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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932177" target="_blank" >RIV/60461373:22310/25:43932177 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prx/pdf/10.1103/PhysRevX.15.011052" target="_blank" >https://journals.aps.org/prx/pdf/10.1103/PhysRevX.15.011052</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevX.15.011052" target="_blank" >10.1103/PhysRevX.15.011052</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review X

ISSN

2160-3308

e-ISSN

—

Svazek periodika

15

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

nestránkováno

Kód UT WoS článku

001442587200001

EID výsledku v databázi Scopus

2-s2.0-86000560933