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Orbital Chern Insulators in van der Waals Moiré Systems

Topological electronic phases manifest fascinating phenomena, including electronic transport via topologically-protected edge states, anomalous responses to external fields, and excitations with anyonic statistics. Harnessing thes... see more

30/06/2029

IST AUSTRIA

2M€

Project Budget: 2M€

Project leader

INSTITUTE OF SCIENCE AND TECHNOLOGY AUSTRIA No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

PARTICIPATION DEPralty Sin fecha límite de participación.

Financing granted El organismo HORIZON EUROPE notifico la concesión del proyecto The day 2023-10-31

ERC-2023-STG: ERC STARTING GRANTS Scope:Objectives

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Este proyecto no cuenta con búsquedas de partenariado abiertas en este momento.

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1 Participantes

IST AUSTRIA

1.83M€ | Leader

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Project duration: 67 months Date Start: 2023-10-31
End date: 2029-06-30

Project leader

INSTITUTE OF SCIENCE AND TECHNOLOGY AUSTRIA No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Project Budget 2M€

participation deadline Sin fecha límite de participación.

Project description Topological electronic phases manifest fascinating phenomena, including electronic transport via topologically-protected edge states, anomalous responses to external fields, and excitations with anyonic statistics. Harnessing these phenomena in electronic devices will lead to a technological breakthrough. The main obstacle to this has been the lack of topological systems that are simultaneously clean, versatile, robust, and highly tunable. We argue that the recent discovery of orbital Chern insulators (OCI) in graphene moiré heterostructures opens an exceptional opportunity to make a leap in our ability to manipulate topological electronic phases. Recently, moiré superlattices in van der Waals materials emerged as a powerful tool to realize correlated electronic phases. The exciting discovery of intrinsic quantum anomalous Hall effects in graphene moiré systems revealed interaction-driven orbital Chern insulating states at zero magnetic field. Unlike in most known magnets, the magnetism in OCIs arises predominantly from the orbital motion of the electrons rather than their spins, endowing them with unique properties. Remarkably, the moiré heterostructures hosting OCIs could also be gate-tuned to superconducting, correlated insulating, and metallic isospin-ferromagnetic states, which opens unprecedented opportunities for novel devices. These unique features of OCIs set them apart and warrant their thorough investigation. This proposal aims to establish the fundamental properties of OCIs, focusing on three key questions: (i) What are the phase diagram, isospin order, and thermodynamics of OCIs? (ii) What is the physics of the chiral edge states and domain walls in OCIs? (iii) Can strong interactions in flat moiré bands lead to fractional quantum anomalous Hall effect? To address these questions, we will apply a combination of complementary experimental techniques to probe electronic transport and thermodynamic properties in high-quality graphene moiré devices.

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