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Title: Temperature dependent Raman scattering studies of three dimensional topological insulators Bi{sub 2}Se{sub 3}

We investigate the temperature dependent (83 K≤T≤523 K) frequency shift of 2A{sub g}{sup 1} and 1E{sub g}{sup 2} phonon modes in the three dimensional topological insulator Bi{sub 2}Se{sub 3}, using Raman spectroscopy. The high quality single crystals of Bi{sub 2}Se{sub 3} 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 A{sub g}{sup 1} and A{sub g}{sup 2} phonon modes which confirms the good quality single crystals of Bi{sub 2}Se{sub 3}. Temperature co-efficient for A{sub 1g}{sup 1}, E{sub g}{sup 2}, and A{sub 1g}{sup 2} modes was estimated to be −1.44 × 10{sup −2}, −1.94 × 10{sup −2}, and −1.95 × 10{sup −2} cm{sup −1}∕K, respectively. Our results shed light on anharmonic properties of Bi{sub 2}Se{sub 3}.
Authors:
;  [1] ; ; ; ;  [2] ;  [2] ;  [3]
  1. Department of Physics, Indian Institute of Technology Delhi (IITD), New Delhi 110016 (India)
  2. Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22273466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH SELENIDES; DIFFRACTION; MONOCRYSTALS; PHONONS; POLARIZATION; RAMAN SPECTROSCOPY; RED SHIFT; RESOLUTION; TEMPERATURE DEPENDENCE; THREE-DIMENSIONAL CALCULATIONS; TRANSMISSION ELECTRON MICROSCOPY; VISIBLE RADIATION