中国物理B ›› 2021, Vol. 30 ›› Issue (5): 57801-057801.doi: 10.1088/1674-1056/abeee3

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Thermally induced band hybridization in bilayer-bilayer MoS2/WS2 heterostructure

Yanchong Zhao(赵岩翀)1,2, Tao Bo(薄涛)1,3, Luojun Du(杜罗军)4, Jinpeng Tian(田金朋)1,2, Xiaomei Li(李晓梅)1,2, Kenji Watanabe5, Takashi Taniguchi6, Rong Yang(杨蓉)1,3,7, Dongxia Shi(时东霞)1,2,7,‡, Sheng Meng(孟胜)1,2,3, Wei Yang(杨威)1,2,3,7,§, and Guangyu Zhang(张广宇)1,2,3,7,¶   

  1. 1 Beijing National Laboratory for Condensed Matter Physics;Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4 Department of Electronics and Nanoengineering, Aalto University, Tietotie 3, FI-02150, Finland;
    5 Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;
    6 International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;
    7 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China
  • 收稿日期:2021-03-03 修回日期:2021-03-12 接受日期:2021-03-16 出版日期:2021-05-14 发布日期:2021-05-14
  • 通讯作者: Dongxia Shi, Wei Yang, Guangyu Zhang E-mail:dxshi@aphy.iphy.ac.cn;wei.yang@iphy.ac.cn;gyzhang@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2020YFA0309604), the National Natural Science Foundation of China (Grant Nos. 11834017, 61888102, and 12074413), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos. XDB30000000 and XDB33000000), the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0101340001), and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G11).

Thermally induced band hybridization in bilayer-bilayer MoS2/WS2 heterostructure

Yanchong Zhao(赵岩翀)1,2, Tao Bo(薄涛)1,3, Luojun Du(杜罗军)4, Jinpeng Tian(田金朋)1,2, Xiaomei Li(李晓梅)1,2, Kenji Watanabe5, Takashi Taniguchi6, Rong Yang(杨蓉)1,3,7, Dongxia Shi(时东霞)1,2,7,‡, Sheng Meng(孟胜)1,2,3, Wei Yang(杨威)1,2,3,7,§, and Guangyu Zhang(张广宇)1,2,3,7,¶   

  1. 1 Beijing National Laboratory for Condensed Matter Physics;Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4 Department of Electronics and Nanoengineering, Aalto University, Tietotie 3, FI-02150, Finland;
    5 Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;
    6 International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;
    7 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China
  • Received:2021-03-03 Revised:2021-03-12 Accepted:2021-03-16 Online:2021-05-14 Published:2021-05-14
  • Contact: Dongxia Shi, Wei Yang, Guangyu Zhang E-mail:dxshi@aphy.iphy.ac.cn;wei.yang@iphy.ac.cn;gyzhang@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2020YFA0309604), the National Natural Science Foundation of China (Grant Nos. 11834017, 61888102, and 12074413), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos. XDB30000000 and XDB33000000), the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0101340001), and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G11).

摘要: Transition metal dichalcogenides (TMDs), being valley selectively, are an ideal system hosting excitons. Stacking TMDs together to form heterostructure offers an exciting platform to engineer new optical and electronic properties in solid-state systems. However, due to the limited accuracy and repetitiveness of sample preparation, the effects of interlayer coupling on the electronic and excitonic properties have not been systematically investigated. In this report, we study the photoluminescence spectra of bilayer-bilayer MoS2/WS2 heterostructure with a type Ⅱ band alignment. We demonstrate that thermal annealing can increase interlayer coupling in the van der Waals heterostructures, and after thermally induced band hybridization such heterostructure behaves more like an artificial new solid, rather than just the combination of two individual TMD components. We also carry out experimental and theoretical studies of the electric controllable direct and indirect infrared interlayer excitons in such system. Our study reveals the impact of interlayer coupling on interlayer excitons and will shed light on the understanding and engineering of layer-controlled spin-valley configuration in twisted van der Waals heterostructures.

关键词: two-dimensional materials, transition metal dichalcogenides (TMDs) heterostructure, band hybridization, interlayer exciton

Abstract: Transition metal dichalcogenides (TMDs), being valley selectively, are an ideal system hosting excitons. Stacking TMDs together to form heterostructure offers an exciting platform to engineer new optical and electronic properties in solid-state systems. However, due to the limited accuracy and repetitiveness of sample preparation, the effects of interlayer coupling on the electronic and excitonic properties have not been systematically investigated. In this report, we study the photoluminescence spectra of bilayer-bilayer MoS2/WS2 heterostructure with a type Ⅱ band alignment. We demonstrate that thermal annealing can increase interlayer coupling in the van der Waals heterostructures, and after thermally induced band hybridization such heterostructure behaves more like an artificial new solid, rather than just the combination of two individual TMD components. We also carry out experimental and theoretical studies of the electric controllable direct and indirect infrared interlayer excitons in such system. Our study reveals the impact of interlayer coupling on interlayer excitons and will shed light on the understanding and engineering of layer-controlled spin-valley configuration in twisted van der Waals heterostructures.

Key words: two-dimensional materials, transition metal dichalcogenides (TMDs) heterostructure, band hybridization, interlayer exciton

中图分类号:  (Optical properties of specific thin films)

  • 78.66.-w
73.40.-c (Electronic transport in interface structures)