Drexler, C. and Tarasenko, S. A. and Olbrich, P. and Karch, J. and Hirmer, M. and Mueller, F. and Gmitra, M. and Fabian, J. and Yakimova, R. and Lara-Avila, S. and Kubatkin, S. and Wang, M. and Vajtai, R. and Ajayan, P. M. and Kono, J. and Ganichev, S. D. (2013) Magnetic quantum ratchet effect in graphene. NATURE NANOTECHNOLOGY, 8 (2). pp. 104-107. ISSN 1748-3387, 1748-3395
Full text not available from this repository. (Request a copy)Abstract
A periodically driven system with spatial asymmetry can exhibit a directed motion facilitated by thermal or quantum fluctuations(1). This so-called ratchet effect(2) has fascinating ramifications in engineering and natural sciences(3-18). Graphene(19) is nominally a symmetric system. Driven by a periodic electric field, no directed electric current should flow. However, if the graphene has lost its spatial symmetry due to its substrate or adatoms, an electronic ratchet motion can arise. We report an experimental demonstration of such an electronic ratchet in graphene layers, proving the underlying spatial asymmetry. The orbital asymmetry of the Dirac fermions is induced by an in-plane magnetic field, whereas the periodic driving comes from terahertz radiation. The resulting magnetic quantum ratchet transforms the a.c. power into a d.c. current, extracting work from the out-of-equilibrium electrons driven by undirected periodic forces. The observation of ratchet transport in this purest possible two-dimensional system indicates that the orbital effects may appear and be substantial in other two-dimensional crystals such as boron nitride, molybdenum dichalcogenides and related heterostructures. The measurable orbital effects in the presence of an in-plane magnetic field provide strong evidence for the existence of structure inversion asymmetry in graphene.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSPORT; MOTION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Apr 2020 05:23 |
| Last Modified: | 27 Apr 2020 05:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17209 |
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