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| Open AccessRealization of large-area ultraflat chiral blue phosphorene
Blue phosphorene (BlueP) is a 2D phosphorus allotrope predicted to host Dirac fermions and other interesting electronic properties. Here, the authors report the growth of large-area BlueP films with ordered chiral nanostructures on Cu(111) substrates, expanding the range of its potential applications.
- Ye-Heng Song
- , M. U. Muzaffar
- & Zhenyu Zhang
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Article
| Open AccessDeceptive orbital confinement at edges and pores of carbon-based 1D and 2D nanoarchitectures
The apparent electronic confinement at nanographene boundaries in scanning tunneling microscopy/spectroscopy is often misinterpreted. Here, the authors explain this phenomenon in terms of the decay of frontier orbitals and confinement at the edges of graphene nanoribbons and pores in nanoporous graphene.
- Ignacio Piquero-Zulaica
- , Eduardo Corral-Rascón
- & Johannes V. Barth
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Article
| Open AccessCharge-density wave mediated quasi-one-dimensional Kondo lattice in stripe-phase monolayer 1T-NbSe2
The realization of heavy-fermion physics in van der Waals materials with d-electrons has attracted attention recently. Here the authors present evidence for a quasi-1D Kondo lattice in monolayer NbSe2, driven into a stripe phase by Se-deficient line defects created during growth.
- Zhen-Yu Liu
- , Heng Jin
- & Ying-Shuang Fu
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Article
| Open AccessDual Higgs modes entangled into a soliton lattice in CuTe
The Higgs mode in condensed matter physics refers to the oscillations of the amplitude of the order parameter, and single Higgs modes have been studies in various systems. Here the authors report real-space observation of two coupled Higgs modes in a 1D charge density wave phase of CuTe.
- SeongJin Kwon
- , Hyunjin Jung
- & Han Woong Yeom
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Article
| Open AccessHigh-throughput computational stacking reveals emergent properties in natural van der Waals bilayers
2D bilayers have recently attracted significant attention due to fundamental properties like interlayer excitons and interfacial ferroelectricity. Here, the authors report a density functional theory approach to identify 2586 stable homobilayer systems and calculate their stacking-dependent electronic, magnetic and vibrational properties.
- Sahar Pakdel
- , Asbjørn Rasmussen
- & Kristian S. Thygesen
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Article
| Open AccessElectrically induced cancellation and inversion of piezoelectricity in ferroelectric Hf0.5Zr0.5O2
Hf0.5Zr0.5O2 ferroelectric capacitors undergo a continuous transition from a positive effective to a fully inverted negative piezoelectric coefficient d33 upon electrical cycling. With proper ac training, both the net effective and the local piezoresponses can be nullified while the polarization is kept fully switchable.
- Haidong Lu
- , Dong-Jik Kim
- & Catherine Dubourdieu
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Article
| Open AccessSupercurrent mediated by helical edge modes in bilayer graphene
P. Rout et al. study Josephson junctions where the weak link is WSe2-encapsulated bilayer graphene, which features helical edge modes. They argue that the supercurrent channels along opposite edges of the weak link are coupled by a circulating helical mode.
- Prasanna Rout
- , Nikos Papadopoulos
- & Srijit Goswami
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Article
| Open AccessTwo-component nematic superconductivity in 4Hb-TaS2
I. Silber et al. discover a two-fold symmetry of the superconducting upper critical field in hexagonal 4Hb-TaS2 just below Tc, a clear signature of nematic, two-component superconductivity. They further suggest a theoretical model that reconciles the nematic superconductivity with the previously-observed time-reversal-symmetry-breaking in this material.
- I. Silber
- , S. Mathimalar
- & Y. Dagan
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Article
| Open AccessUltrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction
Photoinduced phase transitions occur in a variety of materials and allow for the optical control of the materials properties. Here, Herve et al present a streaming powder X-ray diffraction method allowing them to study the ultrafast photoinduced phase transition of Rb0.94Mn0.94Co0.06[Fe(CN)6]0.9 within thermal hysteresis.
- Marius Hervé
- , Gaël Privault
- & Eric Collet
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Article
| Open AccessTowards near-term quantum simulation of materials
The use of NISQ devices for useful quantum simulations of materials and chemistry is still mainly limited by the necessary circuit depth. Here, the authors propose to combine classically-generated effective Hamiltonians, hybrid fermion-to-qubit mapping and circuit optimisations to bring this requirement closer to experimental feasibility.
- Laura Clinton
- , Toby Cubitt
- & Evan Sheridan
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Article
| Open AccessGiant tunnelling electroresistance in atomic-scale ferroelectric tunnel junctions
The authors report ferroelectric tunnel junctions based on samarium-substituted layered bismuth oxide, which show tunnelling electroresistance of 7 × 105 and high endurance over 5 billion cycles, even when the film is down to one nanometer.
- Yueyang Jia
- , Qianqian Yang
- & Rui Yang
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Article
| Open AccessUnraveling the crucial role of trace oxygen in organic semiconductors
Conventional deoxygenation methods typically result in inevitable trace oxygen residue in organic semiconductors. Here, Huang et al. reports a non-destructive soft-plasma treatment for deoxygenation and that removal of trace oxygen can be used to modulate p-type characteristics.
- Yinan Huang
- , Kunjie Wu
- & Wenping Hu
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Article
| Open AccessSpin-resolved topology and partial axion angles in three-dimensional insulators
3D higher-order topological insulators (HOTIs) exhibit 1D hinge states depending on extrinsic sample details, while intrinsic features of HOTIs remain unknown. Here, K.S. Lin et al. introduce the framework of spin-resolved topology to show that helical HOTIs can realize a doubled axion insulator phase with nontrivial partial axion angles.
- Kuan-Sen Lin
- , Giandomenico Palumbo
- & Barry Bradlyn
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Article
| Open AccessField-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T
SrCu2(BO3)2 realizes the Shastry-Sutherland model (SSM), a 2D frustrated dimer model. Here, via high-magnetic-field inelastic neutron scattering measurements and matrix-product-state calculations, Fogh et al. find evidence for Bose-Einstein condensation of S = 2 two-triplon bound states, which is a spin-nematic phase.
- Ellen Fogh
- , Mithilesh Nayak
- & Henrik M. Rønnow
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Article
| Open AccessElectrically and mechanically driven rotation of polar spirals in a relaxor ferroelectric polymer
Polar spirals induced in a relaxor ferroelectric can be quasi-continuously rotated by applying electric/mechanical fields, due to an asymmetric Coulomb interaction. The rotations are non-volatile with robust retention, and can be optically read out.
- Mengfan Guo
- , Erxiang Xu
- & Yang Shen
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Article
| Open AccessQuasi-2D Fermi surface in the anomalous superconductor UTe2
A. G. Eaton et al. directly probe the Fermi surface of the candidate triplet superconductor UTe2 by measuring magnetic quantum oscillations in ultra-pure crystals. By comparison with model calculations, the data are found to be consistent with a Fermi surface that consists of two cylindrical sections of electron and hole-type respectively.
- A. G. Eaton
- , T. I. Weinberger
- & M. Vališka
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Article
| Open AccessFractional quantum ferroelectricity
A concept of fractional quantum ferroelectricity is proposed, where the direction of ferroelectric polarization difference no longer subjects to the symmetry restrictions of Neumann’s principle. It indicates that ferroelectricity can exist in nonpolar systems, which may lead to discovery of many overlooked ferroelectrics.
- Junyi Ji
- , Guoliang Yu
- & H. J. Xiang
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Article
| Open AccessOrbital perspective on high-harmonic generation from solids
Here the authors identify real-space contributions to the characteristics of high-harmonic generation in ReS2 and demonstrate the possibility of laser-controlled emission. They find that the spectrum is not just determined by the band structure, but also by the interference between HHG signals coming from different atoms within the unit cell.
- Álvaro Jiménez-Galán
- , Chandler Bossaer
- & Giulio Vampa
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| Open AccessA coherent phonon-induced hidden quadrupolar ordered state in Ca2RuO4
Ultrafast laser excitation can generate metastable states in quantum materials, with no counterpart in equilibrium. Here the authors demonstrate a transient quadrupolar ordered state in Ca2RuO4 single crystals via excitation of a phonon mode coupled to the order parameter.
- Honglie Ning
- , Omar Mehio
- & David Hsieh
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Article
| Open AccessLarge scale purification in semiconductors using Rydberg excitons
Charged impurities are a major source of charge noise in semiconductors. Here, using pump-probe time-resolved relative transmission measurements on cuprous oxide, the authors demonstrate a strategy for mitigating charged impurities by injection and subsequent breakdown of Rydberg excitons.
- Martin Bergen
- , Valentin Walther
- & Marc Aßmann
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Article
| Open AccessA microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn3
Kondo materials exhibit extremely rich physics, from unconventional superconductivity to topological phases. Unfortunately, for a real material, direct solution of the Kondo lattice is practically impossible. Here, Simeth et al. present a tractable approach to this problem, showing how a multi-orbital periodic Anderson model can be reduced to a Kondo lattice model, and be applied to relevant materials and quantitatively validated with neutron spectroscopy.
- W. Simeth
- , Z. Wang
- & M. Janoschek
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Article
| Open AccessEmergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic metal
The anomalous Hall effect is typically associated with ferromagnets and referred to as anomalous due to its persistence even after the applied magnetic field is removed, due to the net magnetization of the ferromagnet. Recently there has been much interest in antiferromagnets that can host an anomalous Hall effect, despite a vanishing magnetization, and here, Wang et al observe an anomalous Hall effect in collinearly antiferromagnetic chromium doped RuO2.
- Meng Wang
- , Katsuhiro Tanaka
- & Fumitaka Kagawa
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Article
| Open AccessManipulation of fractionalized charge in the metastable topologically entangled state of a doped Wigner crystal
The metastable state with a complex domain structure in 1T-TaS2 has been intensively studied. Using a multi-tip scanning tunnelling microscope, Mraz et al. reveal the microscopic dynamics of the current-pulse-induced metastable state and interpret it in terms of transport in a doped Wigner crystal lattice.
- Anze Mraz
- , Michele Diego
- & Dragan Mihailovic
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Article
| Open AccessQuadrupole anomalous Hall effect in magnetically induced electron nematic state
The anomalous Hall effect in materials with complex magnetic structures has attracted significant research attention. Here the authors report anisotropic anomalous Hall effect in epitaxial NiCo2O4 films attributed to an extended toroidal quadrupole conical magnetic order.
- Hiroki Koizumi
- , Yuichi Yamasaki
- & Hideto Yanagihara
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Article
| Open AccessTopological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4
W. X. Zhao et al. study the higher-order topological insulator candidate Bi4Br4 by angle-resolved photoemission spectroscopy (ARPES) and ab-initio calculation. They provide strong evidence for the higher-order topological insulator phase, including a signature of the hinge states inside the (100) surface gap.
- Wenxuan Zhao
- , Ming Yang
- & Lexian Yang
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Article
| Open AccessDichotomy of heavy and light pairs of holes in the t−J model
The microscopic mechanism of superconducting pairing in hole-doped cuprates is still debated. Here, using state-of-the-art numerical techniques, the authors examine the properties of pairs of holes in a model relevant to cuprates revealing two types of bound states involving light and heavy hole pairs.
- A. Bohrdt
- , E. Demler
- & F. Grusdt
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Article
| Open AccessGate-tunable anomalous Hall effect in Bernal tetralayer graphene
Intrinsic anomalous Hall effect has been observed in twisted graphene multilayers, but these structures are typically not energetically favorable. This study extends these observations to Bernal-stacked tetralayer graphene, which is the most stable configuration of four-layer graphene.
- Hao Chen
- , Arpit Arora
- & Kian Ping Loh
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Article
| Open AccessTwo-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2
Examples of 2D heavy-fermion materials are rare, and the details of their electronic structure have remained elusive. Here, Nakamura et al. report the synthesis and angle-resolved photoemission spectroscopy measurements of a monolayer Kondo lattice, YbCu2, on a Cu(111) surface with an estimated coherence temperature of 30 K.
- Takuto Nakamura
- , Hiroki Sugihara
- & Shin-ichi Kimura
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Article
| Open AccessCharge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals
Unconventional charge order with chiral response to a magnetic field was observed in kagome metals like KV3Sb5, but the mechanism is not fully understood. Tazai et al. develop a theory based on the bond order fluctuation mechanism and provide a unified view of quantum phases in this material family.
- Rina Tazai
- , Youichi Yamakawa
- & Hiroshi Kontani
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Article
| Open AccessHidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6
Recently, time-reversal symmetry-breaking charge order was demonstrated in the AV3Sb5 (A = K, Rb, Cs) family of kagome superconductors. Here the authors extend this observation to the recently discovered kagome material ScV6Sn6 and discuss differences and similarities to other charge-ordered kagome lattices.
- Z. Guguchia
- , D. J. Gawryluk
- & H. Luetkens
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Article
| Open AccessCompeting charge-density wave instabilities in the kagome metal ScV6Sn6
A charge-density wave state was recently reported in the bilayer kagome metal ScV6Sn6, but its nature is debated. Here, using inelastic X-ray scattering, the authors observe two competing charge-density waves and find the ground state is promoted by a momentum-dependent electron-phonon interaction.
- Saizheng Cao
- , Chenchao Xu
- & Yu Song
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Article
| Open AccessElectron pairing and nematicity in LaAlO3/SrTiO3 nanostructures
SrTiO3-based heterostructures display intriguing low-temperature transport features. Here the authors study LaAlO3/SrTiO3 nanoscale crossbar devices, revealing correlations between electron pairing without superconductivity, anomalous Hall effect, and electronic nematicity, suggesting a shared microscopic origin.
- Aditi Nethwewala
- , Hyungwoo Lee
- & Jeremy Levy
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Article
| Open AccessA robust and tunable Luttinger liquid in correlated edge of transition-metal second-order topological insulator Ta2Pd3Te5
The interplay of electronic correlations and topology has been a forefront topic in condensed matter physics. Wang et al. present evidence of a correlated topological edge state supporting the Luttinger liquid behaviour in the candidate quadrupole topological insulator Ta2Pd3Te5.
- Anqi Wang
- , Yupeng Li
- & Jie Shen
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Article
| Open AccessMott insulators with boundary zeros
Topological classification of interacting electronic states has emerged as an important topic recently. Wagner at al. show that the momentum structure of the zeros of the electron Green’s function can be used to identify a topological Mott insulator phase, similarly to the single-particle dispersion.
- N. Wagner
- , L. Crippa
- & G. Sangiovanni
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Article
| Open AccessAnomalous excitonic phase diagram in band-gap-tuned Ta2Ni(Se,S)5
The presence of excitonic instability and its relationship with a structural transition in Ta2NiSe5 has been debated. Chen et al. map out the electronic bands and lattice distortion across the semimetal-to-semiconductor transition with sulfur doping, revealing the crucial role of electron-phonon coupling.
- Cheng Chen
- , Weichen Tang
- & Yu He
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Article
| Open AccessAntiferromagnetic topological insulator with selectively gapped Dirac cones
Antiferromagnetic topological materials have attracted attention recently due to their unique quantum properties and application potential. Here the authors establish an antiferromagnetic topological insulator in NdBi and demonstrate gapped and gapless surface states in two different magnetic domains.
- A. Honma
- , D. Takane
- & T. Sato
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Article
| Open AccessEnhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
Strong optical excitation near band extrema can drive novel correlated states. Here the authors report a non-equilibrium many-body state in graphite driven by a strong excitation near van Hove singularity, yielding a tenfold increase in optical conductivity attributed to carrier excitations in the flat bands.
- T. P. H. Sidiropoulos
- , N. Di Palo
- & J. Biegert
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Article
| Open AccessUnraveling the optoelectronic properties of CoSbx intrinsic selective solar absorber towards high-temperature surfaces
The efficiency of CoSbx (where 2 < x < 3) as a selective solar absorber is investigated. Here, authors demonstrate that CoSbx endows broadband solar absorption (0.96) and simultaneous low emissivity (0.18), making it a promising material for use in solar energy systems.
- Anastasiia Taranova
- , Kamran Akbar
- & Alberto Vomiero
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Article
| Open AccessPrecursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2
The authors study the charge-density-wave (CDW) compound 2H-TaSe2 by inelastic x-ray scattering combined with photoemission spectroscopy. They find evidence for a precursor region above the CDW transition temperature, which is characterized by an overdamped phonon mode and is not detectable by photoemission.
- Xingchen Shen
- , Rolf Heid
- & Frank Weber
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Article
| Open AccessObserving the universal screening of a Kondo impurity
Previous work on charge Kondo circuits, in which a spin is formed by two degenerate charge states of a metallic island, has been limited to transport measurements of multi-channel Kondo problems. Piquard et al. use thermodynamic measurements via a charge sensor to study the evolution of a single Kondo impurity.
- C. Piquard
- , P. Glidic
- & F. Pierre
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Article
| Open AccessEmergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal
A Weyl semimetal formally requires either broken time reversal symmetry or inversion symmetry. One class of Weyl semimetals-the crystal family of NdAlSi-exhibits both. Here, Li et al perform angle-resolved photoemission spectroscopy measurements on NdAlSi, and observe the formation of an additional Weyl fermion as the material becomes ferrimagnetic.
- Cong Li
- , Jianfeng Zhang
- & Oscar Tjernberg
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Article
| Open AccessUnveiling the double-peak structure of quantum oscillations in the specific heat
Quantum oscillations serve as an important probe of electronic structure of quantum materials. Yang et al. study quantum oscillations in the electronic specific heat of natural graphite, unveiling a double-peak structure absent in commonly used theory, and show its utility in determining the Landé g-factors.
- Zhuo Yang
- , Benoît Fauqué
- & Yoshimitsu Kohama
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Article
| Open AccessHigh-speed mapping of surface charge dynamics using sparse scanning Kelvin probe force microscopy
Dynamic mapping of charge motion across multiple length- and timescales is essential for understanding a variety of phenomena. Here, the authors introduce sparse scanning KPFM, which enables fast nanoscale charge mapping at 3 frames per second to track ion migration.
- Marti Checa
- , Addis S. Fuhr
- & Liam Collins
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Article
| Open AccessAn artificially-intelligent cornea with tactile sensation enables sensory expansion and interaction
Existing artificial corneas can assume partial functions of the human cornea, but sense reconstruction remains a challenge. Qu et al. develop an artificially-intelligent cornea with tactile sensation that enables sensory expansion and interaction.
- Shangda Qu
- , Lin Sun
- & Wentao Xu
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Article
| Open AccessInterface-type tunable oxygen ion dynamics for physical reservoir computing
Physical reservoirs that contain intrinsic nonlinear dynamic processes could serve as next-generation dynamic computing systems. Here, Liu et al. introduced an interface-type transistor based on oxygen ion dynamics to perform reservoir computing.
- Zhuohui Liu
- , Qinghua Zhang
- & Chen Ge
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Article
| Open AccessDirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
The authors study (Bi,Sb)2Te3/FeTe bilayers, which feature emergent superconductivity at the interface with Tc ~ 12 K. Through angle-resolved photoemission spectroscopy and electrical transport measurements, they argue that the Dirac-fermion-mediated Ruderman-Kittel-Kasuya-Yosida-type interaction weakens antiferromagnetic order in FeTe layer, allowing for superconductivity.
- Hemian Yi
- , Lun-Hui Hu
- & Cui-Zu Chang
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Article
| Open AccessNodal band-off-diagonal superconductivity in twisted graphene superlattices
The authors theoretically study superconductivity in twisted-bilayer and twisted-trilayer graphene, finding that flavor polarization allows for Cooper pairing in which the pairs consist of electrons in different bands. Both intervalley phonons and fluctuations of a time-reversal-symmetric intervalley coherent order can favor such pairing.
- Maine Christos
- , Subir Sachdev
- & Mathias S. Scheurer
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Article
| Open AccessQuantitative assessment of the universal thermopower in the Hubbard model
High-temperature behaviour of thermopower is special in cuprates, allowing for theory-experiment comparisons. Wang et al. use quantum Monte Carlo to compute high temperature thermopower in the Hubbard model, demonstrating qualitative and quantitative agreement with experiments across multiple cuprate families.
- Wen O. Wang
- , Jixun K. Ding
- & Thomas P. Devereaux
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Article
| Open AccessObservation of an exotic insulator to insulator transition upon electron doping the Mott insulator CeMnAsO
Doping a Mott insulator can lead to novel electronic states. Wildman et al. observe a novel quantum insulating state in electron-doped Mott insulator CeMnAsO and propose a tentative interpretation in terms of many-body localization, which has not been observed in a solid-state material.
- E. J. Wildman
- , G. B. Lawrence
- & A. C. Mclaughlin