Single-particle probing of edge-state formation in a graphene nanoribbon
Single-particle probing of edge-state formation in a graphene nanoribbon
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石墨烯纳米带边缘态形成的单粒子探测
DOI：
10.1103/physrevb.85.205452
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发表时间：
2012
影响因子：
3.7
通讯作者：
Chiu K
中科院分区：
文献类型：
--
作者：
Chiu K
我们研究了垂直磁场对嵌入纳米带的石墨烯量子点单粒子充电谱的影响。我们观察到单粒子光谱的均匀位移与磁导峰一致，暗示朗道能级凝聚和边缘态形成是磁场增强通过石墨烯纳米结构的机制。实验确定的体态与边缘态的比例得到了单粒子带结构模拟的支持，而库仑阻塞传输振幅的四倍振荡表明，在朗道能级冷凝过程中存在多体相互作用效应。
We investigate the effect of a perpendicular magnetic field on the single-particle charging spectrum of a graphene quantum dot embedded inline with a nanoribbon. We observe uniform shifts in the single-particle spectrum which coincide with peaks in the magnetoconductance, implicating Landau level condensation and edge state formation as the mechanism underlying magnetic field-enhanced transmission through graphene nanostructures. The experimentally determined ratio of bulk to edge states is supported by single-particle band-structure simulations, while a fourfold beating of the Coulomb blockade transmission amplitude points to many-body interaction effects during Landau level condensation of thestate.