Ultrafast charge transfer in dual graphene-WS$_{2}$ van der Waals quadrilayer heterostructures
Zong-Peng Song1,2,3 , Hai-Ou Zhu4 , Wen-Tao Shi1,2,3 , Da-Lin Sun1,2,3 , Shuang-Chen Ruan1**
1 Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 5180602 Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen University, Shenzhen 5180603 Guangdong Provincial Key Laboratory of Mico/Nano Optomechatronics Engineering, Shenzhen University, Shenzhen 5180604 College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118
Abstract ：Using dual graphene–WS$_{2}$ quadrilayer heterostructures as an example, we find that the ultrafast transfer of electrons from WS$_{2}$ to graphene takes place within 114 fs, and the Coulomb field of the charge can effectively affect the interlayer electron transfer. This effect illustrates that the charge transfer in such van der Waals heterostructures may be controlled by an externally applied electric field for promising applications in photoelectric devices.
收稿日期: 2018-07-16
出版日期: 2018-11-23
:
78.47.J-
(Ultrafast spectroscopy (<1 psec))
78.47.jb
(Transient absorption)
73.40.-c
(Electronic transport in interface structures)
42.70.-a
(Optical materials)
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