Yahniuk, Ivan and Hild, Marcel and Golub, Leonid E. and Amann, Julia and Eroms, Jonathan and Weiss, Dieter and Kang, Wun-Hao and Liu, Ming-Hao and Watanabe, Kenji and Taniguchi, T. and Ganichev, Sergey D. (2024) Terahertz ratchet in graphene two-dimensional metamaterial formed by a patterned gate with an antidot array. PHYSICAL REVIEW B, 109 (23): 235428. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We report the observation of the terahertz-induced ratchet effect in graphene-based two-dimensional (2D) metamaterials. The metamaterial consists of a graphite gate patterned with an array of triangular antidots placed under a graphene monolayer. We show that the ratchet current appears due to the noncentrosymmetry of the periodic structure unit cell. The ratchet current is generated owing to the combined action of a spatially periodic in-plane electrostatic potential and a periodically modulated radiation electric field caused by near-field diffraction. The magnitude and direction of the ratchet current are shown to be controlled by voltages applied to both back and patterned gates, which change the lateral asymmetry, carrier type, and density. The phenomenological and microscopic theories of ratchet effects in graphene-based 2D metamaterials are developed. The experimental data are discussed in the light of the theory based on the solution of the Boltzmann kinetic equation and the calculated electrostatic potential profile. The theory describes well all the experimental results and shows that the observed ratchet current consists of the Seebeck thermoratchet contribution as well as the linear ratchet one, which is sensitive to the orientation of the radiation electric field vector with respect to the triangles.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BROWNIAN MOTORS; RADIATION; TRANSPORT; RECTIFICATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Oct 2025 08:12 |
| Last Modified: | 14 Oct 2025 08:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64610 |
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