Electrical Control of Optical Properties of Monolayer MoS$_2$

Autor:	Newaz, A. K. M., Prasai, D., Ziegler, J. I., Caudel, D., Robinson, S., Haglund Jr, R. F., Bolotin, K. I.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1016/j.ssc.2012.11.010
Popis:	We investigate electrical gating of photoluminescence and optical absorption in monolayer molybdenum disulfide (MoS$_2$) configured in field effect transistor geometry. We observe an hundredfold increase in photoluminescence intensity and an increase in absorption at ~660 nm in these devices when an external gate voltage is decreased from +50 V to -50 V, while the photoluminescence wavelength remains nearly constant. In contrast, in bilayer MoS$_2$ devices we observe almost no changes in photoluminescence with gate voltage. We propose that the differing responses of the monolayer and bilayer devices are related to the interaction of the excitons in MoS$_2$ with charge carriers. Comment: 5 pages, 4 figures. Supplementary Material included in source files
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1211.0341 Zobrazit plný text záznamu View this record from Arxiv