scholarly journals Minibands in twisted bilayer graphene probed by magnetic focusing

2020 ◽  
Vol 6 (16) ◽  
pp. eaay7838 ◽  
Author(s):  
A. I. Berdyugin ◽  
B. Tsim ◽  
P. Kumaravadivel ◽  
S. G. Xu ◽  
A. Ceferino ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Magnetic Fields ◽  
Long Range ◽  
Electron Scattering ◽  
Low Temperatures ◽  
Ballistic Transport ◽  
Bilayer Graphene ◽  
Degree Of Freedom ◽  
Magnetic Focusing ◽  
Twisted Bilayer Graphene

Magnetic fields force ballistic electrons injected from a narrow contact to move along skipping orbits and form caustics. This leads to pronounced resistance peaks at nearby voltage probes as electrons are effectively focused inside them, a phenomenon known as magnetic focusing. This can be used not only for the demonstration of ballistic transport but also to study the electronic structure of metals. Here, we use magnetic focusing to probe narrowbands in graphene bilayers twisted at ~2°. Their minibands are found to support long-range ballistic transport limited at low temperatures by intrinsic electron-electron scattering. A voltage bias between the layers causes strong minivalley splitting and allows selective focusing for different minivalleys, which is of interest for using this degree of freedom in frequently discussed valleytronics.

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 Large-area, periodic, and tunable intrinsic pseudo-magnetic fields in low-angle twisted bilayer graphene

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Haohao Shi ◽  
Zhen Zhan ◽  
Zhikai Qi ◽  
Kaixiang Huang ◽  
Edo van Veen ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Bilayer Graphene ◽  
Large Area ◽  
Twisted Bilayer Graphene

scholarly journals Electronic structure and quantum transport in twisted bilayer graphene with resonant scatterers

2020 ◽  
Vol 101 (24) ◽  
Author(s):  
Omid Faizy Namarvar ◽  
Ahmed Missaoui ◽  
Laurence Magaud ◽  
Didier Mayou ◽  
Guy Trambly de Laissardière
Keyword(s):  
Electronic Structure ◽  
Quantum Transport ◽  
Bilayer Graphene ◽  
Twisted Bilayer Graphene

scholarly journals Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene

Nano Letters ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 2958-2964 ◽  
Author(s):  
Sai S. Sunku ◽  
Alexander S. McLeod ◽  
Tobias Stauber ◽  
Hyobin Yoo ◽  
Dorri Halbertal ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Bilayer Graphene ◽  
Local Electronic Structure ◽  
Twisted Bilayer Graphene

scholarly journals Electronic structure of twisted bilayer graphene

2013 ◽  
Vol 62 (15) ◽  
pp. 157302
Author(s):  
Wu Jiang-Bin ◽  
Zhang Xin ◽  
Tan Ping-Heng ◽  
Feng Zhi-Hong ◽  
Li Jia
Keyword(s):  
Electronic Structure ◽  
Bilayer Graphene ◽  
Twisted Bilayer Graphene

Electronic structure of 3∘ -twisted bilayer graphene on 4H-SiC(0001)

2021 ◽  
Vol 5 (5) ◽  
Author(s):  
Takushi Iimori ◽  
Anton Visikovskiy ◽  
Hitoshi Imamura ◽  
Toshio Miyamachi ◽  
Miho Kitamura ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Bilayer Graphene ◽  
Twisted Bilayer Graphene

scholarly journals Local spectroscopy of moiré-induced electronic structure in gate-tunable twisted bilayer graphene

2015 ◽  
Vol 92 (15) ◽  
Author(s):  
Dillon Wong ◽  
Yang Wang ◽  
Jeil Jung ◽  
Sergio Pezzini ◽  
Ashley M. DaSilva ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Bilayer Graphene ◽  
Twisted Bilayer Graphene
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