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Coulomb drag of massless fermions in graphene

2011; American Physical Society; Volume: 83; Issue: 16 Linguagem: Inglês

10.1103/physrevb.83.161401

1550-235X

Seyoung Kim, Insun Jo, Junghyo Nah, Zhen Yao, S. Banerjee, Emanuel Tutuc,

Topological Materials and Phenomena

Using a novel structure, consisting of two, independently contacted graphene single layers separated by an ultra-thin dielectric, we experimentally measure the Coulomb drag of massless fermions in graphene. At temperatures higher than 50 K, the Coulomb drag follows a temperature and carrier density dependence consistent with the Fermi liquid regime. As the temperature is reduced, the Coulomb drag exhibits giant fluctuations with an increasing amplitude, thanks to the interplay between coherent transport in the graphene layer and interaction between the two layers.