Journal Article

FZJ-2024-03019

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Band gap formation in commensurate twisted bilayer graphene/hBN moiré lattices

Rothstein, A. (Corresponding author)RWTH* ; Schattauer, C. ; Dolleman, R. J.RWTH* ; Trellenkamp, S.FZJ* ; Lentz, F.FZJ* ; Watanabe, K. ; Taniguchi, T. ; Kennes, D. M. ; Beschoten, B.RWTH* ; Stampfer, C. (Corresponding author)FZJ* ; Libisch, F. (Corresponding author)

2024
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.109.155139  doi:10.34734/FZJ-2024-03019

Abstract: We report on the investigation of periodic superstructures in twisted bilayer graphene (tBLG) van der Waals heterostructures, where one of the graphene layers is aligned to hexagonal boron nitride (hBN). Our theoretical simulations reveal that if the ratio of the resulting two moiré unit-cell areas is a simple fraction, the graphene/hBN moiré lattice acts as a staggered potential, breaking the degeneracy between tBLG AA sites. This leads to additional band gaps at energies where a subset of tBLG AA sites is fully occupied. These gaps manifest as Landau fans in magnetotransport, which we experimentally observe in an aligned tBLG/hBN heterostructure. Our study demonstrates the identification of commensurate tBLG/hBN van der Waals heterostructures by magnetotransport, highlights the persistence of moiré effects on length scales of tens of nanometers, and represents an interesting step forward in the ongoing effort to realize designed quantum materials with tailored properties.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)
3. Helmholtz - Nanofacility (HNF)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. DFG project 437214324 - Durchstimmbare Twistronics: Lokales Tuning und lokale Detektion topologischer Randzustände und Supraleitung in Zweilagigen-Graphen (437214324) (437214324)
3. DFG project 436607160 - NEMS Sensoren aus 2D-Material-Heterostrukturen (436607160) (436607160)
4. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
5. DFG project 443273985 - Mikroskopische Beschreibung von Korrelationseffekten in verdrehten van der Waals [Hetero]Strukturen (443273985) (443273985)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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