Electric-Field Switchable Chirality in Rhombohedral Graphene Chern Insulators Stabilized by Tungsten Diselenide DOI Creative Commons

Jing Ding,

Hanxiao Xiang,

Jiannan Hua

et al.

Physical Review X, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 10, 2025

Chern insulators host topologically protected chiral edge currents with quantized conductance characterized by their number. Switching the chirality of a insulator, namely, direction current, is highly challenging due to forbidden backscattering but considerable importance for design topological devices. Nevertheless, this can be achieved reversing sign Here, we report electrically switchable in rhombohedral multilayer graphene-based through phase transition. By introducing moiré superlattices heptalayer graphene, observe cascade transitions at quarter electron filling band number tunable from −1, 1, 2. Furthermore, integrating monolayer tungsten diselenide moiréless interface decalayer graphene and hexagonal boron nitride stabilizes insulators, enabling anomalous Hall resistance h/2e2. Remarkably, switched using displacement fields, leading transition −1 Our work establishes as versatile platform engineering, offering significant promise into electronic circuits. Published American Physical Society 2025

Language: Английский

Single-particle spectral function of fractional quantum anomalous Hall states DOI
Fabian Pichler, Wilhelm Kadow, Clemens Kuhlenkamp

et al.

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(7)

Published: Feb. 4, 2025

Fractional quantum Hall states are the most prominent example of with topological order, hosting excitations fractionalized charge. Recent experiments in twisted MoTe2 and graphene-based heterostructures provided evidence fractional anomalous (FQAH) states, which spontaneously break time-reversal symmetry persist even without an external magnetic field. Understanding unique properties these requires characterization their low-energy excitations. To that end, we construct a parton theory for energy- momentum-resolved single-particle spectral function FQAH states. We explicitly consider several experimentally observed filling fractions as well composite Fermi liquid half-filled Chern band. Charge fractionalization manifests itself nearly momentum-independent spectra characteristic series peaks determined from fraction. The description qualitatively captures our numerical exact diagonalization results. Additionally, discuss how finite bandwidth band nonideal geometry affect Our work demonstrates electronic provides valuable tool to characterize moiré lattices. Published by American Physical Society 2025

Language: Английский

Citations

0
Superconductivity in twisted transition metal dichalcogenide homobilayers DOI
Jihang Zhu, Yang-Zhi Chou, Ming Xie

et al.

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(6)

Published: Feb. 6, 2025

Language: Английский

Citations

0
Correlated states controlled by a tunable van Hove singularity in moiré WSe2 bilayers DOI Creative Commons
Patrick Knüppel, Jiacheng Zhu,

Yiyu Xia

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 25, 2025

Abstract Twisted transition metal dichalcogenide (TMD) bilayers have enabled the discovery of superconductivity, ferromagnetism, correlated insulators, and a series new topological phases matter. However, connection between these electronic matter underlying band structure singularities has remained largely unexplored. Here, combining magnetic circular dichroism exciton sensing measurements, we investigate influence van Hove singularity (vHS) on in bilayer WSe 2 with twist angle 3 degrees. By tuning vHS across Fermi level using electric fields, observe Stoner ferromagnetism below moiré lattice filling one Chern insulators at one. The experimental observations are supported by continuum model calculations. Our results highlight prospect engineering materials tunable singularities.

Language: Английский

Citations

0
Superconductivity and quantized anomalous Hall effect in rhombohedral graphene DOI
Youngjoon Choi, Ysun Choi, Marco Valentini

et al.

Nature, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

Language: Английский

Citations

0
Electric-Field Switchable Chirality in Rhombohedral Graphene Chern Insulators Stabilized by Tungsten Diselenide DOI Creative Commons

Jing Ding,

Hanxiao Xiang,

Jiannan Hua

et al.

Physical Review X, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 10, 2025

Chern insulators host topologically protected chiral edge currents with quantized conductance characterized by their number. Switching the chirality of a insulator, namely, direction current, is highly challenging due to forbidden backscattering but considerable importance for design topological devices. Nevertheless, this can be achieved reversing sign Here, we report electrically switchable in rhombohedral multilayer graphene-based through phase transition. By introducing moiré superlattices heptalayer graphene, observe cascade transitions at quarter electron filling band number tunable from −1, 1, 2. Furthermore, integrating monolayer tungsten diselenide moiréless interface decalayer graphene and hexagonal boron nitride stabilizes insulators, enabling anomalous Hall resistance h/2e2. Remarkably, switched using displacement fields, leading transition −1 Our work establishes as versatile platform engineering, offering significant promise into electronic circuits. Published American Physical Society 2025

Language: Английский

Citations

0