Temperature-dependent phonon shifts in monolayer MoS2

Nicholas A. Lanzillo; A. Glen Birdwell; Matin Amani; Frank J. Crowne; Pankaj B. Shah; Sina Najmaei; Zheng Liu; Pulickel M. Ajayan; Jun Lou; Madan Dubey; Saroj K. Nayak; Terrance P. O'Regan

doi:10.1063/1.4819337

Temperature-dependent phonon shifts in monolayer MoS₂

Nicholas A. Lanzillo, A. Glen Birdwell, Matin Amani, Frank J. Crowne, Pankaj B. Shah, Sina Najmaei, Zheng Liu, Pulickel M. Ajayan, Jun Lou, Madan Dubey, Saroj K. Nayak, Terrance P. O'Regan

Research output: Contribution to journal › Article › peer-review

217 Citations (Scopus)

Abstract

We present a combined experimental and computational study of two-dimensional molybdenum disulfide and the effect of temperature on the frequency shifts of the Raman-active E 2 g and A 1 g modes in the monolayer. While both peaks show an expected red-shift with increasing temperature, the frequency shift is larger for the A 1 g mode than for the E 2 g mode. This is in contrast to previously reported bulk behavior, in which the E 2 g 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.

Original language	English
Article number	093102
Journal	Applied Physics Letters
Volume	103
Issue number	9
DOIs	https://doi.org/10.1063/1.4819337
Publication status	Published - Aug 26 2013
Externally published	Yes

ASJC Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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title = "Temperature-dependent phonon shifts in monolayer MoS2",

abstract = "We present a combined experimental and computational study of two-dimensional molybdenum disulfide and the effect of temperature on the frequency shifts of the Raman-active E 2 g and A 1 g modes in the monolayer. While both peaks show an expected red-shift with increasing temperature, the frequency shift is larger for the A 1 g mode than for the E 2 g mode. This is in contrast to previously reported bulk behavior, in which the E 2 g 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.",

author = "Lanzillo, {Nicholas A.} and {Glen Birdwell}, A. and Matin Amani and Crowne, {Frank J.} and Shah, {Pankaj B.} and Sina Najmaei and Zheng Liu and Ajayan, {Pulickel M.} and Jun Lou and Madan Dubey and Nayak, {Saroj K.} and O'Regan, {Terrance P.}",

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T1 - Temperature-dependent phonon shifts in monolayer MoS2

AU - Lanzillo, Nicholas A.

AU - Glen Birdwell, A.

AU - Amani, Matin

AU - Crowne, Frank J.

AU - Shah, Pankaj B.

AU - Najmaei, Sina

AU - Liu, Zheng

AU - Ajayan, Pulickel M.

AU - Lou, Jun

AU - Dubey, Madan

AU - Nayak, Saroj K.

AU - O'Regan, Terrance P.

PY - 2013/8/26

Y1 - 2013/8/26

N2 - We present a combined experimental and computational study of two-dimensional molybdenum disulfide and the effect of temperature on the frequency shifts of the Raman-active E 2 g and A 1 g modes in the monolayer. While both peaks show an expected red-shift with increasing temperature, the frequency shift is larger for the A 1 g mode than for the E 2 g mode. This is in contrast to previously reported bulk behavior, in which the E 2 g 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.

AB - We present a combined experimental and computational study of two-dimensional molybdenum disulfide and the effect of temperature on the frequency shifts of the Raman-active E 2 g and A 1 g modes in the monolayer. While both peaks show an expected red-shift with increasing temperature, the frequency shift is larger for the A 1 g mode than for the E 2 g mode. This is in contrast to previously reported bulk behavior, in which the E 2 g 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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Temperature-dependent phonon shifts in monolayer MoS₂

Abstract

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