The Triggering Role of Carrier Mobility in the Fractional Quantum Hall Effect Formation—An Evidence in Graphene

作     者：Janusz Jacak Lucjan Jacak 

作者机构：Institute of PhysicsWroclaw University of TechnologyWroclawPoland 

出 版 物：《Journal of Modern Physics》 (现代物理（英文）)

年 卷 期：2013年第4卷第12期

页      面：1591-1596页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：Supported by Polish National Center of Science Project no:DEC-2011/02/A/ST3/001 

主　　题：Graphene FQHE Braid Groups Composite Fermions 

摘      要：Recent experiments with suspended graphene have indicated the crucial role of carrier mobility in the competition between Laughlin collective state and insulating state, probably of Wigner-crystal-type. Moreover, the fractional quantum Hall effect (FQHE) in graphene has been observed at a low carrier density where the interaction is reduced as a result of particles dilution. This suggests that the interaction may not be a sole factor in the triggering of FQHE as it was expected basing on the standard formulation of the composite fermion model. Here, the topological arguments are presented to explain the observed features of the FQHE in graphene and the triggering role of carrier mobility in formation of the Laughlin state.