasized.