Featured
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Fizeau drag in graphene plasmonics
Direct infrared nano-imaging of plasmonic waves in graphene carrying high current density reveals the Fizeau drag of plasmon polaritons by fast-moving quasi-relativistic electrons.
- Y. Dong
- , L. Xiong
- & D. N. Basov
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Article |
Localization of lattice dynamics in low-angle twisted bilayer graphene
Nano-Raman spectroscopy reveals localization of some vibrational modes in reconstructed twisted bilayer graphene and provides qualitative insights into how electron–phonon coupling affects the vibrational and electronic properties of the material.
- Andreij C. Gadelha
- , Douglas A. A. Ohlberg
- & Ado Jorio
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Article |
Ultrafast machine vision with 2D material neural network image sensors
A two-dimensional semiconductor photodiode array senses and processes optical images simultaneously without latency, and is trained to classify and encode images with high throughput, acting as an artificial neural network.
- Lukas Mennel
- , Joanna Symonowicz
- & Thomas Mueller
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Letter |
Resonantly hybridized excitons in moiré superlattices in van der Waals heterostructures
Excitonic bands in MoSe2/WS2 heterostructures can hybridize, resulting in a resonant enhancement of moiré superlattice effects.
- Evgeny M. Alexeev
- , David A. Ruiz-Tijerina
- & Alexander I. Tartakovskii
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Letter |
Observation of moiré excitons in WSe2/WS2 heterostructure superlattices
Moiré superlattice exciton states are observed in WSe2/WS2 heterostructures with closely aligned layers.
- Chenhao Jin
- , Emma C. Regan
- & Feng Wang
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Letter |
Extremely efficient terahertz high-harmonic generation in graphene by hot Dirac fermions
Efficient terahertz harmonic generation—challenging but important for ultrahigh-speed optoelectronic technologies—is demonstrated in graphene through a nonlinear process that could potentially be generalized to other materials.
- Hassan A. Hafez
- , Sergey Kovalev
- & Dmitry Turchinovich
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Letter |
Gate-tunable frequency combs in graphene–nitride microresonators
Coupling graphene sheets with a silicon nitride ring microresonator allows the nonlinear cavity dynamics to be altered by a gate voltage, resulting in tunable, chip-scale, optical frequency combs.
- Baicheng Yao
- , Shu-Wei Huang
- & Chee Wei Wong
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Letter |
Light-field-driven currents in graphene
Light-field-driven control of electrons in a conductor is demonstrated by inducing a current by laser pulses in graphene that is sensitive to the carrier-envelope phase.
- Takuya Higuchi
- , Christian Heide
- & Peter Hommelhoff
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Letter |
Probing excitonic dark states in single-layer tungsten disulphide
A series of long-lived excitons in a monolayer of tungsten disulphide are found to have strong binding energy and an energy dependence on orbital momentum that significantly deviates from conventional, three-dimensional, behaviour.
- Ziliang Ye
- , Ting Cao
- & Xiang Zhang
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Letter |
Controlling inelastic light scattering quantum pathways in graphene
Inelastic light scattering spectroscopy is a powerful tool in materials science to probe elementary excitations. In a quantum-mechanical picture, these excitations are generated by the incident photons via intermediate electronic transitions. It is now shown that it is possible to manipulate these intermediate 'quantum pathways' using electrostatically doped graphene. A surprising effect is revealed where blocking one pathway results in an increased intensity, unveiling a mechanism of destructive quantum interference between different Raman pathways. The study refines understanding of Raman scattering in graphene and indicates the possibility of controlling quantum pathways to produce unusual inelastic light scattering phenomena.
- Chi-Fan Chen
- , Cheol-Hwan Park
- & Feng Wang
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Letter |
A change in the optical polarization associated with a γ-ray flare in the blazar 3C 279
It is widely accepted that strong and variable radiation detected over all accessible energy bands in a number of active galaxies arises from a relativistic, Doppler-boosted jet pointing close to our line of sight. However, the size of the emitting zone and the location of this region relative to the central supermassive black hole are poorly understood. Here, the coincidence of a γ-ray flare with a dramatic change of optical polarization angle is reported, providing evidence for co-spatiality of optical and γ-ray emission regions and indicating a highly ordered jet magnetic field.
- A. A. Abdo
- , M. Ackermann
- & M. Sikora