scholarly journals In Operando Angle‐Resolved Photoemission Spectroscopy with Nanoscale Spatial Resolution: Spatial Mapping of the Electronic Structure of Twisted Bilayer Graphene

Small Science ◽  
2021 ◽  
pp. 2000075
Author(s):  
Paulina Majchrzak ◽  
Ryan Muzzio ◽  
Alfred J. H. Jones ◽  
Davide Curcio ◽  
Klara Volckaert ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Spatial Resolution ◽  
Bilayer Graphene ◽  
Photoemission Spectroscopy ◽  
Spatial Mapping ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Twisted Bilayer Graphene ◽  
In Operando

scholarly journals Observation of a flat band and bandgap in millimeter-scale twisted bilayer graphene

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Keiju Sato ◽  
Naoki Hayashi ◽  
Takahiro Ito ◽  
Noriyuki Masago ◽  
Makoto Takamura ◽  
...  
Keyword(s):  
Large Angle ◽  
Bilayer Graphene ◽  
Epitaxial Graphene ◽  
Photoemission Spectroscopy ◽  
Flat Band ◽  
Magic Angle ◽  
Graphene Layers ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Twisted Bilayer Graphene ◽  
Micrometer Scale

AbstractMagic-angle twisted bilayer graphene, consisting of two graphene layers stacked at a special angle, exhibits superconductivity due to the maximized density of states at the energy of the flat band. Generally, experiments on twisted bilayer graphene have been performed using micrometer-scale samples. Here we report the fabrication of twisted bilayer graphene with an area exceeding 3 × 5 mm2 by transferring epitaxial graphene onto another epitaxial graphene, and observation of a flat band and large bandgap using angle-resolved photoemission spectroscopy. Our results suggest that the substrate potential induces both the asymmetrical doping in large angle twisted bilayer graphene and the electron doped nature of the flat band in magic-angle twisted bilayer graphene.

scholarly journals Electronic Structure of theYH3Phase from Angle-Resolved Photoemission Spectroscopy

2003 ◽  
Vol 90 (19) ◽  
Author(s):  
J. Hayoz ◽  
C. Koitzsch ◽  
M. Bovet ◽  
D. Naumović ◽  
L. Schlapbach ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Electronic structure ofBaNi2P2observed by angle-resolved photoemission spectroscopy

2014 ◽  
Vol 89 (19) ◽  
Author(s):  
S. Ideta ◽  
T. Yoshida ◽  
M. Nakajima ◽  
W. Malaeb ◽  
H. Kito ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Quasicrystalline 30° twisted bilayer graphene as an incommensurate superlattice with strong interlayer coupling

2018 ◽  
Vol 115 (27) ◽  
pp. 6928-6933 ◽  
Author(s):  
Wei Yao ◽  
Eryin Wang ◽  
Changhua Bao ◽  
Yiou Zhang ◽  
Kenan Zhang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Graphene Layer ◽  
Rotational Symmetry ◽  
Reciprocal Lattice ◽  
Double Resonance ◽  
Interlayer Coupling ◽  
Bilayer Graphene ◽  
Lattice Vector ◽  
Graphene Layers ◽  
Twisted Bilayer Graphene

The interlayer coupling can be used to engineer the electronic structure of van der Waals heterostructures (superlattices) to obtain properties that are not possible in a single material. So far research in heterostructures has been focused on commensurate superlattices with a long-ranged Moiré period. Incommensurate heterostructures with rotational symmetry but not translational symmetry (in analogy to quasicrystals) are not only rare in nature, but also the interlayer interaction has often been assumed to be negligible due to the lack of phase coherence. Here we report the successful growth of quasicrystalline 30° twisted bilayer graphene (30°-tBLG), which is stabilized by the Pt(111) substrate, and reveal its electronic structure. The 30°-tBLG is confirmed by low energy electron diffraction and the intervalley double-resonance Raman mode at 1383 cm−1. Moreover, the emergence of mirrored Dirac cones inside the Brillouin zone of each graphene layer and a gap opening at the zone boundary suggest that these two graphene layers are coupled via a generalized Umklapp scattering mechanism—that is, scattering of a Dirac cone in one graphene layer by the reciprocal lattice vector of the other graphene layer. Our work highlights the important role of interlayer coupling in incommensurate quasicrystalline superlattices, thereby extending band structure engineering to incommensurate superstructures.

scholarly journals Electronic Structure of Sr1−yCayFe2(As1−xPx)2 (x = 0.25, y = 0.08) Revealed by Angle-Resolved Photoemission Spectroscopy

2019 ◽  
Vol 88 (8) ◽  
pp. 084701
Author(s):  
Toru Adachi ◽  
Shinichiro Ideta ◽  
Zi How Tin ◽  
Hidetomo Usui ◽  
Kiyohisa Tanaka ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Electronic structure studies ofBaFe2As2by angle-resolved photoemission spectroscopy

2009 ◽  
Vol 79 (15) ◽  
Author(s):  
J. Fink ◽  
S. Thirupathaiah ◽  
R. Ovsyannikov ◽  
H. A. Dürr ◽  
R. Follath ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy
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