Valley domain walls act as impenetrable barriers to transport in metallic rhombohedral graphene unless intervalley interactions mediate transmission, and intervalley mixing is required for appreciable supercurrent in SNS' junctions connecting opposite-chirality regions.
Family of Unconventional Superconductivities in Crystalline Graphene
4 Pith papers cite this work. Polarity classification is still indexing.
4
Pith papers citing it
abstract
Unconventional superconductors exhibit multiple broken symmetries and exceed the range of the Bardeen-Cooper-Schrieffer (BCS) theory. For instance, time-reversal symmetry can be broken in addition to the gauge symmetry, resulting in superconductors that can be enhanced or induced by a magnetic field. However, such unconventional superconductivities are more vulnerable to impurities than their BCS counterparts, requiring highly ordered and clean material systems to observe them. Crystalline rhombohedral multilayer graphene is a promising platform to explore unconventional superconductivity due to its superior material quality and gate-tunable strong correlation effects. Here we report transport measurements of rhombohedral tetralayer and pentalayer graphene, where a spectrum of superconductivities in a clean limit are observed. Three of them (SC2-4) show highly unusual enhancements by magnetic fields: 1. SC2 is strengthened by an in-plane field; 2. SC3 is boosted by a small out-of-plane field; 3. SC4 is induced by an in-plane field. All these superconductors are robust against an in-plane field up to 8.5 Tesla, exceeding the Pauli limit of conventional superconductors by tens of times and suggesting their unconventional nature. Moreover, we observed that proximitized spin-orbit coupling generates a plethora of new superconductors in the phase diagram, while maintaining the high quality of bare rhombohedral graphene. Our work establishes a family of new superconductors in rhombohedral multilayer graphene, which also provides an ideal platform to engineer non-Abelian quasiparticles by proximitizing with quantum anomalous Hall states existing in the same material system.
fields
cond-mat.mes-hall 4years
2026 4verdicts
UNVERDICTED 4representative citing papers
Nonuniform near-surface electrostatic potentials flatten surface bands in rhombohedral graphite at zero displacement field, enabling flat-band regimes in thick samples via self-consistent calculations.
Multiple superconducting phases observed in rhombohedral heptalayer graphene at low displacement fields, with one robust zero-resistance state arising from a half-metallic normal state.
Experimental discovery of a family of high-Chern-number orbital magnets in twisted (1+n) rhombohedral graphene with observed topological hierarchy C = n for n=3,4,5.
citing papers explorer
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Valley Valves at Domain Walls in Symmetry-Broken Rhombohedral Graphene
Valley domain walls act as impenetrable barriers to transport in metallic rhombohedral graphene unless intervalley interactions mediate transmission, and intervalley mixing is required for appreciable supercurrent in SNS' junctions connecting opposite-chirality regions.
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Electrostatically stabilized surface flat bands in rhombohedral graphite at zero displacement field
Nonuniform near-surface electrostatic potentials flatten surface bands in rhombohedral graphite at zero displacement field, enabling flat-band regimes in thick samples via self-consistent calculations.
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Multiple Superconducting Phases in Rhombohedral Heptalayer Graphene
Multiple superconducting phases observed in rhombohedral heptalayer graphene at low displacement fields, with one robust zero-resistance state arising from a half-metallic normal state.
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Family of High-Chern-Number Orbital Magnets in Twisted Rhombohedral Graphene
Experimental discovery of a family of high-Chern-number orbital magnets in twisted (1+n) rhombohedral graphene with observed topological hierarchy C = n for n=3,4,5.