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Local spin and valley isospin fluctuations and ordering in magic-angle twisted bilayer graphene

Published on:

15 September 2023

Primary Category:

Strongly Correlated Electrons

Paper Authors:

Gautam Rai,

Lorenzo Crippa,

Dumitru Călugăru,

Haoyu Hu,

Luca de' Medici,

Antoine Georges,

B. Andrei Bernevig,

Roser Valentí,

Giorgio Sangiovanni,

Tim Wehling

Bullets

Key Details

Local spin and valley isospin moments form around 100K in twisted bilayer graphene

These local moments order around 10K, enhancing gaps at integer fillings

Upon doping, charge is transferred between localized and delocalized states

This charge transfer causes Lifshitz transitions and periodic variations in compressibility

Distinct bad metal and good metal states exist above and below the ordering temperature

AI generated summary

Local spin and valley isospin fluctuations and ordering in magic-angle twisted bilayer graphene

This paper utilizes Dynamical Mean Field Theory to investigate electronic correlations and long-range order in magic-angle twisted bilayer graphene. It finds that local spin and valley isospin moments form around 100K and order around 10K. Upon doping, charge is transferred between localized and delocalized states, causing Lifshitz transitions and periodic variations in compressibility. The paper explains the nature of insulating, bad metal, and good metal states in twisted bilayer graphene.

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