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Unconventional superconductivity in magic-angle graphene superlattices
TLDR
The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.
Correlated insulator behaviour at half-filling in magic-angle graphene superlattices
TLDR
It is shown experimentally that when this angle is close to the ‘magic’ angle the electronic band structure near zero Fermi energy becomes flat, owing to strong interlayer coupling, and these flat bands exhibit insulating states at half-filling, which are not expected in the absence of correlations between electrons.
Direct-bandgap properties and evidence for ultraviolet lasing of hexagonal boron nitride single crystal
TLDR
HBN is shown to be a promising material for compact ultraviolet laser devices because it has a direct bandgap in the ultraviolet region and evidence for room-temperature ultraviolet lasing at 215 nm by accelerated electron excitation is provided.
Hunting for monolayer boron nitride: optical and Raman signatures.
We describe the identification of single- and few- layer boron nitride. Its optical contrast is much smaller than that of graphene but even monolayers are discernable by optimizing viewing
Mechanical properties of atomically thin boron nitride and the role of interlayer interactions
TLDR
It is reported that high-quality single-crystalline mono- and few-layer BN nanosheets are one of the strongest electrically insulating materials and more intriguingly, few- Layer BN shows mechanical behaviours quite different from those of few- layer graphene under indentation.
Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
TLDR
Evidence is presented that near three-quarters of the filling of the conduction miniband, these enhanced interactions drive the twisted bilayer graphene into a ferromagnetic state, and measurements suggest that the system may be an incipient Chern insulator.
Magic-angle graphene superlattices: a new platform for unconventional superconductivity
Yuan Cao, ∗ Valla Fatemi, Shiang Fang, Kenji Watanabe, Takashi Taniguchi, Efthimos Kaxiras, 4 and Pablo Jarillo-Herrero † Department of Physics, Massachusetts Institute of Technology, Cambridge,
Hot Carrier–Assisted Intrinsic Photoresponse in Graphene
TLDR
The intrinsic optoelectronic response of high-quality dual-gated monolayer and bilayer graphene p-n junction devices is reported, providing strong evidence that nonlocal hot carrier transport, rather than the photovoltaic effect, dominates the intrinsic photoresponse in graphene.
Highly confined low-loss plasmons in graphene-boron nitride heterostructures.
TLDR
This Article exploits near-field microscopy to image propagating plasmons in high-quality graphene encapsulated between two films of hexagonal boron nitride (h-BN), and finds unprecedentedly low plasmon damping combined with strong field confinement and confirms the high uniformity of this plAsmonic medium.
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