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Temperature-dependent Phonon Shifts in Monolayer MoS2

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arxiv 1307.2447 v1 pith:6HVBCG7F submitted 2013-07-09 cond-mat.mes-hall cond-mat.mtrl-sci

Nicholas Lanzillo , A. Glen Birdwell , Matin Amani , Frank J. Crowne , Pankaj B. Shah , Sina Najmaei , Zheng Liu , Pulickel M. Ajayan
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Jun Lou Madan Dubey Saroj K. Nayak Terrance P. O'Regan
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classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords temperaturefrequencyshiftslargermodemonolayermos2phonon
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We present a combined experimental and computational study of two-dimensional molybdenum disulfde (MoS2) and the effect of temperature on the frequency shifts of the Raman-active E2g and A1g modes in the monolayer. While both peaks show an expected red-shift with increasing temperature, the frequency shift is larger for the A1g more than for the E2g mode. This is in contrast to previously reported bulk behavior, in which the E2g mode shows a larger frequency shift with temperature. The temperature dependence of these phonon shifts is attributed to the anharmonic contributions to the ionic interaction potential in the two-dimensional system.

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