Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Gao, Beini Suárez-Forero, Daniel G. Sarkar, Supratik Huang, Tsung-Sheng Session, Deric Mehrabad, Mahmoud Jalali Ni, Ruihao Xie, Ming Upadhyay, Pranshoo Vannucci, Jonathan Mittal, Sunil Watanabe, Kenji Taniguchi, Takashi Imamoglu, Atac Zhou, You Hafezi, Mohammad |
| author_facet | Gao, Beini Suárez-Forero, Daniel G. Sarkar, Supratik Huang, Tsung-Sheng Session, Deric Mehrabad, Mahmoud Jalali Ni, Ruihao Xie, Ming Upadhyay, Pranshoo Vannucci, Jonathan Mittal, Sunil Watanabe, Kenji Taniguchi, Takashi Imamoglu, Atac Zhou, You Hafezi, Mohammad |
| contents | Understanding the Hubbard model is crucial for investigating various quantum many-body states and its fermionic and bosonic versions have been largely realized separately. Recently, transition metal dichalcogenides heterobilayers have emerged as a promising platform for simulating the rich physics of the Hubbard model. In this work, we explore the interplay between fermionic and bosonic populations, using a $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer device that hosts this hybrid particle density. We independently tune the fermionic and bosonic populations by electronic doping and optical injection of electron-hole pairs, respectively. This enables us to form strongly interacting excitons that are manifested in a large energy gap in the photoluminescence spectrum. The incompressibility of excitons is further corroborated by measuring exciton diffusion, which remains constant upon increasing pumping intensity, as opposed to the expected behavior of a weakly interacting gas of bosons, suggesting the formation of a bosonic Mott insulator. We explain our observations using a two-band model including phase space filling. Our system provides a controllable approach to the exploration of quantum many-body effects in the generalized Bose-Fermi-Hubbard model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2304_09731 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer Gao, Beini Suárez-Forero, Daniel G. Sarkar, Supratik Huang, Tsung-Sheng Session, Deric Mehrabad, Mahmoud Jalali Ni, Ruihao Xie, Ming Upadhyay, Pranshoo Vannucci, Jonathan Mittal, Sunil Watanabe, Kenji Taniguchi, Takashi Imamoglu, Atac Zhou, You Hafezi, Mohammad Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics Understanding the Hubbard model is crucial for investigating various quantum many-body states and its fermionic and bosonic versions have been largely realized separately. Recently, transition metal dichalcogenides heterobilayers have emerged as a promising platform for simulating the rich physics of the Hubbard model. In this work, we explore the interplay between fermionic and bosonic populations, using a $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer device that hosts this hybrid particle density. We independently tune the fermionic and bosonic populations by electronic doping and optical injection of electron-hole pairs, respectively. This enables us to form strongly interacting excitons that are manifested in a large energy gap in the photoluminescence spectrum. The incompressibility of excitons is further corroborated by measuring exciton diffusion, which remains constant upon increasing pumping intensity, as opposed to the expected behavior of a weakly interacting gas of bosons, suggesting the formation of a bosonic Mott insulator. We explain our observations using a two-band model including phase space filling. Our system provides a controllable approach to the exploration of quantum many-body effects in the generalized Bose-Fermi-Hubbard model. |
| title | Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2304.09731 |