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  • Drexler, CUniversity of Regensburg, Germany (author)

Magnetic quantum ratchet effect in graphene

  • Article/chapterEnglish2013

Publisher, publication year, extent ...

  • 2013-01-20
  • Nature Publishing Group,2013
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:liu-90081
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-90081URI
  • https://doi.org/10.1038/nnano.2012.231DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Funding Agencies|German Research Foundation (DFG)|SPP 1459GRK 1570SFB 689|European Union through ConceptGraphene||International Bureau of the Federal Ministry of Education and Research (BMBF) at the German Aerospace Center (DLR)||Russian Foundation for Basic Research (RFBR)||Russian Federation|MD-2062.2012.2|Dynasty Foundation||
  • 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.

Subject headings and genre

  • TECHNOLOGY
  • TEKNIKVETENSKAP

Added entries (persons, corporate bodies, meetings, titles ...)

  • Tarasenko, S A.Russian Academic Science, Russia (author)
  • Olbrich, PUniversity of Regensburg, Germany (author)
  • Karch, JUniversity of Regensburg, Germany (author)
  • Hirmer, MUniversity of Regensburg, Germany (author)
  • Mueller, FUniversity of Regensburg, Germany (author)
  • Gmitra, MUniversity of Regensburg, Germany (author)
  • Fabian, JUniversity of Regensburg, Germany (author)
  • Yakimova, RositsaLinköpings universitet,Halvledarmaterial,Tekniska högskolan(Swepub:liu)rosia15 (author)
  • Lara-Avila, SChalmers, Sweden (author)
  • Kubatkin, SChalmers, Sweden (author)
  • Wang, MRice University, TX USA (author)
  • Vajtai, RRice University, TX USA (author)
  • Ajayan, P MRice University, TX USA (author)
  • Kono, JRice University, TX USA (author)
  • Ganichev, S D.University of Regensburg, Germany (author)
  • University of Regensburg, GermanyRussian Academic Science, Russia (creator_code:org_t)

Related titles

  • In:Nature Nanotechnology: Nature Publishing Group8:2, s. 104-1071748-33871748-3395

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