Direkt zum Inhalt

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. und Stroscio, Joseph A. (2021) Edge channels of broken-symmetry quantum Hall states in graphene visualized by atomic force microscopy. Nature Communications 12, S. 2852.

Veröffentlichungsdatum dieses Volltextes: 05 Nov 2021 08:53
Artikel
DOI zum Zitieren dieses Dokuments: 10.5283/epub.50973


Zusammenfassung

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.



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Details

DokumentenartArtikel
Titel eines Journals oder einer ZeitschriftNature Communications
Verlag:Nature
Ort der Veröffentlichung:BERLIN
Band:12
Seitenbereich:S. 2852
Datum14 Mai 2021
InstitutionenPhysik > Institut für Experimentelle und Angewandte Physik > Lehrstuhl Professor Giessibl > Arbeitsgruppe Franz J. Giessibl
Identifikationsnummer
WertTyp
10.1038/s41467-021-22886-7DOI
Stichwörter / KeywordsBERRYS PHASE; CONDUCTANCE;
Dewey-Dezimal-Klassifikation500 Naturwissenschaften und Mathematik > 530 Physik
StatusVeröffentlicht
BegutachtetJa, diese Version wurde begutachtet
An der Universität Regensburg entstandenZum Teil
URN der UB Regensburgurn:nbn:de:bvb:355-epub-509733
Dokumenten-ID50973

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