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Kim, Sungmin ; Schwenk, Johannes ; Walkup, Daniel ; Zeng, Yihang ; Ghahari, Fereshte ; Le, Son T. ; Slot, Marlou R. ; Berwanger, Julian ; Blankenship, Steven R. ; Watanabe, Kenji ; Taniguchi, Takashi ; Giessibl, Franz J. ; Zhitenev, Nikolai B. ; Dean, Cory R. ; Stroscio, Joseph A.

Edge channels of broken-symmetry quantum Hall states in graphene visualized by atomic force microscopy

Kim, Sungmin , Schwenk, Johannes , Walkup, Daniel , Zeng, Yihang, Ghahari, Fereshte, Le, Son T., Slot, Marlou R. , Berwanger, Julian , Blankenship, Steven R., Watanabe, Kenji , Taniguchi, Takashi, Giessibl, Franz J., Zhitenev, Nikolai B., 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, p. 2852.

Date of publication of this fulltext: 05 Nov 2021 08:53
Article
DOI to cite this document: 10.5283/epub.50973


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 ...

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.



Involved Institutions


Details

Item typeArticle
Journal or Publication TitleNature Communications
Publisher:Nature
Place of Publication:BERLIN
Volume:12
Page Range:p. 2852
Date14 May 2021
InstitutionsPhysics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl
Identification Number
ValueType
10.1038/s41467-021-22886-7DOI
KeywordsBERRYS PHASE; CONDUCTANCE;
Dewey Decimal Classification500 Science > 530 Physics
StatusPublished
RefereedYes, this version has been refereed
Created at the University of RegensburgPartially
URN of the UB Regensburgurn:nbn:de:bvb:355-epub-509733
Item ID50973

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