Chiral response of twisted bilayer graphene
Entity
UAM. Departamento de Física de la Materia Condensada; Centro de Biología Molecular Severo Ochoa (CBM)Publisher
American Physical SocietyDate
2018-01-25Citation
10.1103/PhysRevLett.120.046801
Physical Review Letters 120.4 (2018): 046801
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.120.046801Funded by
This work has been supported by Spain’s MINECO under Grants No. MDM-2014-0377, No. FIS2017-82260-P, No. FIS2015-64886-C5-5-P, and No. FIS2014-57432-P, and by the Comunidad de Madrid under Grant No. S2013/MIT-3007 MAD2D-CM. T. L. acknowledges support by the National Science Foundation, NSF/EFRI Grant No. EFRI-1741660Project
Gobierno de España. MDM-2014-0377; Gobierno de España. FIS2017-82260-P; Gobierno de España. FIS2015-64886-C5-5-P; Gobierno de España. FIS2014-57432-P; Comunidad de Madrid. S2013/ MIT-3007/MAD2D-CMEditor's Version
https://doi.org/10.1103/PhysRevLett.120.046801Subjects
Chiral; Electromagnetic; Response; Twisted; Optical activity; FísicaRights
© 2018 American Physical SocietyAbstract
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
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Google Scholar:Stauber, Tobias
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Low, T.
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Gómez Santos, Guillermo
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