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Review Article

Interlayer exciton dynamics of transition metal dichalcogenide heterostructures under electric fields

Jian Tang1, Yue Zheng1, Ke Jiang1, Qi You1, Zhentian Yin1, Zihao Xie1, Henan Li2, Cheng Han1( ), Xiaoxian Zhang3( ), Yumeng Shi2( )
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China
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Graphical Abstract

We summarize the recent advances on the understanding of interlayer exciton dynamics under electric fields in transition metal dichalcogenide (TMDC) heterostructures. We put emphasis on the electrical modulation of interlayer excitons’ emission, the charge transport inside the heterostructure after the separation of interlayer excitons by an electric field, and the correlation physics of interlayer excitons and charges under electrical doping and tuning.

Abstract

Stacking single layers of atoms on top of each other provides a fundamental way to achieve novel material systems and engineer their physical properties, which offers opportunities for exploring fundamental physics and realizing next-generation optoelectronic devices. Among the two-dimensional (2D)-stacked systems, transition metal dichalcogenide (TMDC) heterostructures are particularly attractive because they host tightly-bonded interlayer excitons which possess various novel and appealing properties. These interlayer excitons have drawn significant research attention and hold high potential for the application in unique optoelectronic devices, such as polarization- and wavelength-tunable single photon emitters, valley Hall transistors, and possible high-temperature superconductors. The development of these devices requires a comprehensive understanding of the fundamental properties of these interlayer excitons and the impact of electric fields on their behaviors. In this review, we summarize the recent advances on the understanding of interlayer exciton dynamics under electric fields in TMDC heterostructures. We put emphasis on the electrical modulation of interlayer excitons’ emission, the valley Hall transport of charge carriers after the separation of interlayer excitons by an electric field, and the correlation physics of interlayer excitons and charges under electrical doping and tuning. Challenges and perspectives are finally discussed for the application of TMDC heterostructures in future optoelectronics.

Keywords

interlayer excitontransition metal dichalcogenide (TMDC) heterostructurescircular polarizationvalley Hall effectstrong coupling

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4555-4572
DOI: 10.1007/s12274-023-6325-3
Cite this article:
Tang J, Zheng Y, Jiang K, et al. Interlayer exciton dynamics of transition metal dichalcogenide heterostructures under electric fields. Nano Research, 2024, 17(5): 4555-4572. https://doi.org/10.1007/s12274-023-6325-3
Topics:
Layered semiconductors

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Received: 28 August 2023
Revised: 20 October 2023
Accepted: 07 November 2023
Published: 07 December 2023
© Tsinghua University Press 2023
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