Band evolution of two-dimensional transition metal dichalcogenides under electric fields

Peng Chen; Cai Cheng; Cheng Shen; Jing Zhang; Shuang Wu; Xiaobo Lu; Shuopei Wang; Luojun Du; Kenji Watanabe; Takashi Taniguchi; Jiatao Sun; Rong Yang; Dongxia Shi; Kaihui Liu; Sheng Meng; Guangyu Zhang

doi:10.1063/1.5093055

Band evolution of two-dimensional transition metal dichalcogenides under electric fields

Peng Chen, Cai Cheng, Cheng Shen, Jing Zhang, Shuang Wu, Xiaobo Lu, Shuopei Wang, Luojun Du, Kenji Watanabe, Takashi Taniguchi, Jiatao Sun, Rong Yang, Dongxia Shi, Kaihui Liu, Sheng Meng, Guangyu Zhang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Band engineering of two-dimensional transition metal dichalcogenides (2D TMDCs) is of great significance with regard to both fundamental exploration and practical application. Here we report on a study of the band evolution of monolayer and bilayer TMDCs (WS₂, WSe₂, and MoS₂) under vertical electric fields. Our results show that the electric field has a negligible influence on the bandgaps of monolayer TMDCs. For bilayer TMDCs, our results show that their intralayer direct bandgaps are also immune to the electric field. However, the indirect bandgaps of bilayer TMDCs can be effectively tuned by a vertical electric field. Interestingly, we find that the field tunability of the bandgap in bilayer WSe₂ is much larger than those in bilayer WS₂ and MoS₂.

Original language	English
Article number	083104
Journal	Applied Physics Letters
Volume	115
Issue number	8
DOIs	https://doi.org/10.1063/1.5093055
Publication status	Published - 19 Aug 2019
Externally published	Yes

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title = "Band evolution of two-dimensional transition metal dichalcogenides under electric fields",

abstract = "Band engineering of two-dimensional transition metal dichalcogenides (2D TMDCs) is of great significance with regard to both fundamental exploration and practical application. Here we report on a study of the band evolution of monolayer and bilayer TMDCs (WS2, WSe2, and MoS2) under vertical electric fields. Our results show that the electric field has a negligible influence on the bandgaps of monolayer TMDCs. For bilayer TMDCs, our results show that their intralayer direct bandgaps are also immune to the electric field. However, the indirect bandgaps of bilayer TMDCs can be effectively tuned by a vertical electric field. Interestingly, we find that the field tunability of the bandgap in bilayer WSe2 is much larger than those in bilayer WS2 and MoS2.",

author = "Peng Chen and Cai Cheng and Cheng Shen and Jing Zhang and Shuang Wu and Xiaobo Lu and Shuopei Wang and Luojun Du and Kenji Watanabe and Takashi Taniguchi and Jiatao Sun and Rong Yang and Dongxia Shi and Kaihui Liu and Sheng Meng and Guangyu Zhang",

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doi = "10.1063/1.5093055",

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T1 - Band evolution of two-dimensional transition metal dichalcogenides under electric fields

AU - Chen, Peng

AU - Cheng, Cai

AU - Shen, Cheng

AU - Zhang, Jing

AU - Wu, Shuang

AU - Lu, Xiaobo

AU - Wang, Shuopei

AU - Du, Luojun

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Sun, Jiatao

AU - Yang, Rong

AU - Shi, Dongxia

AU - Liu, Kaihui

AU - Meng, Sheng

AU - Zhang, Guangyu

PY - 2019/8/19

Y1 - 2019/8/19

N2 - Band engineering of two-dimensional transition metal dichalcogenides (2D TMDCs) is of great significance with regard to both fundamental exploration and practical application. Here we report on a study of the band evolution of monolayer and bilayer TMDCs (WS2, WSe2, and MoS2) under vertical electric fields. Our results show that the electric field has a negligible influence on the bandgaps of monolayer TMDCs. For bilayer TMDCs, our results show that their intralayer direct bandgaps are also immune to the electric field. However, the indirect bandgaps of bilayer TMDCs can be effectively tuned by a vertical electric field. Interestingly, we find that the field tunability of the bandgap in bilayer WSe2 is much larger than those in bilayer WS2 and MoS2.

AB - Band engineering of two-dimensional transition metal dichalcogenides (2D TMDCs) is of great significance with regard to both fundamental exploration and practical application. Here we report on a study of the band evolution of monolayer and bilayer TMDCs (WS2, WSe2, and MoS2) under vertical electric fields. Our results show that the electric field has a negligible influence on the bandgaps of monolayer TMDCs. For bilayer TMDCs, our results show that their intralayer direct bandgaps are also immune to the electric field. However, the indirect bandgaps of bilayer TMDCs can be effectively tuned by a vertical electric field. Interestingly, we find that the field tunability of the bandgap in bilayer WSe2 is much larger than those in bilayer WS2 and MoS2.

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VL - 115

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 8

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ER -

Band evolution of two-dimensional transition metal dichalcogenides under electric fields

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