Every-other-layer Dipolar Excitons in a Spin-Valley locked Superlattice
- URL: http://arxiv.org/abs/2212.14140v1
- Date: Thu, 29 Dec 2022 00:51:20 GMT
- Title: Every-other-layer Dipolar Excitons in a Spin-Valley locked Superlattice
- Authors: Yinong Zhang, Chengxin Xiao, Dmitry Ovchinnikov, Jiayi Zhu, Xi Wang,
Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Wang Yao, Xiaodong Xu
- Abstract summary: Monolayer semiconducting transition metal dichalcogenides possess broken inversion symmetry and strong spin-orbit coupling.
Spin-valley locking yields an electronic superlattice structure, where alternating layers correspond to barrier and quantum well respectively.
We show that the spin-valley locked superlattice hosts a new kind of dipolar excitons with the electron and hole constituents separated in an every-other-layer configuration.
- Score: 4.6003462068971075
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Monolayer semiconducting transition metal dichalcogenides possess broken
inversion symmetry and strong spin-orbit coupling, which leads to unique
spin-valley locking effect. In 2H stacked pristine multilayers, the spin-valley
locking yields an electronic superlattice structure, where alternating layers
correspond to barrier and quantum well respectively, conditioned on the
spin-valley indices. Here, we show that the spin-valley locked superlattice
hosts a new kind of dipolar excitons with the electron and hole constituents
separated in an every-other-layer configuration, i.e., either in two even or
two odd layers. Such excitons become optically bright via hybridization with
intralayer excitons, displaying multiple anti-crossing patterns in optical
reflection spectrum as the dipolar exciton is tuned through the intralayer
resonance by electric field. The reflectance spectra also reveal an excited
state orbital of the every-other-layer exciton, pointing to a sizable binding
energy in the same order of magnitude as the intralayer exciton. As layer
thickness increases, the dipolar exciton can form one-dimensional Bose-Hubbard
chain displaying a layer number dependent fine-structures in the reflectance
spectra. Our work reveals a distinct valleytronic superlattice with highly
tunable dipolar excitons for exploring light-matter interactions.
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