Coherent Bunching of Anyons and their Dissociation in Interference Experiments
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arXiv
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| Natura: | Preprint |
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2024
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| author | Ghosh, Bikash Labendik, Maria Umansky, Vladimir Heiblum, Moty Mross, David F. |
| author_facet | Ghosh, Bikash Labendik, Maria Umansky, Vladimir Heiblum, Moty Mross, David F. |
| contents | Aharonov-Bohm (AB) interference of fractional quasiparticles in the quantum Hall Effect generally reveals their elementary charge ($e^*$)[1-15]. Recently, our interferometry experiments with several particle states reported flux periods of $ΔΦ=(e/e^*)Φ_0$ the flux quantum) at moderate temperatures[16]. Here, we report interference measurements of particle-hole conjugated states at filling factor $ν=2/3, 3/5, 4/7$, revealing unexpected flux periodicities of $ΔΦ=Φ_0/ν$. The measured shot noise Fano factor (F) of the partitioned quasiparticles in each of the interferometers quantum point contacts (QPCs), was found to be, $F=ν$[17], and not that of the elementary charge, $F=e^*/e$[18,19]. These observations point to interference of bunched (clustered) elementary quasiparticles as coherent pairs, triples, and quadruplets, respectively. A small metallic gate (top gate, TG), deposited in the center of the interferometer bulk, forming an antidot (or a dot) when charged, thus introducing local quasiparticles at the (anti)dots perimeter. Surprisingly, such charging led to a dissociation of the bunched quasiparticles and thus recovered the conventional flux periodicity set by the elementary quasiparticles charge. However, the shot noise Fano factor (of each QPC) consistently remained at $F=ν$, possibly due to the neutral modes accompanied the conjugated states. The two observations - bunching and debunching (or dissociation) - are not expected by current theories. Similar effects may likely arise in Jains particle states (at lower temperatures) and at even denominator FQH states[20] |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16316 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coherent Bunching of Anyons and their Dissociation in Interference Experiments Ghosh, Bikash Labendik, Maria Umansky, Vladimir Heiblum, Moty Mross, David F. Mesoscale and Nanoscale Physics Aharonov-Bohm (AB) interference of fractional quasiparticles in the quantum Hall Effect generally reveals their elementary charge ($e^*$)[1-15]. Recently, our interferometry experiments with several particle states reported flux periods of $ΔΦ=(e/e^*)Φ_0$ the flux quantum) at moderate temperatures[16]. Here, we report interference measurements of particle-hole conjugated states at filling factor $ν=2/3, 3/5, 4/7$, revealing unexpected flux periodicities of $ΔΦ=Φ_0/ν$. The measured shot noise Fano factor (F) of the partitioned quasiparticles in each of the interferometers quantum point contacts (QPCs), was found to be, $F=ν$[17], and not that of the elementary charge, $F=e^*/e$[18,19]. These observations point to interference of bunched (clustered) elementary quasiparticles as coherent pairs, triples, and quadruplets, respectively. A small metallic gate (top gate, TG), deposited in the center of the interferometer bulk, forming an antidot (or a dot) when charged, thus introducing local quasiparticles at the (anti)dots perimeter. Surprisingly, such charging led to a dissociation of the bunched quasiparticles and thus recovered the conventional flux periodicity set by the elementary quasiparticles charge. However, the shot noise Fano factor (of each QPC) consistently remained at $F=ν$, possibly due to the neutral modes accompanied the conjugated states. The two observations - bunching and debunching (or dissociation) - are not expected by current theories. Similar effects may likely arise in Jains particle states (at lower temperatures) and at even denominator FQH states[20] |
| title | Coherent Bunching of Anyons and their Dissociation in Interference Experiments |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.16316 |