双层石墨烯
材料科学
量子力学
量子自旋霍尔效应
GSM演进的增强数据速率
作者
Sungmin Kim,Johannes Schwenk,Daniel Walkup,Yihang Zeng,Fereshte Ghahari,Son T. Le,M. R. Slot,Julian Berwanger,Steven R. Blankenship,Kenji Watanabe,Takashi Taniguchi,Franz J. Giessibl,Nikolai B. Zhitenev,Cory R. Dean,Joseph A. Stroscio
出处
期刊:arXiv: Mesoscale and Nanoscale Physics
日期:2020-06-18
被引量:3
标识
DOI:10.1038/s41467-021-22886-7
摘要
The quantum Hall (QH) effect, a topologically non-trivial quantum phase, expanded and brought into focus the concept of topological order in physics. The topologically protected quantum Hall edge states are of crucial importance to the QH effect but have been measured with limited success. The QH edge states in graphene take on an even richer role as graphene is distinguished by its four-fold degenerate zero energy Landau level (zLL), where the symmetry is broken by electron interactions on top of lattice-scale potentials but has eluded spatial measurements. In this report, we map the quantum Hall broken-symmetry edge states comprising the graphene zLL at integer filling factors of $\nu=0,\pm 1$ across the quantum Hall edge boundary using atomic force microscopy (AFM). Measurements of the chemical potential resolve the energies of the four-fold degenerate zLL as a function of magnetic field and show the interplay of the moire superlattice potential of the graphene/boron nitride system and spin/valley symmetry-breaking effects in large magnetic fields.
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