Kammermeier, Michael and Wenk, Paul and Zulicke, Ulrich (2019) In-plane magnetoelectric response in bilayer graphene. PHYSICAL REVIEW B, 100 (7): 075421. ISSN 2469-9950, 2469-9969
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A graphene bilayer shows an unusual magnetoelectric response whose magnitude is controlled by the valley-isospin density, making it possible to link magnetoelectric behavior to valleytronics. Complementary to previous studies, we consider the effect of static homogeneous electric and magnetic fields that are oriented parallel to the bilayer's plane. Starting from a tight-binding description and using quasidegenerate perturbation theory, the low-energy Hamiltonian is derived, including all relevant magnetoelectric terms whose prefactors are expressed in terms of tight-binding parameters. We confirm the existence of an expected axion-type pseudoscalar term, which turns out to have the same sign and about twice the magnitude of the previously obtained out-of-plane counterpart. Additionally, small anisotropic corrections to the magnetoelectric tensor are found that are fundamentally related to the skew interlayer hopping parameter gamma(4). We discuss possible ways to identify magnetoelectric effects by distinctive features in the optical conductivity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BAND-STRUCTURE; MULTIFERROICS; TRANSPORT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2020 14:17 |
| Last Modified: | 31 Mar 2020 14:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26430 |
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