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arXiv · 2304.14037

Field-induced hybridization of moir\'e excitons in MoSe$_2$/WS$_2$ heterobilayers

Borislav Polovnikov·Johannes Scherzer·Subhradeep Misra·Xin Huang·Christian Mohl·Zhijie Li·Jonas Göser·Jonathan Förste·Ismail Bilgin·Kenji Watanabe·Takashi Taniguchi·Alexander Högele·Anvar S. Baimuratov
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Abstract

We study experimentally and theoretically the hybridization among intralayer and interlayer moir\'e excitons in a MoSe$_2$/WS$_2$ heterostructure with antiparallel alignment. Using a dual-gate device and cryogenic white light reflectance and narrow-band laser modulation spectroscopy, we subject the moir\'e excitons in the MoSe$_2$/WS$_2$ heterostack to a perpendicular electric field, monitor the field-induced dispersion and hybridization of intralayer and interlayer moir\'e exciton states, and induce a cross-over from type I to type II band alignment. Moreover, we employ perpendicular magnetic fields to map out the dependence of the corresponding exciton Land\'e $g$-factors on the electric field. Finally, we develop an effective theoretical model combining resonant and non-resonant contributions to moir\'e potentials to explain the observed phenomenology, and highlight the relevance of interlayer coupling for structures with close energetic band alignment as in MoSe$_2$/WS$_2$.

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Borislav Polovnikov, Johannes Scherzer, Subhradeep Misra, Xin Huang, Christian Mohl, Zhijie Li, Jonas Göser, Jonathan Förste, Ismail Bilgin, Kenji Watanabe, Takashi Taniguchi, Alexander Högele, Anvar S. Baimuratov. 2023-04-27. Field-induced hybridization of moir\'e excitons in MoSe$_2$/WS$_2$ heterobilayers. https://doi.org/10.1103/physrevlett.132.076902

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