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Twisted graphene layers exhibit tunable electronic properties

Published on:

10 November 2023

Primary Category:

Mesoscale and Nanoscale Physics

Paper Authors:

Priyanka Sinha,

Ayan Mondal,

Simão Meneses João,

Bheema Lingam Chittari

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Key Details

Twisted graphene layers show flat bands and localized states at small twist angles

Electric field lifts degeneracy at Dirac points, producing non-monotonic energy gaps

Landau levels are highly sensitive to twist angle

Hall conductivity transitions from half-integer to integer quantization near 2 degrees

Interlayer coupling crucial, electric field minimal impact near 'magic angle'

AI generated summary

Twisted graphene layers exhibit tunable electronic properties

This paper investigates how twisting two graphene layers impacts their electronic properties. It finds that at small twist angles below 3 degrees, the graphene layers exhibit flat bands and localized electronic states. Applying an electric field lifts the degeneracy at Dirac points and induces non-monotonic energy gaps. Landau levels are also highly sensitive to twist angle. The Hall conductivity undergoes a transition from half-integer to integer quantization around 2 degrees, acquiring a plateau at zero energy. Interlayer coupling is crucial, with electric field having minimal impact on transport properties near the 'magic angle'.

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