Kim, Sungmin and Schwenk, Johannes and Walkup, Daniel and Zeng, Yihang and Ghahari, Fereshte and Le, Son T. and Slot, Marlou R. and Berwanger, Julian and Blankenship, Steven R. and Watanabe, Kenji and Taniguchi, Takashi and Giessibl, Franz J. and Zhitenev, Nikolai B. and Dean, Cory R. and Stroscio, Joseph A. (2021) Edge channels of broken-symmetry quantum Hall states in graphene visualized by atomic force microscopy. NATURE COMMUNICATIONS, 12 (1): 2852. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
The quantum Hall (QH) effect, a topologically non-trivial quantum phase, expanded the concept of topological order in physics bringing into focus the intimate relation between the "bulk" topology and the edge states. The QH effect in 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. However, the broken-symmetry edge states have eluded spatial measurements. In this article, we spatially map the quantum Hall broken-symmetry edge states comprising the graphene zLL at integer filling factors of nu =0,1 across the quantum Hall edge boundary using high-resolution atomic force microscopy (AFM) and show a gapped ground state proceeding from the bulk through to the QH edge boundary. 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.The broken-symmetry edge states that are the hallmark of the quantum Hall effect in graphene have eluded spatial measurements. Here, the authors spatially map the quantum Hall broken-symmetry edge states using atomic force microscopy and show a gapped ground state proceeding from the bulk through to the quantum Hall edge boundary.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BERRYS PHASE; CONDUCTANCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Sep 2022 06:32 |
| Last Modified: | 21 Sep 2022 06:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47769 |
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