Signatures of unconventional superconductivity near reentrant and fractional quantum anomalous Hall insulators

2025/04/09 by Fan Xu, Zheng Sun, Xu, Fan +35 · 33 citations
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Superconductivity (cond-mat.supr-con) #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.2504.06972

openalex publication_date 2025/04/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

Two-dimensional moiré Chern bands provide an exceptional platform for exploring a variety of many-body quantum phases at zero magnetic field within a lattice system. One particular intriguing possibility is that flat Chern bands can, in principle, support exotic superconducting phases together with fractional topological phases. Here, we report the observation of integer and fractional quantum anomalous Hall effects, the reentrant quantum anomalous Hall effect, and superconductivity within the first moiré Chern band of twisted bilayer MoTe2. The superconducting phase emerges from a normal state exhibiting anomalous Hall effects. Our results present the first example of superconductivity emerging within a flat Chern band that simultaneously hosts fractional quantum anomalous effects, a phenomenon never observed in any other systems. Our work expands the understanding of emergent quantum phenomena in moiré Chern bands, and offers a nearly ideal platform for engineering Majorana and parafermion zero modes in gate-controlled hybrid devices.

Cited by

• Fractional quantum anomalous Hall and anyon density-wave halo in a minimal interacting lattice model of twisted bilayer MoTe₂
• Topological Charge-2ne Superconductors
• Non-Abelian topological superconductivity from melting Abelian fractional Chern insulators
• Moiré-modulated Γ valley in twisted bilayer and twisted double-bilayer MoTe₂
• A Numerical Perspective on Moiré Superlattices: From Single-Particle Properties to Many-Body Physics
• Refining Heuristic Predictors of Fractional Chern Insulators using Machine Learning
• Correlations between superconducting and resistive anisotropies
• Average density of Bloch electrons in a homogeneous magnetic field: a second-order response
• Upper critical in-plane magnetic field in quasi-2D layered superconductors
• Phases of Quasi-One-Dimensional Fractional Quantum (Anomalous) Hall - Superconductor Heterostructures
• Charge-6e superconductivity from doping SU(3) spin liquids
• Quantum geometry and impurity sensitivity of superconductors without time-reversal symmetry: application to rhombohedral graphene and altermagnets
• Vestigial pairing from fluctuating magnetism and triplet superconductivity
• Chern-Selective multi-valley Flat Bands in Twisted Mono-Bilayer and Mono-Trilayer MoTe₂
• Superconductivity Proximate to Non-Abelian Fractional Spin Hall Insulator in Twisted Bilayer MoTe₂
• Pathways from a chiral superconductor to a composite Fermi liquid
• Competing Chern states revealed by quasiparticle charging in moiré rhombohedral graphene
• Extended s-wave superconductivity in M-point twisted bilayer SnSe2
• Localized Excitons and Landau-Level Mixing in Time-Reversal Symmetric Pairs of Chern Bands
• Fractional topological insulators at odd-integer filling: Phase diagram of two-valley quantum Hall model
• Visualizing Electronic Structure of Twisted Bilayer MoTe2 in Devices
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Symmetry-enforced Moiré Topology
• Wilson-Loop-Ideal Bands and General Idealization
• Robust superconductivity upon doping chiral spin liquid and Chern insulators in a Hubbard-Hofstadter model
• Quantum melting a Wigner crystal into Hall liquids
• Optical Switching of Moiré Chern Ferromagnet
• Optical Control of Integer and Fractional Chern Insulators
• Thermodynamics of dilute anyon gases from fusion constraints
• Role of electron-electron interactions in M-valley twisted transition metal dichalcogenides
• Charge-4e Anyon Superconductor from Doping SU(4)₁ chiral spin liquid
• Composite Fermion Theory of Fractional Chern Insulator Stability
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides

Related

• Ferromagnetism and Topology of the Higher Flat Band in a Fractional Chern Insulator
• Robust non-Abelian even-denominator fractional Chern insulator in twisted bilayer MoTe₂
• Evidence of competing ground states between fractional Chern insulator and antiferromagnetism in moiré MoTe2
• From fractional Chern insulators to topological electronic crystals in moiré MoTe2: quantum geometry tuning via remote layer
• Superconductivity Proximate to Non-Abelian Fractional Spin Hall Insulator in Twisted Bilayer MoTe₂