Orbitally tuned composite-fermion metal-to-superfluid transitions
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908731681275904 |
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| author | Kumar, Ravi Firon, Tomer Haug, André Yutushui, Misha Gaon, Alon Ner Watanabe, Kenji Taniguchi, Takashi Mross, David F. Ronen, Yuval |
| author_facet | Kumar, Ravi Firon, Tomer Haug, André Yutushui, Misha Gaon, Alon Ner Watanabe, Kenji Taniguchi, Takashi Mross, David F. Ronen, Yuval |
| contents | The effective interaction between composite fermions, set entirely by the Coulomb potential and the underlying electronic Landau level orbitals, can stabilize exotic fractional quantum Hall states. In particular, half-filled Landau levels with different orbital character can host either metallic or paired phases of composite fermions. Here, we leverage experimental control over the orbital composition to realize a composite-fermion pairing transition in the first excited Landau level of bilayer graphene. Transport measurements at filling factors v = 9/2 and 11/2 reveal conductive states giving way to well-developed plateaus with increasing displacement fields. These states are insensitive to an in-plane magnetic field, indicating single-component ground states and thus pointing at non-Abelian orders. Our numerical study, based on displacement-field-dependent Landau-level wavefunctions, supports the orbital origin of the pairing transition and suggests Moore-Read or anti-Pfaffian ground states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21383 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Orbitally tuned composite-fermion metal-to-superfluid transitions Kumar, Ravi Firon, Tomer Haug, André Yutushui, Misha Gaon, Alon Ner Watanabe, Kenji Taniguchi, Takashi Mross, David F. Ronen, Yuval Mesoscale and Nanoscale Physics Strongly Correlated Electrons The effective interaction between composite fermions, set entirely by the Coulomb potential and the underlying electronic Landau level orbitals, can stabilize exotic fractional quantum Hall states. In particular, half-filled Landau levels with different orbital character can host either metallic or paired phases of composite fermions. Here, we leverage experimental control over the orbital composition to realize a composite-fermion pairing transition in the first excited Landau level of bilayer graphene. Transport measurements at filling factors v = 9/2 and 11/2 reveal conductive states giving way to well-developed plateaus with increasing displacement fields. These states are insensitive to an in-plane magnetic field, indicating single-component ground states and thus pointing at non-Abelian orders. Our numerical study, based on displacement-field-dependent Landau-level wavefunctions, supports the orbital origin of the pairing transition and suggests Moore-Read or anti-Pfaffian ground states. |
| title | Orbitally tuned composite-fermion metal-to-superfluid transitions |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.21383 |