Peculiar electron-phonon coupling in hBN/WS<sub>2</sub> heterostructures

POSTER

Abstract

The electron-phonon coupling (EPC) in materials is the key to the fundamental research, underlying many novel quantum behaviors. van der Waals heterostructures (vdWHs) provide new platform to reveal the intrinsic interactions between electrons and phonons. Here we report the cross-dimensional EPC between the three-dimensional (3D) layer-breathing (LB) phonons in a thick hBN/WS2 vdWH up to hundreds of layers and two-dimensional (2D) electrons of its few-layer WS2 constituent. New LB modes are resonantly enhanced in hBN/WS2 vdWHs when the excitation energy approached the C exciton energy of WS2 constituent. This cross-dimensional EPC strength is consistent with the phonon wavefunction projection between the layer-extended bulk-like LB modes in hBN/WS2 vdWHs and the LB modes strongly coupled with the C exciton in the corresponding standalone WS2 flakes, which can be further confirmed by the interlayer bond polarizability model in vdWHs. This work suggests additional possibilities to manipulate EPC in vdWHs for new quantum phenomena.

Reference:
M.-L. Lin#, Y. Zhou#, et al, Nat. Commun. 2019, 10, 2419

*National Key Research and Development Program of China (Grant Nos 2016YFA0301204);
National Natural Science Foundation of China (Grant Nos 11874350, 11434010 and 11474277).

Presenters

  • Miao-Ling Lin

    • Chinese Academy of Sciences
    • State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors,Chinese Academy of Sciences, Beijing 100083, China

Authors

  • Miao-Ling Lin

    • Chinese Academy of Sciences
    • State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors,Chinese Academy of Sciences, Beijing 100083, China

  • Yu Zhou

    • Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 30

  • Hai Li

    • Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 30

  • Wang Yao

    • University of Hong Kong
    • The University of Hong Kong
    • Department of Physics and Centre of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China

  • Ping-Heng Tan

    • Chinese Academy of Sciences
    • State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors,Chinese Academy of Sciences, Beijing 100083, China
    • State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences