Title |
Acoustically-Driven Trion and Exciton Modulation in Piezoelectric Two-Dimensional MoS2
|
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Published in |
Nano Letters, January 2016
|
DOI | 10.1021/acs.nanolett.5b02826 |
Pubmed ID | |
Authors |
Amgad R. Rezk, Benjamin Carey, Adam F. Chrimes, Desmond W. M. Lau, Brant C. Gibson, Changxi Zheng, Michael S. Fuhrer, Leslie Y. Yeo, Kourosh Kalantar-zadeh |
Abstract |
By exploiting the very recent discovery of the piezoelectricity in odd-numbered layers of two-dimensional molybdenum disulfide (MoS2), we show the possibility of reversibly tuning the photoluminescence of single and odd-numbered multilayered MoS2 using high frequency sound wave coupling. We observe a strong quenching in the photoluminescence associated with the dissociation and spatial separation of electrons-holes quasi-particles at low applied acoustic powers. At the same applied powers, we note a relative preference for ionization of trions into excitons. This work also constitutes the first visual presentation of the surface displacement in one-layered MoS2 using laser Doppler vibrometry. Such observations are associated with the acoustically generated electric field arising from the piezoelectric nature of MoS2 for odd-numbered layers. At larger applied powers, the thermal effect dominates the behavior of the two-dimensional flakes. Altogether, the work reveals several key fundamentals governing acousto-optic properties of odd-layered MoS2 that can be implemented in future optical and electronic systems. |
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