Emergent phases in graphene flat bands

Bhowmik, S and Ghosh, A and Chandni, U (2024) Emergent phases in graphene flat bands. In: Reports on Progress in Physics, 87 (9).

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Abstract

Electronic correlations in two-dimensional materials play a crucial role in stabilising emergent phases of matter. The realisation of correlation-driven phenomena in graphene has remained a longstanding goal, primarily due to the absence of strong electron-electron interactions within its low-energy bands. In this context, magic-angle twisted bilayer graphene has recently emerged as a novel platform featuring correlated phases favoured by the low-energy flat bands of the underlying moiré superlattice. Notably, the observation of correlated insulators and superconductivity, and the interplay between these phases have garnered significant attention. A wealth of correlated phases with unprecedented tunability was discovered subsequently, including orbital ferromagnetism, Chern insulators, strange metallicity, density waves, and nematicity. However, a comprehensive understanding of these closely competing phases remains elusive. The ability to controllably twist and stack multiple graphene layers has enabled the creation of a whole new family of moiré superlattices with myriad properties. Here, we review the progress and development achieved so far, encompassing the rich phase diagrams offered by these graphene-based moiré systems. Additionally, we discuss multiple phases recently observed in non-moiré multilayer graphene systems. Finally, we outline future opportunities and challenges for the exploration of hidden phases in this new generation of moiré materials. © 2024 IOP Publishing Ltd

Item Type:	Journal Article
Publication:	Reports on Progress in Physics
Publisher:	Institute of Physics
Additional Information:	The copyright for this article belongs to the publisher.
Keywords:	graphene, article; bilayer membrane; controlled study; electron; superconductivity
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 Aug 2024 09:15
Last Modified:	30 Aug 2024 09:15
URI:	http://eprints.iisc.ac.in/id/eprint/85964

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