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Accessing the transport properties of graphene and its multilayers at high carrier density.


ABSTRACT: We present a comparative study of high carrier density transport in mono-, bi-, and trilayer graphene using electric double-layer transistors to continuously tune the carrier density up to values exceeding 10(14) cm(-2). Whereas in monolayer the conductivity saturates, in bi- and trilayer filling of the higher-energy bands is observed to cause a nonmonotonic behavior of the conductivity and a large increase in the quantum capacitance. These systematic trends not only show how the intrinsic high-density transport properties of graphene can be accessed by field effect, but also demonstrate the robustness of ion-gated graphene, which is crucial for possible future applications.

SUBMITTER: Ye J 

PROVIDER: S-EPMC3156196 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature

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Accessing the transport properties of graphene and its multilayers at high carrier density.

Ye Jianting J   Craciun Monica F MF   Koshino Mikito M   Russo Saverio S   Inoue Seiji S   Yuan Hongtao H   Shimotani Hidekazu H   Morpurgo Alberto F AF   Iwasa Yoshihiro Y  

Proceedings of the National Academy of Sciences of the United States of America 20110726 32


We present a comparative study of high carrier density transport in mono-, bi-, and trilayer graphene using electric double-layer transistors to continuously tune the carrier density up to values exceeding 10(14) cm(-2). Whereas in monolayer the conductivity saturates, in bi- and trilayer filling of the higher-energy bands is observed to cause a nonmonotonic behavior of the conductivity and a large increase in the quantum capacitance. These systematic trends not only show how the intrinsic high-  ...[more]

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