Report
Multiband quasiparticle interference in the topological insulator Cu_(x)Bi_(2)Te_(3)
| العنوان: | Multiband quasiparticle interference in the topological insulator Cu_(x)Bi_(2)Te_(3) |
|---|---|
| المؤلفون: | van Heumen, E., van Dalum, G. A. R., Kaas, J., de Jong, N., Oen, J., Huang, Y. K., Mitchell, A. K., Fritz, L., Golden, M. S. |
| سنة النشر: | 2011 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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. Comment: Updated the discussion of results. New model for impurity scattering added to the discussion. Corrected labelling of some figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1110.4406 |
| رقم الانضمام: | edsarx.1110.4406 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |