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

• 作者: Janusz Jacak Lucjan Jacak
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: GRAPHENE FQHE BRAID GROUPS Composite FERMIONS
• 年，卷（期）: 2013,（12）
• 页码范围: 1591-1596
• 页数: 6页
• 分类号: R73

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.