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2D Materials Forum (Feb 2017)

Speaker: 
Junyong Wang
Date: 
Thu, 23/02/2017 - 11:30am
Location: 
S16 Level 6 - Theory conference room
Event Type: 
Seminars

Title 

"Investigation of crystal anisotropy of few-layer semimetallic T'-MoTe2 by angle-resolved polarized Raman spectroscopy"

Abstract

The distorted octahedral T’ phase MoTe2 has received tremendous interests recently due to its novel electronic structures and anisotropic charge transport properties. Taking advantage of its reduced in-plane symmetry, we find an easy and non-destructive method for determining the crystal orientation for thin layer T’-MoTe2 flakes by Raman spectroscopy. The Bg and Ag modes show blue-shift and red-shift with increasing thickness, respectively, due to the anisotropic surface effect. By exploring the anisotropic Raman response of thin layer T’-MoTe2 based on angle-resolved polarized Raman spectroscopy, we found four types of angular dependent behaviors, which are further analyzed from the group theory. The intensity of Ag mode at around 162 cm-1 reaches its maximum when the polarized excitation laser is parallel to the metal-metal bonds direction in the parallel configuration. This study paves the way for investigation about correlation between physical and structural properties of thin film T’-MoTe2.

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