中国物理B ›› 2018, Vol. 27 ›› Issue (2): 28103-028103.doi: 10.1088/1674-1056/27/2/028103
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
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)
Xiao-Qiang Xie(解晓强)1, Ying-Zi Peng(彭英姿)1,2, Qi-Ye Zheng(郑奇烨)1, Yuan Li(李源)1,2, Ji Chen(陈吉)1
摘要: In our experiment, an atomic layer MoS2 structure grown on SiO2/Si substrates is used in transport test. The voltage U14,23 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 U14,23 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.
中图分类号: (Nanoscale materials and structures: fabrication and characterization)