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Multiband quasiparticle interference in the topological insulator Cu_(x)Bi_(2)Te_(3)

by E. van Heumen, G. A. R. van Dalum, J. Kaas, N. de Jong, J. Oen, Y. K. Huang, A. K. Mitchell, L. Fritz, M. S. Golden

Submission summary

As Contributors: Erik van Heumen
Arxiv Link: https://arxiv.org/abs/1110.4406v3
Date submitted: 2019-04-26
Submitted by: van Heumen, Erik
Submitted to: SciPost Physics
Domain(s): Exp. & Theor.
Subject area: Condensed Matter Physics - Experiment

Abstract

We present angle resolved photoemission experiments and scanning tunneling spectroscopy results on the doped topological insulator Cu0.2Bi2Te3. Quasi-particle interference (QPI) measurements, based on high resolution conductance maps of the local density of states show that there are three distinct energy windows for quasi-particle scattering. Using a model Hamiltonian for this system two new scattering channels are identified: the first between the surface states and the conduction band and the second between conduction band states. We also observe that the real space density modulation has a predominant three-fold symmetry, which rules out a simple, isotropic impurity potential. We obtain agreement between experiment and theory by considering a modified scattering potential that is consistent with having mostly Bi-Te anti-site defects as scatterers.

Current status:
Editor-in-charge assigned

Submission & Refereeing History

Submission 1110.4406v3 on 26 April 2019

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