Details
| Original language | English |
|---|---|
| Article number | 1700025 |
| Journal | Annalen der Physik |
| Volume | 529 |
| Issue number | 11 |
| Publication status | Published - 9 Nov 2017 |
Abstract
Twisted Bilayer Graphene may be viewed as very first representative of the now booming class of artificially layered 2D materials. Consisting of two sheets from the same structure and atomic composition, its decisive degree of freedom lies in the rotation between crystallographic axes in the individual graphene monolayers. Geometrical consideration finds angle-dependent Moiré patterns as well as commensurate superlattices of opposite sublattice exchange symmetry. Beyond the approach of rigidly interposed lattices, this review takes focus on the evolving topic of lattice corrugation and distortion in response to spatially varying lattice registry. The experimental approach to twisted bilayers requires a basic control over preparation techniques; important methods are summarized and extended on in the case of bilayers folded from monolayer graphene via AFM nanomachining. Central morphological parameters to the twisted bilayer, rotational mismatch and interlayer separation are studied in a broader base of samples. Finally, experimental evidence for a number of theoretically predicted, controversial electronic scenarios are reviewed; magnetotransport signatures are discussed in terms of Fermi velocity, van Hove singularities and Berry phase and assessed with respect to the underlying experimental conditions, thereby referring back to the initially considered variations in relaxed lattice structure.
Keywords
- Atomic Force Microscope, Graphene, Magnetotransport, Twisted Bilayer
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Annalen der Physik, Vol. 529, No. 11, 1700025, 09.11.2017.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Twisted Bilayer Graphene
T2 - Interlayer Configuration and Magnetotransport Signatures
AU - Rode, Johannes C.
AU - Smirnov, Dmitri
AU - Belke, Christopher
AU - Schmidt, Hennrik
AU - Haug, Rolf J.
N1 - Funding Information: This work was supported by the priority program SPP 1459 “Graphene” of the DFG. Funding Information: This work was supported by the priority program SPP 1459 ?Graphene? of the DFG. J. C. Rode acknowledges support from the Hannover School for Nanotechnology. We thank Patrick Barthold and Thomas L?dtke for valuable input at early stages of the project as well as Hadar Steinberg and Peter Behrens for helpful insight and discussions. The authors have declared no conflict of interest.
PY - 2017/11/9
Y1 - 2017/11/9
N2 - Twisted Bilayer Graphene may be viewed as very first representative of the now booming class of artificially layered 2D materials. Consisting of two sheets from the same structure and atomic composition, its decisive degree of freedom lies in the rotation between crystallographic axes in the individual graphene monolayers. Geometrical consideration finds angle-dependent Moiré patterns as well as commensurate superlattices of opposite sublattice exchange symmetry. Beyond the approach of rigidly interposed lattices, this review takes focus on the evolving topic of lattice corrugation and distortion in response to spatially varying lattice registry. The experimental approach to twisted bilayers requires a basic control over preparation techniques; important methods are summarized and extended on in the case of bilayers folded from monolayer graphene via AFM nanomachining. Central morphological parameters to the twisted bilayer, rotational mismatch and interlayer separation are studied in a broader base of samples. Finally, experimental evidence for a number of theoretically predicted, controversial electronic scenarios are reviewed; magnetotransport signatures are discussed in terms of Fermi velocity, van Hove singularities and Berry phase and assessed with respect to the underlying experimental conditions, thereby referring back to the initially considered variations in relaxed lattice structure.
AB - Twisted Bilayer Graphene may be viewed as very first representative of the now booming class of artificially layered 2D materials. Consisting of two sheets from the same structure and atomic composition, its decisive degree of freedom lies in the rotation between crystallographic axes in the individual graphene monolayers. Geometrical consideration finds angle-dependent Moiré patterns as well as commensurate superlattices of opposite sublattice exchange symmetry. Beyond the approach of rigidly interposed lattices, this review takes focus on the evolving topic of lattice corrugation and distortion in response to spatially varying lattice registry. The experimental approach to twisted bilayers requires a basic control over preparation techniques; important methods are summarized and extended on in the case of bilayers folded from monolayer graphene via AFM nanomachining. Central morphological parameters to the twisted bilayer, rotational mismatch and interlayer separation are studied in a broader base of samples. Finally, experimental evidence for a number of theoretically predicted, controversial electronic scenarios are reviewed; magnetotransport signatures are discussed in terms of Fermi velocity, van Hove singularities and Berry phase and assessed with respect to the underlying experimental conditions, thereby referring back to the initially considered variations in relaxed lattice structure.
KW - Atomic Force Microscope
KW - Graphene
KW - Magnetotransport
KW - Twisted Bilayer
UR - http://www.scopus.com/inward/record.url?scp=85026489916&partnerID=8YFLogxK
U2 - 10.1002/andp.201700025
DO - 10.1002/andp.201700025
M3 - Article
AN - SCOPUS:85026489916
VL - 529
JO - Annalen der Physik
JF - Annalen der Physik
SN - 0003-3804
IS - 11
M1 - 1700025
ER -