Cyclotron resonance of the magnetic ratchet effect and second harmonic generation in bilayer graphene

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). ISSN 1098-0121

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
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©2018 American Physical Society
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Deposited On:
20 Feb 2018 17:50
Last Modified:
18 Sep 2023 01:19