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Graphene Acoustic Phonon-Mediated Pseudo-Landau Levels Tailoring Probed by Scanning Tunneling Spectroscopy.
Small ( IF 13.3 ) Pub Date : 2019-12-09 , DOI: 10.1002/smll.201905202
Cheng Chi 1 , Bowen Shi 1 , Cong Liu 1 , Yimin Kang 1 , Li Lin 2 , Meiling Jiang 1 , Jing Lu 1 , Bo Shen 1 , Feng Lin 1 , Hailin Peng 2 , Zheyu Fang 1, 3
Affiliation  

Graphene has attracted great interests in various areas including optoelectronics, spintronics, and nanomechanics due to its unique electronic structure, a linear dispersion with a zero bandgap around the Dirac point. Shifts of Dirac cones in graphene creates pseudo-magnetic field, which generates an energy gap and brings a zero-magnetic-field analogue of the quantum Hall effect. Recent studies have demonstrated that graphene pseudo-magnetic effects can be generated by vacancy defects, atom adsorption, zigzag or armchair edges, and external strain. Here, a larger than 100 T pseudo-magnetic field is reported that generated on the step area of graphene; and with the ultrahigh vacuum scanning tunneling microscopy, the observed Landau levels can be effectively tailored by graphene phonons. The zero pseudo-Landau level is suppressed due to the phonon-mediated inelastic tunneling, and this is observed by the scanning tunneling spectroscopy spectrum and confirmed by the Vienna ab initio simulation package calculation, where graphene phonons modulate the flow of tunneling electrons and further mediate pseudo-Landau levels. These observations demonstrate a viable approach for the control of pseudo-Landau levels, which tailors the electronic structure of graphene, and further ignites applications in graphene valley electronics.

中文翻译:

扫描隧道光谱法探测石墨烯声子介导的伪兰道能级剪裁。

石墨烯因其独特的电子结构,狄拉克点周围零带隙的线性色散而在光电,自旋电子学和纳米力学等各个领域引起了极大的兴趣。石墨烯中狄拉克锥的位移会产生伪磁场,该伪磁场会产生能隙,并带来量子霍尔效应的零磁场模拟。最近的研究表明,空位缺陷,原子吸附,锯齿形或扶手椅形边缘以及外部应变会产生石墨烯伪磁效应。在此,据报道在石墨烯的台阶区域产生了大于100 T的伪磁场。借助超高真空扫描隧道显微镜,可以通过石墨烯声子有效地调整观察到的朗道水平。零伪兰道能级由于声子介导的非弹性隧穿而受到抑制,这可以通过扫描隧穿光谱观察到,并可以通过维也纳从头算模拟软件包计算得到证实,其中石墨烯声子调节隧穿电子的流动并进一步介导伪兰级别。这些观察结果证明了控制伪朗道能级的可行方法,该方法可量身定制石墨烯的电子结构,并进一步点燃石墨烯硅谷电子产品中的应用。
更新日期:2020-01-16
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