title: A quantum dot in topological insulator nanofilm.
abstract: We introduce a quantum dot in topological insulator nanofilm as a bump at the surface of the nanofilm. Such a quantum dot can localize an electron if the size of the dot is large enough, ≳5 nm. The quantum dot in topological insulator nanofilm has states of two types, which belong to two ('conduction' and 'valence') bands of the topological insulator nanofilm. We study the energy spectra of such defined quantum dots. We also consider intraband and interband optical transitions within the dot. The optical transitions of the two types have the same selection rules. While the interband absorption spectra have multi-peak structure, each of the intraband spectra has one strong peak and a few weak high frequency satellites.
authors.affiliation: Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA.
authors.forename: Thakshila M
authors.initials: TM
authors.lastname: Herath
authors.forename: Prabath
authors.initials: P
authors.lastname: Hewageegana
authors.forename: Vadym
authors.initials: V
authors.lastname: Apalkov
mesh_terms: D004553:Electric Conductivity; D004735:Energy Transfer; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D045663:Quantum Dots; D012666:Semiconductors; D013499:Surface Properties