Optical signatures of interlayer electron coherence in a bilayer semiconductor
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866918136510414848 |
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| author | Liu, Xiaoling Leisgang, Nadine Dolgirev, Pavel E. Zibrov, Alexander A. Sung, Jiho Wang, Jue Taniguchi, Takashi Watanabe, Kenji Walther, Valentin Park, Hongkun Demler, Eugene Kim, Philip Lukin, Mikhail D. |
| author_facet | Liu, Xiaoling Leisgang, Nadine Dolgirev, Pavel E. Zibrov, Alexander A. Sung, Jiho Wang, Jue Taniguchi, Takashi Watanabe, Kenji Walther, Valentin Park, Hongkun Demler, Eugene Kim, Philip Lukin, Mikhail D. |
| contents | Emergent strongly-correlated electronic phenomena in atomically-thin transition metal dichalcogenides are an exciting frontier in condensed matter physics, with examples ranging from bilayer superconductivity~\cite{zhao2023evidence} and electronic Wigner crystals~\cite{smolenski2021signatures,zhou2021bilayer} to the ongoing quest for exciton condensation~\cite{wang2019evidence,ma2021strongly,shi2022bilayer}. Here, we experimentally investigate the properties of indirect excitons in naturally-grown MoS$_2$-homobilayer, integrated in a dual-gate device structure allowing independent control of the electron density and out-of-plane electric field. Under conditions when electron tunneling between the layers is negligible~\cite{pisoni2019absence}, upon electron doping the sample, we observe that the two excitons with opposing dipoles hybridize, displaying unusual behavior distinct from both conventional level crossing and anti-crossing. We show that these observations can be explained by static random coupling between the excitons, which increases with electron density and decreases with temperature. We argue that this phenomenon is indicative of a spatially fluctuating order parameter in the form of interlayer electron coherence, a theoretically predicted many-body state~\cite{zheng1997exchange} that has yet to be unambiguously established experimentally outside of the quantum Hall regime~\cite{sarma2008perspectives,spielman2000resonantly,kellogg2004vanishing,kellogg2002observation,spielman2001observation,fertig1989energy,shi2022bilayer}. Implications of our findings for future experiments and quantum optics applications are discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_08329 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Optical signatures of interlayer electron coherence in a bilayer semiconductor Liu, Xiaoling Leisgang, Nadine Dolgirev, Pavel E. Zibrov, Alexander A. Sung, Jiho Wang, Jue Taniguchi, Takashi Watanabe, Kenji Walther, Valentin Park, Hongkun Demler, Eugene Kim, Philip Lukin, Mikhail D. Strongly Correlated Electrons Emergent strongly-correlated electronic phenomena in atomically-thin transition metal dichalcogenides are an exciting frontier in condensed matter physics, with examples ranging from bilayer superconductivity~\cite{zhao2023evidence} and electronic Wigner crystals~\cite{smolenski2021signatures,zhou2021bilayer} to the ongoing quest for exciton condensation~\cite{wang2019evidence,ma2021strongly,shi2022bilayer}. Here, we experimentally investigate the properties of indirect excitons in naturally-grown MoS$_2$-homobilayer, integrated in a dual-gate device structure allowing independent control of the electron density and out-of-plane electric field. Under conditions when electron tunneling between the layers is negligible~\cite{pisoni2019absence}, upon electron doping the sample, we observe that the two excitons with opposing dipoles hybridize, displaying unusual behavior distinct from both conventional level crossing and anti-crossing. We show that these observations can be explained by static random coupling between the excitons, which increases with electron density and decreases with temperature. We argue that this phenomenon is indicative of a spatially fluctuating order parameter in the form of interlayer electron coherence, a theoretically predicted many-body state~\cite{zheng1997exchange} that has yet to be unambiguously established experimentally outside of the quantum Hall regime~\cite{sarma2008perspectives,spielman2000resonantly,kellogg2004vanishing,kellogg2002observation,spielman2001observation,fertig1989energy,shi2022bilayer}. Implications of our findings for future experiments and quantum optics applications are discussed. |
| title | Optical signatures of interlayer electron coherence in a bilayer semiconductor |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.08329 |