A quantum dot in topological insulator nanofilm

作者：Herath Thakshila M^*; Hewageegana Prabath; Apalkov Vadym

来源：Journal of Physics: Condensed Matter , 2014, 26(11): 115302.

DOI：10.1088/0953-8984/26/11/115302

• quantum dot
• topological insulator
• absorption spectrum

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, greater than or similar to 5 nm. The quantum dot in topological insulator nanofilm has states of two types, which belong to two (%26apos;conduction%26apos; and %26apos;valence%26apos;) 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.

• 出版日期2014-3-19