Featured
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Atomically engineered interfaces yield extraordinary electrostriction
A system consisting of alternating thin films of two dielectrics is used to produce greatly enhanced electrostriction derived from coherent strain imparted by interfacial lattice discontinuity.
- Haiwu Zhang
- , Nini Pryds
- & Vincenzo Esposito
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| Open AccessTunable quantum criticalities in an isospin extended Hubbard model simulator
Using an experimental simulator of the extended Hubbard model with spin–valley isospins arising in chiral-stacked twisted double bilayer graphene, the presence of highly tunable quantum criticalities is demonstrated.
- Qiao Li
- , Bin Cheng
- & Feng Miao
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A solution-processed n-type conducting polymer with ultrahigh conductivity
A reaction is described combining oxidative polymerization and in situ reductive n-doping to yield poly(benzodifurandione), a facilely synthesized stable n-type conducting polymer with ultrahigh conductivity, with applications in organic electronics.
- Haoran Tang
- , Yuanying Liang
- & Fei Huang
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Intralayer charge-transfer moiré excitons in van der Waals superlattices
By combining large-scale first-principles GW-BSE calculations and micro-reflection spectroscopy, the nature of the exciton resonances in WSe2/WS2 moiré superlattices is identified, highlighting non-trivial exciton states and suggesting new ways of tuning many-body physics.
- Mit H. Naik
- , Emma C. Regan
- & Steven G. Louie
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Formation of moiré interlayer excitons in space and time
Multidimensional time- and angle-resolved photoelectron spectroscopy is used to determine the interlayer exciton formation process, reveal a direct hallmark of the superlattice moiré modification, and reconstruct the real-space wavefunction distribution.
- David Schmitt
- , Jan Philipp Bange
- & Stefan Mathias
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P-type electrical contacts for 2D transition-metal dichalcogenides
Clean van der Waals contacts of high-work-function metals have been demonstrated on few- and single-layered MoS2 and WSe2, leading to p-type characteristics on single-layer MoS2 and purely p-type characteristics on WSe2.
- Yan Wang
- , Jong Chan Kim
- & Manish Chhowalla
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Magnetic memory and spontaneous vortices in a van der Waals superconductor
An alternating stack of a candidate spin liquid and a superconductor shows a spontaneous vortex phase in the superconducting state without magnetism in the normal state. This indicates the presence of unconventional magnetic ordering independent of the superconductor.
- Eylon Persky
- , Anders V. Bjørlig
- & Beena Kalisky
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Direct observation of vortices in an electron fluid
Vortices in an electron fluid are directly observed in a para-hydrodynamic regime in which the spatial diffusion of electron momenta is enabled by small-angle scattering rather than electron–electron scattering.
- A. Aharon-Steinberg
- , T. Völkl
- & E. Zeldov
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Evidence for unconventional superconductivity in twisted trilayer graphene
High-resolution scanning tunnelling microscopy and spectroscopy are used to provide evidence for unconventional superconductivity in magic-angle twisted trilayer graphene.
- Hyunjin Kim
- , Youngjoon Choi
- & Stevan Nadj-Perge
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High-κ perovskite membranes as insulators for two-dimensional transistors
Single-crystalline perovskite membranes with an ultrahigh dielectric constant show potential as a gate dielectric for two-dimensional field-effect transistors.
- Jing-Kai Huang
- , Yi Wan
- & Sean Li
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Observation of a linked-loop quantum state in a topological magnet
A study combining spectroscopy and mathematical topology reports the observation of linked node loops in a quantum magnet, with properties suggesting a Seifert bulk–boundary correspondence.
- Ilya Belopolski
- , Guoqing Chang
- & M. Zahid Hasan
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Ultrathin ferroic HfO2–ZrO2 superlattice gate stack for advanced transistors
In the standard Si transistor gate stack, replacing conventional dielectric HfO2 with an ultrathin ferroelectric–antiferroelectric HfO2–ZrO2 heterostructure exhibiting the negative capacitance effect demonstrates ultrahigh capacitance without degradation in leakage and mobility, promising for ferroelectric integration into advanced logic technology.
- Suraj S. Cheema
- , Nirmaan Shanker
- & Sayeef Salahuddin
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Catalogue of flat-band stoichiometric materials
A catalogue of the naturally occurring three-dimensional stoichiometric materials with flat bands around the Fermi level provides a powerful search engine for future theoretical and experimental studies.
- Nicolas Regnault
- , Yuanfeng Xu
- & B. Andrei Bernevig
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Steady Floquet–Andreev states in graphene Josephson junctions
Using continuous microwave application without substantial heating, Floquet–Andreev states in graphene Josephson junctions are realized, and their energy spectra are measured directly by superconducting tunnelling spectroscopy.
- Sein Park
- , Wonjun Lee
- & Gil-Ho Lee
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Scaling of the strange-metal scattering in unconventional superconductors
Precise quantitative scaling laws are observed between the normalized T-linear coefficient and Tc among copper oxides, pnictides and a class of organic superconductors, suggesting a common underlying physics at work in these unconventional superconductors.
- Jie Yuan
- , Qihong Chen
- & Zhongxian Zhao
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Charge-density-wave-driven electronic nematicity in a kagome superconductor
Charge-density-wave-driven electronic nematicity that occurs well below the charge-density-wave transition temperature is reported in the kagome superconductor CsV3Sb5.
- Linpeng Nie
- , Kuanglv Sun
- & Xianhui Chen
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Review Article |
Reproducibility in the fabrication and physics of moiré materials
The essential properties of moiré materials and the progress and latest developments in the field are reviewed, and their fabrication and physics are discussed from a reproducibility perspective.
- Chun Ning Lau
- , Marc W. Bockrath
- & Fan Zhang
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| Open AccessFractional Chern insulators in magic-angle twisted bilayer graphene
A study using local compressibility measurements reports fractional Chern insulator states at low magnetic field in magic-angle twisted bilayer graphene, and establishes the applied magnetic field as a means to tune the Berry curvature distribution.
- Yonglong Xie
- , Andrew T. Pierce
- & Amir Yacoby
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Giant modulation of optical nonlinearity by Floquet engineering
Coherent control and giant modulation of optical nonlinearity in a van der Waals layered magnetic insulator is demonstrated using Floquet engineering.
- Jun-Yi Shan
- , M. Ye
- & D. Hsieh
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Artificial heavy fermions in a van der Waals heterostructure
A study demonstrates the synthesis and characterization of a two-dimensional van der Waals heterostructure hosting artificial heavy fermions, providing a tunable platform for investigations of heavy-fermion physics.
- Viliam Vaňo
- , Mohammad Amini
- & Peter Liljeroth
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Colossal angular magnetoresistance in ferrimagnetic nodal-line semiconductors
A study reports a colossal angular magnetoresistance in the topological magnet Mn3Si2Te6, resulting from a metal-to-insulator transition caused by controlled lifting of a topological band degeneracy, and discusses the key parameters involved.
- Junho Seo
- , Chandan De
- & Jun Sung Kim
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Review Article |
Excitons and emergent quantum phenomena in stacked 2D semiconductors
This Review discusses the exciton physics of transition metal dichalcogenides, focusing on moiré patterns and exciton many-body physics, and outlines future research directions in the field.
- Nathan P. Wilson
- , Wang Yao
- & Xiaodong Xu
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Reconstruction of Bloch wavefunctions of holes in a semiconductor
Bloch wavefunctions of two types of hole in gallium arsenide are reconstructed by measuring the polarization of light emitted by collisions of electrons and holes accelerated by a terahertz laser.
- J. B. Costello
- , S. D. O’Hara
- & M. S. Sherwin
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Signatures of bosonic Landau levels in a finite-momentum superconductor
Using torque magnetometry, the thermodynamic signatures of bosonic Landau level transitions are observed in a layered superconductor, owing to the formation of Cooper pairs with finite momentum.
- A. Devarakonda
- , T. Suzuki
- & J. G. Checkelsky
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Evidence for unconventional superconductivity in twisted bilayer graphene
A study combining tunnelling and Andreev reflection spectroscopy with a scanning tunnelling microscope provides evidence for unconventional superconductivity in magic-angle twisted bilayer graphene.
- Myungchul Oh
- , Kevin P. Nuckolls
- & Ali Yazdani
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Cascade of correlated electron states in the kagome superconductor CsV3Sb5
A study reveals a temperature-dependent cascade of different symmetry-broken electronic states in the kagome superconductor CsV3Sb5, and highlights intriguing parallels between vanadium-based kagome metals and materials exhibiting similar electronic phases.
- He Zhao
- , Hong Li
- & Ilija Zeljkovic
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Imaging two-dimensional generalized Wigner crystals
So far, only indirect evidence of Wigner crystals has been reported, but a specially designed scanning tunnelling microscope is used here to directly image them in a moiré heterostructure.
- Hongyuan Li
- , Shaowei Li
- & Feng Wang
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Matters Arising |
Unusual width of the superconducting transition in a hydride
- J. E. Hirsch
- & F. Marsiglio
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Pseudogap in a crystalline insulator doped by disordered metals
A back-bending band structure and an emerging pseudogap are observed at the interface between a crystalline solid (black phosphorus) and disordered alkali-metal dopants.
- Sae Hee Ryu
- , Minjae Huh
- & Keun Su Kim
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Linear-in temperature resistivity from an isotropic Planckian scattering rate
Angle-dependent magnetoresistance measurements of a strange-metal phase of a hole-doped cuprate show a well defined Fermi surface and an isotropic linear-in-temperature scattering rate that saturates at the Planckian limit.
- Gaël Grissonnanche
- , Yawen Fang
- & B. J. Ramshaw
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Incoherent transport across the strange-metal regime of overdoped cuprates
Measurements of high-field magnetotransport in overdoped cuprates indicate that the strange-metal regime exists beyond the critical doping, and that it has both coherent and incoherent contributions.
- J. Ayres
- , M. Berben
- & N. E. Hussey
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Signatures of Wigner crystal of electrons in a monolayer semiconductor
The signature of a Wigner crystal—the analogue of a solid phase for electrons—is observed via the optical reflection spectrum in a monolayer transition metal dichalcogenide.
- Tomasz Smoleński
- , Pavel E. Dolgirev
- & Ataç Imamoğlu
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Bilayer Wigner crystals in a transition metal dichalcogenide heterostructure
Optical signatures reveal correlated insulating Wigner crystals—electron solids—in a bilayer of a two-dimensional transition metal dichalcogenide, MoSe2, with hexagonal boron nitride between the layers.
- You Zhou
- , Jiho Sung
- & Hongkun Park
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Article
| Open AccessSymmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet
Measurements on a chiral magnet show that non-symmorphic symmetries enforce topological crossings exactly at the Fermi level in certain materials; these crossings can be controlled by an applied magnetic field.
- Marc A. Wilde
- , Matthias Dodenhöft
- & Christian Pfleiderer
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Tomographic reconstruction of oxygen orbitals in lithium-rich battery materials
High-energy X-ray Compton measurements and first-principles modelling reveal how the electronic orbital responsible for the reversible anionic redox activity can be imaged and visualized, and its character and symmetry determined.
- Hasnain Hafiz
- , Kosuke Suzuki
- & Venkatasubramanian Viswanathan
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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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Rashba valleys and quantum Hall states in few-layer black arsenic
Two-dimensional electronic systems in few-layer black arsenic show gate-tunable Rashba bands with unique spin–valley flavours and unconventional quantum Hall states due to synergetic spin–orbit coupling and the Stark effect.
- Feng Sheng
- , Chenqiang Hua
- & Yi Zheng
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Entropic evidence for a Pomeranchuk effect in magic-angle graphene
Magic-angle graphene is found to have an exotic phase transition where, on heating, entropy is transferred from motional to magnetic degrees of freedom, analogously to the Pomeranchuk effect in 3He.
- Asaf Rozen
- , Jeong Min Park
- & Shahal Ilani
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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 |
On the measured dielectric constant of amorphous boron nitride
- Lei Li
- & Xiang Ming Chen
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Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene
Highly tunable moiré superconductivity is observed in magic-angle twisted trilayer graphene, and observations suggest that this superconductor can be tuned close to the crossover to a two-dimensional Bose–Einstein condensate.
- Jeong Min Park
- , Yuan Cao
- & Pablo Jarillo-Herrero
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Correlation-driven topological phases in magic-angle twisted bilayer graphene
Correlation-driven topological phases with different Chern numbers are observed in magic-angle twisted bilayer graphene in modest magnetic fields, indicating that strong electronic interactions can lead to topologically non-trivial phases.
- Youngjoon Choi
- , Hyunjin Kim
- & Stevan Nadj-Perge
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Landau quantization and highly mobile fermions in an insulator
Pronounced quantum oscillations in magnetoresistance, a phenomenon that was only expected in metals with highly mobile carriers, are observed in the strongly insulating state of two-dimensional WTe2.
- Pengjie Wang
- , Guo Yu
- & Sanfeng Wu
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Strongly correlated Chern insulators in magic-angle twisted bilayer graphene
Strong electron–electron interactions in magic-angle twisted bilayer graphene can fundamentally change the topology of the system’s flat bands, producing a hierarchy of strongly correlated topological insulators in modest magnetic fields.
- Kevin P. Nuckolls
- , Myungchul Oh
- & Ali Yazdani
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Unconventional ferroelectricity in moiré heterostructures
Electronic ferroelectricity is observed in a graphene-based moiré heterostructure, which is explained using a spontaneous interlayer charge-transfer model driven by layer-specific on-site Coulomb repulsion.
- Zhiren Zheng
- , Qiong Ma
- & Pablo Jarillo-Herrero
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High-throughput calculations of magnetic topological materials
High-throughput calculations are performed to predict approximately 130 magnetic topological materials, with complete electronic structure calculations and topological phase diagrams.
- Yuanfeng Xu
- , Luis Elcoro
- & B. Andrei Bernevig
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Third-order nanocircuit elements for neuromorphic engineering
Electrophysical processes are used to create third-order nanoscale circuit elements, and these are used to realize a transistorless network that can perform Boolean operations and find solutions to a computationally hard graph-partitioning problem.
- Suhas Kumar
- , R. Stanley Williams
- & Ziwen Wang
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Piezoelectric and pyroelectric effects induced by interface polar symmetry
A built-in electric field at the interface of metals and centrosymmetric semiconductors is shown to induce polar structures in the semiconductors and generate substantial piezoelectric and pyroelectric effects.
- Ming-Min Yang
- , Zheng-Dong Luo
- & Marin Alexe
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Electronic phase separation in multilayer rhombohedral graphite
High-quality rhombohedral graphite films are found to offer an alternative to twisted bilayer graphene as a platform for studying correlated physics in carbon materials.
- Yanmeng Shi
- , Shuigang Xu
- & Artem Mishchenko