Tunnel and electrostatic coupling in graphene-LaAlO3/SrTiO3 hybrid systems

TitleTunnel and electrostatic coupling in graphene-LaAlO3/SrTiO3 hybrid systems
Publication TypeJournal Article
Year of Publication2016
AuthorsAliaj, I.., I.. Torre, V.. Miseikis, E.. di Gennaro, A.. Sambri, A.. Gamucci, C.. Coletti, F.. Beltram, F.. M. Granozio, M.. Polini, V.. Pellegrini, and S.. Roddaro
JournalAPL Materials
Date Published06/2016
Keywordselectrical contacts, electrical-characterization, electrical-probing, Graphene, hybrid systems, leakage current, nanoprobing, soft contact

We report on the transport properties of hybrid devices obtained by depositing graphene on a LaAlO3/SrTiO3 oxide junction hosting a 4 nm-deep 2-dimensional electron system. At low graphene-oxide inter-layer bias, the two electron systems are electrically isolated, despite their small spatial separation. A very efficient reciprocal gating of the two neighboring 2-dimensional systems is shown. A pronounced rectifying behavior is observed for larger bias values and ascribed to the interplay between electrostatic field-effects and tunneling across the LaAlO3 barrier. The relevance of these results in the context of strongly coupled bilayer systems is discussed.