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Imaging viscous flow of the Dirac fluid in graphene
Viscous Dirac fluid flow in room-temperature graphene is imaged using quantum diamond magnetometry, revealing a parabolic Poiseuille profile for electron flow in a high-mobility graphene channel near the charge-neutrality point.
- Mark J. H. Ku
- , Tony X. Zhou
- & Ronald L. Walsworth
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Quantum-limit Chern topological magnetism in TbMn6Sn6
Scanning tunnelling microscopy is used to reveal a new topological kagome magnet with an intrinsic Chern quantum phase, which shows a distinct Landau fan structure with a large Chern gap.
- Jia-Xin Yin
- , Wenlong Ma
- & M. Zahid Hasan
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Coherent many-body exciton in van der Waals antiferromagnet NiPS3
A spin–orbit-entangled exciton state in the van der Waals material NiPS3 is observed, and found to arise from many-body states of a Zhang–Rice singlet.
- Soonmin Kang
- , Kangwon Kim
- & Je-Geun Park
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Superconductivity in metallic twisted bilayer graphene stabilized by WSe2
Placing a single layer of tungsten diselenide in contact with twisted bilayer graphene enables superconductivity even for non-magic twist angles where insulating behavior is absent.
- Harpreet Singh Arora
- , Robert Polski
- & Stevan Nadj-Perge
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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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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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Cascade of electronic transitions in magic-angle twisted bilayer graphene
Electron–electron interactions in magic-angle twisted bilayer graphene can split usually degenerate electronic bands, giving rise to a cascade of electronic transitions revealed by spectroscopy.
- Dillon Wong
- , Kevin P. Nuckolls
- & Ali Yazdani
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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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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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Strongly correlated electrons and hybrid excitons in a moiré heterostructure
Optical spectroscopy is used to probe correlated electronic states in a moiré heterostructure, showing many-body effects such as strong layer paramagnetism and an incompressible Mott-like state of electrons.
- Yuya Shimazaki
- , Ido Schwartz
- & Ataç Imamoğlu
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Imaging the energy gap modulations of the cuprate pair-density-wave state
Using a spectroscopic technique based on scanning tunnelling microscopy, the superconducting energy gap modulations in a copper oxide are visualized, demonstrating that a pair-density-wave state coexists with superconductivity.
- Zengyi Du
- , Hui Li
- & Kazuhiro Fujita
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Observation of the Kondo screening cloud
The existence of the Kondo cloud is revealed by the spatially resolved characterization of the oscillations of the Kondo temperature in a Fabry–Pérot interferometer and its extent is shown to be several micrometres.
- Ivan V. Borzenets
- , Jeongmin Shim
- & Michihisa Yamamoto
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Wafer-scale single-crystal hexagonal boron nitride monolayers on Cu (111)
The epitaxial growth of single-crystal hexagonal boron nitride monolayers on a copper (111) thin film across a sapphire wafer suggests a route to the broad adoption of two-dimensional layered semiconductor materials in industry.
- Tse-An Chen
- , Chih-Piao Chuu
- & Lain-Jong Li
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Strange-metal behaviour in a pure ferromagnetic Kondo lattice
The ferromagnet CeRh6Ge4 is found to exhibit strange-metal behaviour at a quantum critical point, suggesting that changes in the pattern of quantum entanglement, not antiferromagnetism, underlie the development of strange metals.
- Bin Shen
- , Yongjun Zhang
- & Huiqiu Yuan
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Synchrotron infrared spectroscopic evidence of the probable transition to metal hydrogen
The probable transition of hydrogen to its metal state near 425 GPa is observed, with the required high pressures created using a toroidal diamond anvil cell.
- Paul Loubeyre
- , Florent Occelli
- & Paul Dumas
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Classification with a disordered dopant-atom network in silicon
The nonlinearity of hopping conduction in a disordered network of boron dopant atoms in silicon is used to perform nonlinear classification and feature extraction.
- Tao Chen
- , Jeroen van Gelder
- & Wilfred G. van der Wiel
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Synthesis and properties of free-standing monolayer amorphous carbon
The synthesis of surprisingly stable, free-standing single layers of amorphous carbon and their analysis by atomic-resolution imaging could settle a debate about their atomic arrangement and offer unusual electronics applications.
- Chee-Tat Toh
- , Hongji Zhang
- & Barbaros Özyilmaz
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Strain engineering and epitaxial stabilization of halide perovskites
A method of deposition of mixed-cation hybrid perovskite films as lattice-mismatched substrates for an α-FAPbI3 film is described, giving strains of up to 2.4 per cent while also stabilizing the metastable α-FAPbI3 phase for several hundred days.
- Yimu Chen
- , Yusheng Lei
- & Sheng Xu
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Prediction and observation of an antiferromagnetic topological insulator
An intrinsic antiferromagnetic topological insulator, MnBi2Te4, is theoretically predicted and then realized experimentally, with implications for the study of exotic quantum phenomena.
- M. M. Otrokov
- , I. I. Klimovskikh
- & E. V. Chulkov
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A general theoretical and experimental framework for nanoscale electromagnetism
A general framework for incorporating and correcting for nonclassical electromagnetic phenomena in nanoscale systems is presented.
- Yi Yang
- , Di Zhu
- & Marin Soljačić
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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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Carrier-resolved photo-Hall effect
A carrier-resolved photo-Hall technique is developed to extract properties of both majority and minority carriers simultaneously and determine the critical parameters of semiconductor materials under light illumination.
- Oki Gunawan
- , Seong Ryul Pae
- & Byungha Shin
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Axionic charge-density wave in the Weyl semimetal (TaSe4)2I
In the charge-density-wave Weyl semimetal (TaSe4)2I, an axion is observed and identified as a sliding mode in the charge-density-wave phase characterized by anomalous magnetoelectric transport effects.
- J. Gooth
- , B. Bradlyn
- & C. Felser
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Multivalent anions as universal latent electron donors
Multivalent anions are found to be capable of electron-doping polymer semiconductors to realize conductive films with very low work functions, which enable efficient electron injection into materials with low electron affinity.
- Cindy G. Tang
- , Mazlan Nur Syafiqah
- & Peter K. H. Ho
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Electron pairing in the pseudogap state revealed by shot noise in copper oxide junctions
Shot-noise measurements in copper oxides reveal paired charge carriers existing in the pseudogap above the superconducting critical temperature, shedding light on the properties of high-temperature superconductivity in these materials.
- Panpan Zhou
- , Liyang Chen
- & Douglas Natelson
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Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene
Scanning tunnelling spectroscopy and extended-Hubbard-model cluster calculations reveal that magic-angle twisted bilayer graphene is a strongly correlated electron system, similar to other unconventional superconductors.
- Yonglong Xie
- , Biao Lian
- & Ali Yazdani
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Giant thermal Hall conductivity in the pseudogap phase of cuprate superconductors
The so-called pseudogap phase in hole-doped cuprate superconductors is associated with an unusually large thermal Hall effect that attains unprecedented levels as the parent Mott insulator is approached.
- G. Grissonnanche
- , A. Legros
- & L. Taillefer
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Visualizing electrostatic gating effects in two-dimensional heterostructures
Changes in the electronic states of two-dimensional semiconductor devices resulting from electrical gating can be monitored directly using micrometre-scale angle-resolved photoemission spectroscopy.
- Paul V. Nguyen
- , Natalie C. Teutsch
- & Neil R. Wilson
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Machine learning in electronic-quantum-matter imaging experiments
A machine-learning approach is used to train artificial neural networks to analyse experimental scanning tunnelling microscopy image arrays of quantum materials.
- Yi Zhang
- , A. Mesaros
- & Eun-Ah Kim
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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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Lattice anchoring stabilizes solution-processed semiconductors
The stability of both colloidal quantum dots and perovskites can be improved by combining them into a hybrid material in which matched lattice parameters suppress the formation of undesired phases.
- Mengxia Liu
- , Yuelang Chen
- & Edward H. Sargent
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Nanosecond X-ray diffraction of shock-compressed superionic water ice
The atomic structure of H2O is documented at several million atmospheres of pressure and temperatures of several thousand degrees, revealing shockwave-induced ultrafast crystallization and a novel water ice phase, ice XVIII, with exotic superionic properties.
- Marius Millot
- , Federica Coppari
- & Jon H. Eggert
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Subthreshold firing in Mott nanodevices
Mott materials feature scale-less relaxation dynamics after the insulator-to-metal transition that make its electric triggering dependent on recent switching events.
- Javier del Valle
- , Pavel Salev
- & Ivan K. Schuller
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Topological superconductivity in a phase-controlled Josephson junction
Majorana bound states are created in a two-dimensional architecture by confining Majorana channels within a planar Josephson junction, using the phase difference across the junction and an in-plane magnetic field.
- Hechen Ren
- , Falko Pientka
- & Amir Yacoby
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Observation of room-temperature polar skyrmions
Chiral polar-skyrmion bubbles are observed in superlattices of titanium-based perovskite oxides at room temperature.
- S. Das
- , Y. L. Tang
- & R. Ramesh
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Topological chiral crystals with helicoid-arc quantum states
Angle-resolved photoemission spectroscopy measurements reveal that CoSi and RhSi are nearly ideal topological conductors, with structural chirality and surface helicoid arcs of topological charge ±2 arising from bulk multifold chiral states.
- Daniel S. Sanchez
- , Ilya Belopolski
- & M. Zahid Hasan
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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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Comprehensive search for topological materials using symmetry indicators
An algorithm based on symmetry indicators is used to search a crystallographic database and finds thousands of candidate topological materials, which could be exploited in next-generation electronic devices.
- Feng Tang
- , Hoi Chun Po
- & Xiangang Wan
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Catalogue of topological electronic materials
Topological materials are thought to be scarce, but an algorithm that diagnoses nontrivial topology in nonmagnetic materials finds the opposite: more than 30 per cent of the 26,688 materials studied are topological.
- Tiantian Zhang
- , Yi Jiang
- & Chen Fang
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A complete catalogue of high-quality topological materials
Topological quantum chemistry and newly developed codes are used to analyse and compute the topological properties of materials in a large crystal database and to identify new topological phases, finding that more than 27 per cent of all materials in nature are topological.
- M. G. Vergniory
- , L. Elcoro
- & Zhijun Wang
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Mapping orbital changes upon electron transfer with tunnelling microscopy on insulators
Driving single-electron tunnelling in synchronization with the oscillations of the conductive tip of an atomic force microscope allows mapping of the electronic structure of individual molecules in different charge states.
- Laerte L. Patera
- , Fabian Queck
- & Jascha Repp
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Thermodynamic signatures of quantum criticality in cuprate superconductors
Measurements of the specific heat of two cuprate materials at low temperature in magnetic fields large enough to suppress superconductivity and over a wide doping range reveal that the pseudogap phase of cuprates ends at a quantum critical point.
- B. Michon
- , C. Girod
- & T. Klein
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Electrical resistivity across a nematic quantum critical point
The pattern of electrical resistivity in an unconventional superconductor at high magnetic fields and low temperatures across the nematic quantum critical point reveals two classic signatures of quantum criticality.
- S. Licciardello
- , J. Buhot
- & N. E. Hussey
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Unveiling the double-well energy landscape in a ferroelectric layer
A ferroelectric thin film that behaves as a single domain is found to exhibit both negative capacitance and the predicted double-well polarization–energy relationship.
- Michael Hoffmann
- , Franz P. G. Fengler
- & Thomas Mikolajick
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Quantum Hall effect based on Weyl orbits in Cd3As2
Quantized conductivity is observed along a Weyl orbit in wedge-shaped samples of the topological semimetal Cd3As2, providing evidence of the quantum Hall effect in three dimensions.
- Cheng Zhang
- , Yi Zhang
- & Faxian Xiu
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Observation of the nonlinear Hall effect under time-reversal-symmetric conditions
The nonlinear Hall effect is observed in bilayer WTe2 in the absence of a magnetic field, providing a direct measure of the dipole moment of the Berry curvature.
- Qiong Ma
- , Su-Yang Xu
- & Pablo Jarillo-Herrero
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Three-dimensional collective charge excitations in electron-doped copper oxide superconductors
Resonant inelastic X-ray scattering on electron-doped copper oxide superconductors reveals a three-dimensional charge collective mode, which has properties suggestive of the long-sought acoustic plasmon.
- M. Hepting
- , L. Chaix
- & W. S. Lee
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Gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2
Monolayers of Fe3GeTe2 exhibit itinerant ferromagnetism with an out-of-plane magnetocrystalline anisotropy; ionic gating raises the ferromagnetic transition temperature of few-layer Fe3GeTe2 to room temperature.
- Yujun Deng
- , Yijun Yu
- & Yuanbo Zhang
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Electronic noise due to temperature differences in atomic-scale junctions
A fundamental electronic noise—beyond electronic thermal noise and voltage-activated shot noise—that is generated by temperature differences across nanoscale conductors is demonstrated, with possible implications for thermometry and electronics.
- Ofir Shein Lumbroso
- , Lena Simine
- & Oren Tal
Quantum distance and anomalous Landau levels of flat bands