Kheirabadi, Narjes and McCann, Edward and Falko, Vladimir (2018) Cyclotron resonance of the magnetic ratchet effect and second harmonic generation in bilayer graphene. Physical review B, 97 (7): 075415. ISSN 1098-0121
cyclotron_resonance_published_version.pdf - Published Version
Available under License None.
Download (435kB)
cyclotron_resonance_author_accepted.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.
Download (441kB)
Abstract
We model the magnetic ratchet effect in bilayer graphene in which a dc electric current is produced by an ac electric field of frequency ω in the presence of a steady in-plane magnetic field and inversion-symmetry breaking. In bilayer graphene, the ratchet effect is tunable by an external metallic gate which breaks inversion symmetry. For zero in-plane magnetic field, we show that trigonal warping and inversion-symmetry breaking are able to produce a large dc valley current, but not a non-zero total dc charge current. For the magnetic ratchet in a tilted magnetic field, the perpendicular field component induces cyclotron motion with frequency ωc and we find that the dc current displays cyclotron resonance at ωc = ω, although this peak in the current is actually smaller than its value at ωc = 0. Second harmonic generation, however, is greatly enhanced by resonances at ωc = ω and ωc = 2ω for which the current is generally much larger than at ωc = 0.