Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures

A. Gamucci, D. Spirito, M. Carrega, B. Karmakar, A. Lombardo, M. Bruna, L. N. Pfeiffer, K. W. West, A. C. Ferrari, M. Polini () and V. Pellegrini ()
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A. Gamucci: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore
D. Spirito: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore
M. Carrega: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore
B. Karmakar: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore
A. Lombardo: Cambridge Graphene Centre, University of Cambridge
M. Bruna: Cambridge Graphene Centre, University of Cambridge
L. N. Pfeiffer: Princeton University
K. W. West: Princeton University
A. C. Ferrari: Cambridge Graphene Centre, University of Cambridge
M. Polini: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore
V. Pellegrini: National Enterprise for Nanoscience and Nanotechnology (NEST), Istituto Nanoscienze-Consiglio Nazionale delle Ricerche and Scuola Normale Superiore

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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

Date: 2014
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DOI: 10.1038/ncomms6824

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