Chiral Response of Twisted Bilayer Graphene

T. Stauber, T. Low, G. Gómez-Santos

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


We present an effective (minimal) theory for chiral two-dimensional materials. These materials possess an electromagnetic coupling without exhibiting a topological gap. As an example, we study the response of doped twisted bilayers, unveiling unusual phenomena in the zero frequency limit. An in-plane magnetic field induces a huge paramagnetic response at the neutrality point and, upon doping, also gives rise to a substantial longitudinal Hall response. The system also accommodates nontrivial longitudinal plasmonic modes that are associated with a longitudinal magnetic moment, thus endowing them with a chiral character. Finally, we note that the optical activity can be considerably enhanced upon doping and our general approach would enable systematic exploration of 2D material heterostructures with optical activity.

Original languageEnglish (US)
Article number046801
JournalPhysical review letters
Issue number4
StatePublished - Jan 25 2018
Externally publishedYes

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Publisher Copyright:
© 2018 American Physical Society.


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