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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.08468 |
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| _version_ | 1866914315569725440 |
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| author | Alkalai, Tomer Hajigeorgiou, Emily Gupta, Adbhut Senapati, Tapas Tiwari, Priya Tai, Chia-Tse Singh, Siddharth Kumar Baldwin, Kirk W. Pfeiffer, Loren N. Shayegan, Mansour Banerjee, Mitali Heiblum, Moty |
| author_facet | Alkalai, Tomer Hajigeorgiou, Emily Gupta, Adbhut Senapati, Tapas Tiwari, Priya Tai, Chia-Tse Singh, Siddharth Kumar Baldwin, Kirk W. Pfeiffer, Loren N. Shayegan, Mansour Banerjee, Mitali Heiblum, Moty |
| contents | Even-denominator fractional quantum Hall states (FQHSs) fall outside the standard Laughlin's and Jain's odd-denominator hierarchy. In this work, we study the FQHS $ν=1/2$ in the lowest Landau level. The state is confined within a 70 nm-wide GaAs quantum well, where the electrons exhibit a bilayer-like charge distribution. Inter-layer interactions stabilize the $ν=1/2$ FQHS, which is predicted to host quasiparticles with charge e/4 - with either Abelian or non-Abelian topological order. Here, we report on shot-noise measurements of partitioned quasiparticles at $ν=1/2$, where charge partitioning is generated by a unique etch-defined quantum point contact. Our measurements were performed on two nominally identical devices, at two independent experimental setups. Analysis of shot noise in the weak-backscattering regime in each device reveals quasiparticles with charge e/4. These observations provide a clear benchmark for future studies aimed at probing the topological order of the $ν=1/2$ FQHS and its quasiparticles' exchange statistics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08468 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of e/4 charge at $ν=1/2$ in GaAs Alkalai, Tomer Hajigeorgiou, Emily Gupta, Adbhut Senapati, Tapas Tiwari, Priya Tai, Chia-Tse Singh, Siddharth Kumar Baldwin, Kirk W. Pfeiffer, Loren N. Shayegan, Mansour Banerjee, Mitali Heiblum, Moty Mesoscale and Nanoscale Physics Even-denominator fractional quantum Hall states (FQHSs) fall outside the standard Laughlin's and Jain's odd-denominator hierarchy. In this work, we study the FQHS $ν=1/2$ in the lowest Landau level. The state is confined within a 70 nm-wide GaAs quantum well, where the electrons exhibit a bilayer-like charge distribution. Inter-layer interactions stabilize the $ν=1/2$ FQHS, which is predicted to host quasiparticles with charge e/4 - with either Abelian or non-Abelian topological order. Here, we report on shot-noise measurements of partitioned quasiparticles at $ν=1/2$, where charge partitioning is generated by a unique etch-defined quantum point contact. Our measurements were performed on two nominally identical devices, at two independent experimental setups. Analysis of shot noise in the weak-backscattering regime in each device reveals quasiparticles with charge e/4. These observations provide a clear benchmark for future studies aimed at probing the topological order of the $ν=1/2$ FQHS and its quasiparticles' exchange statistics. |
| title | Observation of e/4 charge at $ν=1/2$ in GaAs |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.08468 |