High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866912746939875328 |
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| author | Hu, Yuwen Tsui, Yen-Chen He, Minhao Kamber, Umut Wang, Taige Mohammadi, Amir S. Watanabe, Kenji Taniguchi, Takashi Papic, Zlatko Zaletel, Michael P. Yazdani, Ali |
| author_facet | Hu, Yuwen Tsui, Yen-Chen He, Minhao Kamber, Umut Wang, Taige Mohammadi, Amir S. Watanabe, Kenji Taniguchi, Takashi Papic, Zlatko Zaletel, Michael P. Yazdani, Ali |
| contents | Strong interaction between electrons in two-dimensional systems in the presence of a high magnetic field gives rise to fractional quantum Hall states that host quasiparticles with fractional charge and fractional exchange statistics. Here, we demonstrate high-resolution scanning tunneling microscopy and spectroscopy of fractional quantum Hall states in ultra clean Bernal-stacked bilayer graphene devices. Spectroscopy measurements show sharp excitations that have been predicted to emerge when electrons fractionalize into bound states of quasiparticles. We find energy gaps for candidate non-abelian fractional states that are larger by a factor of five than other related systems - for example semiconductor heterostructures - and this suggests bilayer graphene is an ideal platform for the manipulation of these quasiparticles and for the creation of a topological quantum bit. We also find previously unobserved fractional states in our very clean graphene samples. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_05789 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States Hu, Yuwen Tsui, Yen-Chen He, Minhao Kamber, Umut Wang, Taige Mohammadi, Amir S. Watanabe, Kenji Taniguchi, Takashi Papic, Zlatko Zaletel, Michael P. Yazdani, Ali Mesoscale and Nanoscale Physics Strongly Correlated Electrons Strong interaction between electrons in two-dimensional systems in the presence of a high magnetic field gives rise to fractional quantum Hall states that host quasiparticles with fractional charge and fractional exchange statistics. Here, we demonstrate high-resolution scanning tunneling microscopy and spectroscopy of fractional quantum Hall states in ultra clean Bernal-stacked bilayer graphene devices. Spectroscopy measurements show sharp excitations that have been predicted to emerge when electrons fractionalize into bound states of quasiparticles. We find energy gaps for candidate non-abelian fractional states that are larger by a factor of five than other related systems - for example semiconductor heterostructures - and this suggests bilayer graphene is an ideal platform for the manipulation of these quasiparticles and for the creation of a topological quantum bit. We also find previously unobserved fractional states in our very clean graphene samples. |
| title | High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2308.05789 |