Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures (Articolo in rivista)

Type
Label
  • Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/ncomms6824 (literal)
Alternative label
  • Gamucci, A.; Spirito, D.; Carrega, M.; Karmakar, B.; Lombardo, A.; Bruna, M.; Pfeiffer, L. N.; West, K. W.; Ferrari, A. C.; Polini, M.; Pellegrini, V. (2014)
    Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures
    in Nature communications
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gamucci, A.; Spirito, D.; Carrega, M.; Karmakar, B.; Lombardo, A.; Bruna, M.; Pfeiffer, L. N.; West, K. W.; Ferrari, A. C.; Polini, M.; Pellegrini, V. (literal)
Pagina inizio
  • 5824 (literal)
Pagina fine
  • 5824 (literal)
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  • 5 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR; Scuola Normale Super Pisa; Univ Cambridge; Princeton Univ; Ist Italiano Tecnol (literal)
Titolo
  • Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures (literal)
Abstract
  • Vertical heterostructures combining different layered materials offer novel opportunities for applications and fundamental studies. Here we report a new class of heterostructures comprising a single-layer (or bilayer) graphene in close proximity to a quantum well created in GaAs and supporting a high-mobility two-dimensional electron gas. In our devices, graphene is naturally hole-doped, thereby allowing for the investigation of electron-hole interactions. We focus on the Coulomb drag transport measurements, which are sensitive to many-body effects, and find that the Coulomb drag resistivity significantly increases for temperatures <5-10 K. The low-temperature data follow a logarithmic law, therefore displaying a notable departure from the ordinary quadratic temperature dependence expected in a weakly correlated Fermi-liquid. This anomalous behaviour is consistent with the onset of strong interlayer correlations. Our heterostructures represent a new platform for the creation of coherent circuits and topologically protected quantum bits. (literal)
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