Aging and reduced bulk conductance in thin films of the topological insulator Bi$_2$Se$_3$

Autor:	Aguilar, R. Valdés, Wu, L., Stier, A. V., Bilbro, L. S., Brahlek, M., Bansal, N., Oh, S., Armitage, N. P.
Rok vydání:	2012
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Journal of Applied Physics, 113, 153702 (2013)
Druh dokumentu:	Working Paper
DOI:	10.1063/1.4801911
Popis:	We report on the effect of exposure to atmospheric conditions on the THz conductivity of thin films of the topological insulator Bi$_2$Se$_3$. We find: 1) two contributions of mobile charge carriers to the THz conductivity immediately after growth, and 2) the spectral weight of the smaller of these decays significantly over a period of several days as the film is exposed to ambient conditions, while the other remains relatively constant. We associate the former with a bulk response, and the latter with the surface. The surface response exhibits the expected robustness of the carriers from 2D topological surface states. We find no evidence for a third spectral feature derived from topologically trivial surface states. Comment: 3 pages, 3 figures. 4 pages, modified text
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1202.1249 Zobrazit plný text záznamu View this record from Arxiv