Anomalously Enhanced Diffusivity of Moiré Excitons via Manipulating the Interplay with Correlated Electrons
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917804025839616 |
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| author | Yan, Li Ma, Lei Meng, Yuze Xiao, Chengxin Chen, Bo Wu, Qiran Cui, Jingyuan Cao, Qingrui Banerjee, Rounak Taniguchi, Takashi Watanabe, Kenji Tongay, Seth Ariel Hunt, Benjamin Cui, Yong-Tao Yao, Wang Shi, Su-Fei |
| author_facet | Yan, Li Ma, Lei Meng, Yuze Xiao, Chengxin Chen, Bo Wu, Qiran Cui, Jingyuan Cao, Qingrui Banerjee, Rounak Taniguchi, Takashi Watanabe, Kenji Tongay, Seth Ariel Hunt, Benjamin Cui, Yong-Tao Yao, Wang Shi, Su-Fei |
| contents | Semiconducting transitional metal dichalcogenides (TMDCs) moiré superlattice provides an exciting platform for manipulating excitons. The in-situ control of moiré potential confined exciton would usher in unprecedented functions of excitonic devices but remains challenging. Meanwhile, as a dipolar composite boson, interlayer exciton in the type-II aligned TMDC moiré superlattice strongly interacts with fermionic charge carriers. Here, we demonstrate active manipulation of the exciton diffusivity by tuning their interplay with correlated carriers in moiré potentials. At fractional fillings where carriers are known to form generalized Wigner crystals, we observed suppressed diffusivity of exciton. In contrast, in Fermi liquid states where carriers dynamically populate all moiré traps, the repulsive carrier-exciton interaction can effectively reduce the moiré potential confinement seen by the exciton, leading to enhanced diffusivity with the increase of the carrier density. Notably, the exciton diffusivity is enhanced by orders of magnitude near the Mott insulator state, and the enhancement is much more pronounced for the 0-degree than the 60-degree aligned WS2/WSe2 heterobilayer due to the more localized nature of interlayer excitons. Our study inspires further engineering and controlling exotic excitonic states in TMDC moiré superlattices for fascinating quantum phenomena and novel excitonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11734 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anomalously Enhanced Diffusivity of Moiré Excitons via Manipulating the Interplay with Correlated Electrons Yan, Li Ma, Lei Meng, Yuze Xiao, Chengxin Chen, Bo Wu, Qiran Cui, Jingyuan Cao, Qingrui Banerjee, Rounak Taniguchi, Takashi Watanabe, Kenji Tongay, Seth Ariel Hunt, Benjamin Cui, Yong-Tao Yao, Wang Shi, Su-Fei Mesoscale and Nanoscale Physics Semiconducting transitional metal dichalcogenides (TMDCs) moiré superlattice provides an exciting platform for manipulating excitons. The in-situ control of moiré potential confined exciton would usher in unprecedented functions of excitonic devices but remains challenging. Meanwhile, as a dipolar composite boson, interlayer exciton in the type-II aligned TMDC moiré superlattice strongly interacts with fermionic charge carriers. Here, we demonstrate active manipulation of the exciton diffusivity by tuning their interplay with correlated carriers in moiré potentials. At fractional fillings where carriers are known to form generalized Wigner crystals, we observed suppressed diffusivity of exciton. In contrast, in Fermi liquid states where carriers dynamically populate all moiré traps, the repulsive carrier-exciton interaction can effectively reduce the moiré potential confinement seen by the exciton, leading to enhanced diffusivity with the increase of the carrier density. Notably, the exciton diffusivity is enhanced by orders of magnitude near the Mott insulator state, and the enhancement is much more pronounced for the 0-degree than the 60-degree aligned WS2/WSe2 heterobilayer due to the more localized nature of interlayer excitons. Our study inspires further engineering and controlling exotic excitonic states in TMDC moiré superlattices for fascinating quantum phenomena and novel excitonic devices. |
| title | Anomalously Enhanced Diffusivity of Moiré Excitons via Manipulating the Interplay with Correlated Electrons |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.11734 |