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One-dimensional proximity superconductivity in the quantum Hall regime
We show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime.
- Julien Barrier
- , Minsoo Kim
- & A. K. Geim
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Direct observation of a magnetic-field-induced Wigner crystal
A magnetic-field-induced Wigner crystal in Bernal-stacked bilayer graphene was directly imaged using high-resolution scanning tunnelling microscopy and its structural properties as a function of electron density, magnetic field and temperature were examined.
- Yen-Chen Tsui
- , Minhao He
- & Ali Yazdani
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Article |
Fractional quantum anomalous Hall effect in multilayer graphene
Integer and fractional quantum anomalous Hall effects in a rhombohedral pentalayer graphene–hBN moiré superlattice are observed, providing an ideal platform for exploring charge fractionalization and (non-Abelian) anyonic braiding at zero magnetic field.
- Zhengguang Lu
- , Tonghang Han
- & Long Ju
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Article
| Open Access
Light-driven nanoscale vectorial currents
Vectorial optoelectronic metasurfaces are described, showing that light pulses can be used to drive and direct local charge flows around symmetry-broken plasmonic nanostructures, leading to tunable responses in terahertz emission.
- Jacob Pettine
- , Prashant Padmanabhan
- & Hou-Tong Chen
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Article |
Evidence for chiral supercurrent in quantum Hall Josephson junctions
Ultra-narrow quantum Hall Josephson junctions defined in encapsulated graphene nanoribbons exhibit a chiral supercurrent, visible up to 8 T.
- Hadrien Vignaud
- , David Perconte
- & Benjamin Sacépé
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Imaging quantum oscillations and millitesla pseudomagnetic fields in graphene
Imaging of quantum oscillations in Bernal-stacked trilayer graphene with dual gates enables high-precision reconstruction of the highly tunable bands and reveals naturally occurring pseudomagnetic fields as low as 1 mT corresponding to graphene twisting by 1 millidegree.
- Haibiao Zhou
- , Nadav Auerbach
- & Eli Zeldov
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Ultralow-resistance electrochemical capacitor for integrable line filtering
A miniaturized narrow-channel in-plane electrochemical capacitor shows drastically reduced ionic resistances within both the electrode material and the electrolyte and an ultrahigh areal capacitance by downscaling the channel width with femtosecond-laser scribing.
- Yajie Hu
- , Mingmao Wu
- & Liangti Qu
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Article |
Orbital multiferroicity in pentalayer rhombohedral graphene
Orbital multiferroicity reported in pentalayer rhombohedral graphene features ferro-orbital-magnetism and ferro-valleytricity, both of which can be controlled by an electric field.
- Tonghang Han
- , Zhengguang Lu
- & Long Ju
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Tunable electron–flexural phonon interaction in graphene heterostructures
Experimental observation and calculations show that broken reflection symmetry in graphene heterostructures allows tunable electron–flexural phonon coupling, providing a way to control quantum matter at the atomic scale.
- Mir Mohammad Sadeghi
- , Yajie Huang
- & Li Shi
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Giant magnetoresistance of Dirac plasma in high-mobility graphene
A Dirac plasma in high-mobility graphene shows anomalous magnetotransport and giant magnetoresistance that reaches more than 100 per cent in a low magnetic field at room temperature.
- Na Xin
- , James Lourembam
- & Alexey I. Berdyugin
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Evidence for Dirac flat band superconductivity enabled by quantum geometry
The authors investigate the effect of small velocity in a superconducting Dirac flat band system, finding evidence for small pairs and that superfluid stiffness is not dominated by kinetic energy.
- Haidong Tian
- , Xueshi Gao
- & Marc W. Bockrath
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Imaging hydrodynamic electrons flowing without Landauer–Sharvin resistance
At elevated temperatures, electron hydrodynamics efficiently eliminate the ‘bulk Landauer–Sharvin’ resistance, demonstrating that hydrodynamics can dramatically modify the well-established rules obeyed by ballistic electrons.
- C. Kumar
- , J. Birkbeck
- & S. Ilani
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Imaging tunable quantum Hall broken-symmetry orders in graphene
Three tunable quantum Hall broken-symmetry states in charge-neutral graphene are identified by visualizing their lattice-scale order with scanning tunnelling microscopy and spectroscopy.
- Alexis Coissard
- , David Wander
- & Benjamin Sacépé
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Spin splitting of dopant edge state in magnetic zigzag graphene nanoribbons
Decoupling spin-polarized edge states using substitutional N-atom dopants along the edges of a zigzag graphene nanoribbon (ZGNR) reveals giant spin splitting of a N-dopant edge state, and supports the predicted emergent magnetic order in ZGNRs.
- Raymond E. Blackwell
- , Fangzhou Zhao
- & Felix R. Fischer
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Article |
Superconductivity in rhombohedral trilayer graphene
Superconductivity is observed in rhombohedral trilayer graphene in the absence of a moiré superlattice, with two distinct superconducting states both occurring at a symmetry-breaking transition where the Fermi surface degeneracy changes.
- Haoxin Zhou
- , Tian Xie
- & Andrea F. Young
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Half- and quarter-metals in rhombohedral trilayer graphene
A study shows that rhombohedral graphene is an ideal platform for well-controlled tests of many-body theory and reveals that magnetism in moiré materials is fundamentally itinerant in nature.
- Haoxin Zhou
- , Tian Xie
- & Andrea F. Young
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Long-range nontopological edge currents in charge-neutral graphene
Nanoscale imaging of edge currents in charge-neutral graphene shows that charge accumulation can explain various exotic nonlocal transport measurements, bringing into question some theories about their origins.
- A. Aharon-Steinberg
- , A. Marguerite
- & E. Zeldov
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Article |
Flavour Hund’s coupling, Chern gaps and charge diffusivity in moiré graphene
Chemical potential measurements in twisted bilayer graphene reveal the importance of Coulomb repulsion and exchange interactions in the symmetry-broken ground state, and provide the charge diffusivity in the strange-metal regime.
- Jeong Min Park
- , Yuan Cao
- & Pablo Jarillo-Herrero
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Matters Arising |
Reply to: On the measured dielectric constant of amorphous boron nitride
- Seokmo Hong
- , Min-Hyun Lee
- & Hyeon Suk Shin
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Article |
Electrical switching of magnetic order in an orbital Chern insulator
Non-volatile electrical switching of magnetic order in an orbital Chern insulator is experimentally demonstrated using a moiré heterostructure and analysis shows that the effect is driven by topological edge states.
- H. Polshyn
- , J. Zhu
- & A. F. Young
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Article |
Graphene-based Josephson junction microwave bolometer
An ultimately thin microwave bolometric sensor based on a superconductor–graphene–superconductor Josephson junction with monolayer graphene has a sensitivity approaching the fundamental limit imposed by intrinsic thermal fluctuations.
- Gil-Ho Lee
- , Dmitri K. Efetov
- & Kin Chung Fong
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Bolometer operating at the threshold for circuit quantum electrodynamics
A thermal detector based on a graphene monolayer operates at the threshold for circuit quantum electrodynamics applications, achieving a minimum time constant of 200 ns.
- R. Kokkoniemi
- , J.-P. Girard
- & M. Möttönen
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Tunable spin-polarized correlated states in twisted double bilayer graphene
Twisted double bilayer graphene devices show tunable spin-polarized correlated states that are sensitive to electric and magnetic fields, providing further insights into correlated states in two-dimensional moiré materials.
- Xiaomeng Liu
- , Zeyu Hao
- & Philip Kim
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Untying the insulating and superconducting orders in magic-angle graphene
Tuning the electronic interactions by changing the dielectric environment of twisted bilayer graphene reveals the disappearance of the insulating states and their replacement by superconducting phases, suggesting a competition between the two phases.
- Petr Stepanov
- , Ipsita Das
- & Dmitri K. Efetov
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Cascade of phase transitions and Dirac revivals in magic-angle graphene
Local electronic compressibility measurements of magic-angle twisted bilayer graphene show that the insulating and superconducting phases of this system are both derived from a high-energy symmetry-broken state.
- U. Zondiner
- , A. Rozen
- & S. Ilani
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Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene
Small-angle twisted bilayer–bilayer graphene is tunable by the twist angle and electric and magnetic fields, and can be used to gain further insights into correlated states in two-dimensional superlattices.
- Yuan Cao
- , Daniel Rodan-Legrain
- & Pablo Jarillo-Herrero
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Article |
Mapping the twist-angle disorder and Landau levels in magic-angle graphene
SQUID-on-tip tomographic imaging of Landau levels in magic-angle graphene provides nanoscale maps of local twist-angle disorder and shows that its properties are fundamentally different from common types of disorder.
- A. Uri
- , S. Grover
- & E. Zeldov
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Article |
Tunable correlated Chern insulator and ferromagnetism in a moiré superlattice
A topological Chern insulating state is reported to emerge from strong correlations in flat moiré bands in a graphene superlattice and by applying a vertical electric field the Chern number is switched.
- Guorui Chen
- , Aaron L. Sharpe
- & Feng Wang
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Article |
Visualizing Poiseuille flow of hydrodynamic electrons
The emergence of a liquid-like electronic flow from ballistic flow in graphene is imaged, and an almost-ideal viscous hydrodynamic fluid of electrons exhibiting a parabolic Poiseuille flow profile is observed.
- Joseph A. Sulpizio
- , Lior Ella
- & Shahal Ilani
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Article |
Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene
The fabrication of magic-angle twisted bilayer graphene devices with highly uniform twist angles enables the observation of new superconducting domes, orbital magnets and Chern insulating states.
- Xiaobo Lu
- , Petr Stepanov
- & Dmitri K. Efetov
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Article |
Imaging work and dissipation in the quantum Hall state in graphene
Imaging studies show that topological protection in the quantum Hall state in graphene is undermined by edge reconstruction with a dissipation mechanism that comprises two distinct and spatially separated processes—work generation and entropy generation.
- A. Marguerite
- , J. Birkbeck
- & E. Zeldov
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Letter |
Signatures of tunable superconductivity in a trilayer graphene moiré superlattice
By varying the vertical displacement field in a trilayer graphene and hexagonal boron nitride moiré superlattice, transitions can be observed from the superconducting phase to Mott insulator and metallic phases.
- Guorui Chen
- , Aaron L. Sharpe
- & Feng Wang
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Letter |
Spin–orbit-driven band inversion in bilayer graphene by the van der Waals proximity effect
By enhancing the spin–orbit coupling in bilayer graphene using the proximity effect in a van der Waals heterostructure, band inversion occurs and an incompressible, gapped phase is produced.
- J. O. Island
- , X. Cui
- & A. F. Young
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Letter |
Engineering of robust topological quantum phases in graphene nanoribbons
Graphene nanoribbons are used to design robust nanomaterials with controlled periodic coupling of topological boundary states to create quasi-one-dimensional trivial and non-trivial electronic quantum phases.
- Oliver Gröning
- , Shiyong Wang
- & Roman Fasel
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Letter |
Heterointerface effects in the electrointercalation of van der Waals heterostructures
The electrointercalation of lithium into van der Waals heterostructures of graphene, hexagonal boron nitride and molybdenum dichalcogenides is studied at the level of individual atomic interfaces.
- D. Kwabena Bediako
- , Mehdi Rezaee
- & Philip Kim
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Letter |
Correlated insulator behaviour at half-filling in magic-angle graphene superlattices
When the two graphene sheets in a van der Waals heterostructure are twisted relative to each other by a specific amount, Mott-like insulating phases are observed at half-filling.
- Yuan Cao
- , Valla Fatemi
- & Pablo Jarillo-Herrero
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Article |
Unconventional superconductivity in magic-angle graphene superlattices
A superlattice consisting of two graphene sheets twisted relative to each other by a specific amount exhibits superconductivity when doped electrostatically, with a relatively high critical temperature.
- Yuan Cao
- , Valla Fatemi
- & Pablo Jarillo-Herrero
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Letter |
Tunable interacting composite fermion phases in a half-filled bilayer-graphene Landau level
Various fractional quantum Hall phases are observed in a new generation of bilayer-graphene-based van der Waals heterostructures, including an even-denominator state predicted to harbour non-Abelian anyons.
- A. A. Zibrov
- , C. Kometter
- & A. F. Young
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Letter |
Nanoscale thermal imaging of dissipation in quantum systems
A cryogenic thermal imaging technique that uses a superconducting quantum interference device fabricated on the tip of a sharp pipette can be used to image the thermal signature of extremely low power nanometre-scale dissipation processes.
- D. Halbertal
- , J. Cuppens
- & E. Zeldov
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Letter |
Room-temperature magnetic order on zigzag edges of narrow graphene nanoribbons
In graphene nanoribbons of ‘zigzag’ edge orientation, the edges host unpaired electron spins that couple to generate long-range magnetic order (switching from antiferromagnetic to ferromagnetic inter-edge configuration as the ribbon width increases) under ambient conditions, enhancing the prospects for graphene-based spintronic devices.
- Gábor Zsolt Magda
- , Xiaozhan Jin
- & Levente Tapasztó
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Letter |
Piezoelectricity of single-atomic-layer MoS2 for energy conversion and piezotronics
The two-dimensional semiconducting material molybdenum disulphide shows strong piezoelectricity in its single-layered form, suggesting possible applications in nanoscale electromechanical devices for sensing and energy harvesting.
- Wenzhuo Wu
- , Lei Wang
- & Zhong Lin Wang
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Letter |
Exceptional ballistic transport in epitaxial graphene nanoribbons
Nanoribbons of graphene grown on electronics-grade silicon carbide conduct electrons much better than expected; at room temperature, the charge carriers travel through the nanoribbons without scattering for a surprisingly long distance, more than ten micrometres.
- Jens Baringhaus
- , Ming Ruan
- & Walt A. de Heer
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Letter |
Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
Applying a very large magnetic field to charge-neutral monolayer graphene produces a symmetry-protected quantum spin Hall state with helical edge states whose properties can be modulated by balancing the applied field against an intrinsic antiferromagnetic instability.
- A. F. Young
- , J. D. Sanchez-Yamagishi
- & P. Jarillo-Herrero
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Letter |
Hofstadter’s butterfly and the fractal quantum Hall effect in moiré superlattices
Moiré superlattices arising in bilayer graphene coupled to hexagonal boron nitride provide a periodic potential modulation on a length scale ideally suited to studying the fractal features of the Hofstadter energy spectrum in large magnetic fields.
- C. R. Dean
- , L. Wang
- & P. Kim
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Letter |
Cloning of Dirac fermions in graphene superlattices
Placing graphene on a boron nitride substrate and accurately aligning their crystallographic axes, to form a moiré superlattice, leads to profound changes in the graphene’s electronic spectrum.
- L. A. Ponomarenko
- , R. V. Gorbachev
- & A. K. Geim
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Outlook |
Perspective: A glint of the future
The same property that gives stained glass windows their sublime beauty is being crafted in the latest nanophotonic technologies, says Anatoly V. Zayats.
- Anatoly V. Zayats
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News |
Graphene towers promise 'flexi-electronics'
The 3D ‘monoliths’ — grown between forming ice crystals — add elasticity to the super-strength and conductivity of graphene sheets.
- James Mitchell Crow
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Outlook |
Bioelectronics: The bionic material
Graphene could make an ideal basis for a medical repair kit.
- Charles Schmidt
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Outlook |
Electronics: Back to analogue
Trying to shoehorn graphene into a digital circuit isn't working. But there may be another potential path to glory.
- Katherine Bourzac
Control of proton transport and hydrogenation in double-gated graphene