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| Open AccessAntiferromagnetic magnonic charge current generation via ultrafast optical excitation
Néel spin-orbit torques arise due to charge currents in some antiferromagnets, and have sparked interest as a possible pathway for achieving electrical control of antiferromagnetic order. While the driving of antiferromagnetic order by Néel spin-orbit torques is now experimentally well established, the inverse process, where magnetic excitations in an antiferromagnetic drive a charge current is not reported. Here Huang, Liao, Qiu, and coauthors observe this inverse process in an Mn2Au thin film.
- Lin Huang
- , Liyang Liao
- & Cheng Song
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Article
| Open AccessExtreme magnetoresistance at high-mobility oxide heterointerfaces with dynamic defect tunability
Extreme magnetoresistance is characterized by a large and non-saturating magnetoresistance. Typically, it is observed in materials with compensated bandstructures, however, here, Christensen et al demonstrate a large and non-saturating magnetoresistance in a γAl2O3/SrTiO3 heterostructure, which is related to disorder, rather than the materials bandstructure.
- D. V. Christensen
- , T. S. Steegemans
- & N. Pryds
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Article
| Open AccessTunable exciton valley-pseudospin orders in moiré superlattices
Control of correlated excitonic states is a key goal of modern optoelectronic physics. Here, the authors demonstrate filling- and field-tunable exciton valley-pseudospin orders in a moiré heterostructure.
- Richen Xiong
- , Samuel L. Brantly
- & Chenhao Jin
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Article
| Open AccessPolarization-driven band topology evolution in twisted MoTe2 and WSe2
The band topology of twisted 2D systems is a key factor behind their fascinating physics. Here, the authors demonstrate the role of polarization in driving the band topology evolution in twisted transition metal dichalcogenide homobilayers.
- Xiao-Wei Zhang
- , Chong Wang
- & Di Xiao
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Article
| Open AccessHigh spin axion insulator
Existing proposals of axion insulators are limited to spin-1/2 systems. Here the authors put forward a concept of a high spin axion insulator with several peculiar properties, such as the absence of gapless surface states and tunability of the axion field by an external magnetic field.
- Shuai Li
- , Ming Gong
- & X. C. Xie
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Article
| Open AccessEvidence for multiferroicity in single-layer CuCrSe2
The authors observe multiferroicity in a single-layer non van der Waals material, CuCrSe2. The coexistence of room-temperature ferroelectricity and ferromagnetism up to 120 K is corroborated by a set of comprehensive experimental techniques.
- Zhenyu Sun
- , Yueqi Su
- & Baojie Feng
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Article
| Open AccessSpin-orbit torque manipulation of sub-terahertz magnons in antiferromagnetic α-Fe2O3
Antiferromagnetic spintronics offer high speed operations, and reduced issues with stray fields compared to ferromagnetic systems, however, antiferromagnets are typically more challenging to manipulate electrically. Here, Yang, Kim, and coauthors demonstrate electrical control of magnon dispersion and frequency in an α-Fe2O3/Pt heterostructure.
- Dongsheng Yang
- , Taeheon Kim
- & Hyunsoo Yang
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Article
| Open AccessUltrastrong magnon-magnon coupling and chiral spin-texture control in a dipolar 3D multilayered artificial spin-vortex ice
Extending magnetic nanostructures into three dimensions offers a vast increase in potential functionalities, but this typically comes at the expense of ease of fabrication and measurement. Here, Dion et al. demonstrate an approach to creating three dimensional magnetic nanostructures while retaining easy fabrication and readout of established two dimensional approaches.
- Troy Dion
- , Kilian D. Stenning
- & Jack C. Gartside
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Article
| Open AccessTailoring amorphous boron nitride for high-performance two-dimensional electronics
Here, the authors demonstrate a wafer-scale, low-temperature process using atomic layer deposition, for the synthesis of uniform, conformal amorphous boron nitride (aBN) thin films. They further fabricate aBN-encapsulated monolayer MoS2 field-effect transistors.
- Cindy Y. Chen
- , Zheng Sun
- & Joshua A. Robinson
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Article
| Open AccessUnconventional magnetism mediated by spin-phonon-photon coupling
Here Pantazopoulos, Feist, García-Vidal, and Kamra explore the combination spin, phonon and photon coupling in a system of magnetic nanoparticles, and find that it leads to an emergent spin-spin interaction. This interaction is long-range and leads to an unconventional form of magnetism that can exhibit strong magnetization at temperatures very close to the critical temperature.
- Petros Andreas Pantazopoulos
- , Johannes Feist
- & Akashdeep Kamra
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Article
| Open AccessHigh-temperature concomitant metal-insulator and spin-reorientation transitions in a compressed nodal-line ferrimagnet Mn3Si2Te6
The coupling between topological electronic properties and magnetic order offers a promising route for magnetoelectric control with great potential for both applications and fundamental physics. Here, Susilo et al demonstrate the rich tunability of magnetic properties in nodal-line magnetic semiconductor Mn3Si2Te6 using pressure as control knob.
- Resta A. Susilo
- , Chang Il Kwon
- & Jun Sung Kim
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Article
| Open AccessUnconventional superconductivity without doping in infinite-layer nickelates under pressure
The authors theoretically study the pressure dependence of the phase diagram of the nickelate PrNiO2 with and without Sr doping. At high pressure, they find that the superconducting dome is significantly enhanced in both Tc and doping-range of superconductivity compared with ambient pressure, with a maximal Tc of 100 K around 100 GPa in absence of external doping.
- Simone Di Cataldo
- , Paul Worm
- & Karsten Held
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Article
| Open AccessPolar Bloch points in strained ferroelectric films
Authors predict polar Bloch points with negative capacitance in tensile-strained ultrathin ferroelectric PbTiO3 film by phase-field simulations, observing their polarization structures by scanning transmission electron microscopic imaging.
- Yu-Jia Wang
- , Yan-Peng Feng
- & Xiu-Liang Ma
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Article
| Open AccessSpin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4
Previous work proposed the Berry curvature dipole as the mechanism of the nonlinear Hall effect. Lee et al. establish the sign-changing Berry curvature hot spots from spin-orbit split bands as the origin of the Berry curvature dipole and link it to the nonlinear Hall effect in the topological semimetal NbIrTe4.
- Ji-Eun Lee
- , Aifeng Wang
- & Hyejin Ryu
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Article
| Open AccessHalide Perovskite Inducing Anomalous Nonvolatile Polarization in Poly(vinylidene fluoride)-based Flexible Nanocomposites
Wang et al. report large nonvolatile polarization in stretchable polymer ferroelectrics incorporating perovskite nanocrystals. The built-in electric field from poled ferroelectrics stabilises Frenkel defects via interfacial coupling, which can also enhance the polarization of nonferroelectrics.
- Yao Wang
- , Chen Huang
- & Jiangyu Li
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Article
| Open AccessLarge transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces
The conversion between longitudinal heat flow and transverse charge current is a promising energy harvesting technology. Here, the authors show the large transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces.
- Hikari Manako
- , Shoya Ohsumi
- & D. Aoki
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Article
| Open AccessNeutron scattering and neural-network quantum molecular dynamics investigation of the vibrations of ammonia along the solid-to-liquid transition
Through neutron scattering experiments coupled with machine learning, the authors uncover the strong role of nuclear quantum effects in the dynamics of ammonia in both its solid and technologically relevant liquid phase.
- T. M. Linker
- , A. Krishnamoorthy
- & P. D. Vashishta
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Article
| Open AccessEvidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices
The authors study a YbCoIn5/CeCoIn5/YbRhIn5 heterostructure. Using non-reciprocity in the second harmonic transport response, they demonstrate the existence of a specific form of finite-momentum pairing called a helical superconducting state, where the phase of the order parameter is spontaneously spatially modulated.
- T. Asaba
- , M. Naritsuka
- & Y. Matsuda
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Article
| Open AccessObservation of interlayer plasmon polaron in graphene/WS2 heterostructures
Here, the authors report the observation of an interlayer plasmon polaron in heterostructures composed of graphene and monolayer WS2. This is manifested in the ARPES spectra as a strong quasiparticle peak accompanied by several carrier density-dependent shake-off replicas around the WS2 conduction band minimum.
- Søren Ulstrup
- , Yann in ’t Veld
- & Jyoti Katoch
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Article
| Open AccessVisualizing the gas-sensitive structure of the CuZn surface in methanol synthesis catalysis
Industrial methanol synthesis uses materials based on Cu and ZnO. We present high-resolution imaging of active surfaces which reveals how Zn species are transported at the active Cu interface in diffusion processes controlled by the reactant gas composition.
- Sigmund Jensen
- , Mathias H. R. Mammen
- & Jeppe V. Lauritsen
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Article
| Open AccessRevealing the three-dimensional arrangement of polar topology in nanoparticles
Low-dimensional ferroelectric systems are predicted to have topologically nontrivial polar structures, such as vortices or skyrmions. Here authors present atomic-scale 3D topological polar structures in BaTiO3 nanoparticles using atomic electron tomography and revealed their size-dependent transitions.
- Chaehwa Jeong
- , Juhyeok Lee
- & Yongsoo Yang
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Article
| Open AccessSpin disorder control of topological spin texture
Stabilizing non-trivial magnetic spin textures at room temperature remains challenging. Here, the authors propose introducing magnetic atoms into the van der Waals gap of 2D magnets Fe3GaTe2 to stabilize the magnetic spin textures beyond skyrmion.
- Hongrui Zhang
- , Yu-Tsun Shao
- & Ramamoorthy Ramesh
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Article
| Open AccessQuantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
An electron glass state usually occurs in disordered insulating systems. Here the authors report evidence of glassy dynamics of conduction electrons in an electron-doped quantum paraelectric material KTaO3, in the good metal regime, where quantum fluctuations play an important role.
- Shashank Kumar Ojha
- , Sankalpa Hazra
- & Srimanta Middey
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Article
| Open AccessFree-standing ultrathin silicon wafers and solar cells through edges reinforcement
Lightweight and flexible thin crystalline silicon solar cells have huge market potential but remain relatively unexplored. Here, authors present a thin silicon structure with reinforced ring to prepare free-standing 4.7-μm 4-inch silicon wafers, achieving efficiency of 20.33% for 28-μm solar cells.
- Taojian Wu
- , Zhaolang Liu
- & Wenzhong Shen
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Article
| Open AccessAtomic-level polarization reversal in sliding ferroelectric semiconductors
Polarization reversal dynamics in sliding ferroelectrics is important for the application in slidetronics. Here, the authors observe the interlayer directional sliding induced polarization switching with simultaneous hysteresis response in γ-InSe:Y.
- Fengrui Sui
- , Haoyang Li
- & Chungang Duan
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Article
| Open AccessTopologically trivial gap-filling in superconducting Fe(Se,Te) by one-dimensional defects
Previous measurements of FeSe0.45Te0.55 found one-dimensional (1D) defects that were interpretated as domain walls hosting propagating Majorana topological modes. Here, the authors reveal that these 1D defects correspond to sub-surface debris and show that the filling of the superconducting gap on these defects is topologically trivial.
- A. Mesaros
- , G. D. Gu
- & F. Massee
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Article
| Open AccessRevealing the spatial nature of sublattice symmetry
Sublattice symmetry has long been synonymous with chiral symmetry when it comes to topological classification. Here, the authors challenge this notion by systematically investigating sublattice symmetry and revealing its spatial nature with a precise description in terms of symmetry algebra and representation.
- Rong Xiao
- & Y. X. Zhao
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Article
| Open AccessBose-Einstein condensation of non-ground-state caesium atoms
Bose-Einstein condensates (BEC) of ultracold atoms serve as low-entropy sources for a multitude of quantum-science applications. Here, the authors realize a non-ground-state caesium BEC with tunable interactions and tunable loss, opening up new possibilities for polaron and impurity physics.
- Milena Horvath
- , Sudipta Dhar
- & Hanns-Christoph Nägerl
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Article
| Open AccessObservation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
The phase diagram of twisted monolayer-bilayer graphene depends on the electric field direction, exhibiting phases similar to twisted bilayer and double-bilayer graphene. Here the authors study the field dependent electronic structure, in particular flat bands, using nano-ARPES and explain the field-tunability.
- Hongyun Zhang
- , Qian Li
- & Shuyun Zhou
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Article
| Open AccessWeyl spin-momentum locking in a chiral topological semimetal
Spin-momentum locking is a fundamental property of condensed matter systems. Here, the authors evidence parallel Weyl spin-momentum locking of multifold fermions in the chiral topological semimetal PtGa.
- Jonas A. Krieger
- , Samuel Stolz
- & Niels B. M. Schröter
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Article
| Open AccessUniversal scaling law for chiral antiferromagnetism
Chiral antiferromagnets, such as Mn3Pt, host a variety of transport phenomena arising due to the chiral arrangement of the spins. Herein, the authors find two contributions to the anomalous hall effect in Mn3Pt, and through comparison with other chiral antiferromagnets develop a universal scaling law for the anomalous hall effect in chiral antiferromagnets.
- Shijie Xu
- , Bingqian Dai
- & Weisheng Zhao
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Article
| Open AccessCharge density waves tuned by biaxial tensile stress
Previous studies of the effects of strain on charge density waves have mostly focused on uniaxial strain. Here the authors use a biaxial-strain device to demonstrate switching of the charge density wave orientation, as well as a strong linear increase of the transition temperature while the gap seems to saturate.
- A. Gallo–Frantz
- , V. L. R. Jacques
- & D. Le Bolloc’h
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Article
| Open AccessSolving conformal defects in 3D conformal field theory using fuzzy sphere regularization
The study of defects and boundaries in the context of conformal field theory is important but challenging in dimensions higher than two. Here the authors use the recently developed fuzzy sphere regularization approach to perform non-perturbative analysis of defect conformal field theory in 3D
- Liangdong Hu
- , Yin-Chen He
- & W. Zhu
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Article
| Open AccessPhotonic time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5
Photonic time crystal refers to a material whose dielectric properties oscillate in time. Here the authors theoretically show such behaviour in the excitonic insulator candidate Ta2NiSe5 under optical excitation and use it to explain the enhanced THz reflectivity recently observed in pump-probe experiments
- Marios H. Michael
- , Sheikh Rubaiat Ul Haque
- & Eugene Demler
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Article
| Open AccessCurrent-sensitive Hall effect in a chiral-orbital-current state
In most materials, the hall conductivity has a scaling to the longitudinal resistance that varies between linear and quadratic. Here, Zhang et al demonstrate a hall conductivity proportional to the fifth power of the longitudinal conductivity in Mn3Si2Te6, which they attribute to enhanced force on charge carriers due to chiral orbital currents.
- Yu Zhang
- , Yifei Ni
- & Gang Cao
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Article
| Open AccessThree-dimensional domain identification in a single hexagonal manganite nanocrystal
The authors present a 3D determination of the ferroelectric domain structure in a hexagonal yttrium manganite nanocrystal using multi-peak Bragg coherent x-ray diffraction imaging and reconstructing the full displacement field and strain tensor
- Ahmed H. Mokhtar
- , David Serban
- & Marcus C. Newton
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Article
| Open AccessRevealing hidden spin polarization in centrosymmetric van der Waals materials on ultrafast timescales
A major challenge for spin-based information technologies is the generation of spin polarization in otherwise nonmagnetic materials. Here, Arnoldi et al. demonstrate how ultrafast laser excitations can be used to generate spin polarization in a fullerene/tungsten diselenide heterostructure.
- B. Arnoldi
- , S. L. Zachritz
- & B. Stadtmüller
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Article
| Open AccessLocal gate control of Mott metal-insulator transition in a 2D metal-organic framework
The electronic correlation-driven Mott metal-insulator transition has been predicted in a 2D metal-organic framework with a kagome structure. Here the authors synthesize such a system in experiment and demonstrate an electrostatically controlled Mott transition.
- Benjamin Lowe
- , Bernard Field
- & Agustin Schiffrin
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Article
| Open AccessHigh-entropy engineering of the crystal and electronic structures in a Dirac material
Manipulating the electronic properties of topological semimetals is a central goal of modern condensed matter physics research. Here, the authors demonstrate how a high-entropy engineering approach allows for the tuning of the crystal structure and the electronic states in a Dirac semimetal.
- Antu Laha
- , Suguru Yoshida
- & Zhiqiang Mao
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Article
| Open AccessVisualizing a single wavefront dislocation induced by orbital angular momentum in graphene
Phase singularities are intimately related to orbital angular momentum. Direct local imaging of orbital angular momentum effects at the nanoscale remains challenging. Here, the authors demonstrate via scanning tunnelling microscopy that inter-orbital angular momentum scatterings induced by asymmetric potentials can modulate the phase singularities and induce single-wavefront dislocations.
- Yi-Wen Liu
- , Yu-Chen Zhuang
- & Lin He
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Article
| Open AccessA substitutional quantum defect in WS2 discovered by high-throughput computational screening and fabricated by site-selective STM manipulation
Point defects in 2D semiconductors have potential for quantum computing applications, but their controlled design and synthesis remains challenging. Here, the authors identify and fabricate a promising quantum defect in 2D WS2 via high-throughput computational screening and scanning tunnelling microscopy.
- John C. Thomas
- , Wei Chen
- & Geoffroy Hautier
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Article
| Open AccessCollapse of carbon nanotubes due to local high-pressure from van der Waals encapsulation
vdW assembly of low-dimensional materials has proven the capability of creating structures with on-demand properties. Here, the authors report on the structural collapse of CNTs in conjunction with a metal-semiconductor junction induced by the VdW encapsulation.
- Cheng Hu
- , Jiajun Chen
- & Zhiwen Shi
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Article
| Open AccessQuantum annealing of a frustrated magnet
Quantum annealing is usually discussed as a means of finding an optimal solution for a problem where there are many local minima, such as the travelling salesman. Here, Zhao et al present an intriguing example of quantum annealing in the case of the frustrated magnet α-CoV2O6, where a transverse magnetic field triggers the quantum annealing process.
- Yuqian Zhao
- , Zhaohua Ma
- & Yuesheng Li
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Article
| Open AccessMagnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3
Recently, excitons with unconventional properties were reported in a van der Waals antiferromagnet NiPS3. Here, using resonant inelastic x-ray scattering, the authors show that the formation of these excitons is primarily driven by Hund’s coupling and that they propagate similarly to two-magnon excitations.
- W. He
- , Y. Shen
- & M. P. M. Dean
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Article
| Open AccessPlanar thermal Hall effect from phonons in a Kitaev candidate material
The thermal Hall effect is a novel probe of neutral excitations in insulators; however, the mechanism behind one type of neutral excitations – phonons – is still unclear. Here the authors observe a planar thermal Hall effect in the Kitaev candidate material Na2Co2TeO6 and proposed that it is generated by phonons.
- Lu Chen
- , Étienne Lefrançois
- & Louis Taillefer
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Article
| Open AccessFlower-shaped 2D crystals grown in curved fluid vesicle membranes
Thin crystals grown on rigid spherical templates of increasing curvature exhibit increased protrusions. Here, the authors demonstrate the opposite curvature effect on the morphology of molecularly thin crystals grown within elastic fluid membranes, like those of biological cells.
- Hao Wan
- , Geunwoong Jeon
- & Maria M. Santore
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Article
| Open AccessQuantum critical phase of FeO spans conditions of Earth’s lower mantle
Large-scale eDMFT computation reveals that FeO undergoes a gradual orbitally selective insulator-metal transition across the extreme conditions of Earth’s interior, with implications for compositions and conductivity of the core-mantle boundary region.
- Wai-Ga D. Ho
- , Peng Zhang
- & Vasilije V. Dobrosavljevic
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Article
| Open AccessCorrelation between two distant quasiparticles in separate superconducting islands mediated by a single spin
The authors experimentally study a chain of superconducting islands (SI) and quantum dots (QD), where a Bogoliubov quasiparticle occupies each SI. They demonstrate correlations between the quasiparticles in each SI mediated by a single spin on the QD, known as an “over-screened" doublet state of the QD.
- Juan Carlos Estrada Saldaña
- , Alexandros Vekris
- & Jesper Nygård
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Article
| Open AccessRoom-temperature stabilizing strongly competing ferrielectric and antiferroelectric phases in PbZrO3 by strain-mediated phase separation
There is a desire to know how the threefold ferrielectric coexists with the antiferroelectric phase. Here, the authors realize a threefold-modulated ferrielectric phase regulated by strain-mediated phase separation in PbZrO3 thin film.
- Ziyi Yu
- , Ningbo Fan
- & Fangfang Xu
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