1. Temperature dependent Raman scattering studies of three dimensional topological insulators Bi2Se3.
- Author
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Irfan, Bushra, Sahoo, Satyaprakash, Gaur, Anand P. S., Ahmadi, Majid, Guinel, Maxime J.-F., Katiyar, Ram S., and Chatterjee, Ratnamala
- Subjects
RAMAN effect ,SPECTRUM analysis ,CRYSTALLOGRAPHY ,PARTICLES (Nuclear physics) ,NUCLEAR physics - Abstract
We investigate the temperature dependent (83K ⩽ T ⩽ 523K) frequency shift of 2A
1 g and 1E2 g phonon modes in the three dimensional topological insulator Bi2 Se3 , using Raman spectroscopy. The high quality single crystals of Bi2 Se3 were grown using a modified Bridgman technique and characterized by Laue diffraction and high resolution transmission electron microscopy. A significant broadening in the line shape and red-shift in the frequencies were observed with increase in temperature. Polarized Raman scattering measurement shows a strong polarization effect of A1 g and A2 g phonon modes which confirms the good quality single crystals of Bi2 Se3 . Temperature co-efficient for A1 1g ; E2 g , and A2 1g modes was estimated to be -1.44 × 10-2 , -1.94 ×10-2 , and -1.95 ×10-2 cm-1 /K, respectively. Our results shed light on anharmonic properties of Bi2 Se3 . [ABSTRACT FROM AUTHOR]- Published
- 2014
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