Observation of oscillations in the transport for atomic layer MoS2

doi:10.1088/1674-1056/27/2/028103

Abstract In our experiment, an atomic layer MoS₂ structure grown on SiO₂/Si substrates is used in transport test. The voltage U_14,23 oscillates and the corresponding period varies with applied current. The largest period appears at 45 μA. The oscillation periods are different when samples are under laser radiation or in darkness. We discover that under the laser irradiation, the oscillation period occurs at lower current than in the darkness case. Meanwhile, the drift velocity is estimated at~10⁷ cm/s. Besides, by studying the envelope of U_14,23 versus applied current, we see a beating phenomenon at a certain current value. The beating period in darkness is larger than under laser irradiation. The difference between beating periods reveals the energy difference of electrons. Similar results are obtained by using different laser power densities and different light sources. The possible mechanism behind the oscillation period is discussed.

Keywords: atomic-layer MoS₂ oscillations in the transport circular polarized light photo-excited carriers

Received: 07 July 2017
Revised: 09 November 2017
Accepted manuscript online:

PACS:	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	73.23.-b	(Electronic transport in mesoscopic systems)
	68.65.-k	(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)

Fund: Project supported by the Zhejiang Provincial Natural Science Foundation, China (Grant Nos. LY16F040003 and LY16A040007) and the National Natural Science Foundation of China (Grant Nos. 51401069 and 11204058).

Corresponding Authors: Ying-Zi Peng
E-mail: yingzip@hdu.edu.cn

About author: 81.07.-b; 73.23.-b; 68.65.-k

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Xiao-Qiang Xie(解晓强), Ying-Zi Peng(彭英姿), Qi-Ye Zheng(郑奇烨), Yuan Li(李源), Ji Chen(陈吉) Observation of oscillations in the transport for atomic layer MoS₂ 2018 Chin. Phys. B 27 028103

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[1]	Characterization of atomic-layer MoS₂ synthesized using a hot filament chemical vapor deposition method Ying-Zi Peng(彭英姿), Yang Song(宋扬), Xiao-Qiang Xie(解晓强), Yuan Li(李源), Zheng-Hong Qian(钱正洪), Ru Bai(白茹). Chin. Phys. B, 2016, 25(5): 058104.

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Observation of oscillations in the transport for atomic layer MoS₂