Chiral response of twisted bilayer graphene
Entidad
UAM. Departamento de Física de la Materia Condensada; Centro de Biología Molecular Severo Ochoa (CBM)Editor
American Physical SocietyFecha de edición
2018-01-25Cita
10.1103/PhysRevLett.120.046801
Physical Review Letters 120.4 (2018): 046801
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.120.046801Financiado por
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-1741660Proyecto
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-CMVersión del editor
https://doi.org/10.1103/PhysRevLett.120.046801Materias
Chiral; Electromagnetic; Response; Twisted; Optical activity; FísicaDerechos
© 2018 American Physical SocietyResumen
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
Lista de ficheros
Google Scholar:Stauber, Tobias
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Low, T.
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Gómez Santos, Guillermo
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