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| Open AccessFrequency tunable magnetostatic wave filters with zero static power magnetic biasing circuitry
Magnetostatic wave filters have a wide working frequency range, small size and high Q-factor, however, they are hampered by the need for a large external electromagnet to provide a bias magnetic field. Here, Du et al demonstrate an extremely small and low power external magnetic bias assembly with zero static power consumption, removing the need for bulky and energy intensive electromagnets.
- Xingyu Du
- , Mohamad Hossein Idjadi
- & Roy H. Olsson III
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Article
| Open AccessPassive frequency comb generation at radiofrequency for ranging applications
In contrast to the commonly studied optical frequency combs, here, the authors demonstrate a radio frequency system able to wirelessly and passively generate frequency combs as a battery-free solution for far-field ranging of unmanned vehicles in GPS-denied settings.
- Hussein M. E. Hussein
- , Seunghwi Kim
- & Cristian Cassella
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Article
| Open AccessElectrically driven amplification of terahertz acoustic waves in graphene
Electron–phonon interactions are a crucial aspect of high-quality graphene devices. Here, the authors show that graphene resistivity grows strongly in the direction of the carrier flow when the drift velocity exceeds the speed of sound due to the electrical amplification of acoustic terahertz phonons.
- Aaron H. Barajas-Aguilar
- , Jasen Zion
- & Javier D. Sanchez-Yamagishi
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Article
| Open AccessHigher order gaps in the renormalized band structure of doubly aligned hBN/bilayer graphene moiré superlattice
In moiré superlattices, a multitude of higher order Bragg gaps and van Hove singularities emerges as the band structure renormalizes. Here, the authors map these gaps uniquely to the recently predicted topological Bragg indices of the underlying supermoiré lattice.
- Mohit Kumar Jat
- , Priya Tiwari
- & Aveek Bid
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Article
| Open AccessUltrastrong to nearly deep-strong magnon-magnon coupling with a high degree of freedom in synthetic antiferromagnets
Deep-strong coupling in hybrid magnonic systems is yet to be explored. Here, the authors unveil unconventional coupling properties in synthetic antiferromagnets. The systems’ high degree of freedom enables a near-realization of deep-strong coupling.
- Yuqiang Wang
- , Yu Zhang
- & Guoqiang Yu
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Article
| Open AccessVoltage-based magnetization switching and reading in magnetoelectric spin-orbit nanodevices
The authors realize voltage-based magnetization switching and reading in nanodevices at room temperature, through exchange coupling between multiferroic BiFeO3 and ferromagnetic CoFe, for writing, and spin-to-charge current conversion between CoFe and Pt, for reading.
- Diogo C. Vaz
- , Chia-Ching Lin
- & Fèlix Casanova
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Article
| Open AccessCurrent-induced switching of a van der Waals ferromagnet at room temperature
Fe3GaTe2 is a van der Waals material with a Curie temperature well above room temperature, making it an attractive material for integration into spintronic devices. Here, Kajale et al demonstrate spin-orbit torque induced switching of the magnetization of Fe3GaTe2, above room temperature, using a Pt spin Hall layer.
- Shivam N. Kajale
- , Thanh Nguyen
- & Deblina Sarkar
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Article
| Open AccessElectric control of optically-induced magnetization dynamics in a van der Waals ferromagnetic semiconductor
The combination of strong light-matter interactions and controllable magnetic properties make magnetic semiconductors attractive for both fundamental physics and the development of devices. Here, Hendriks et al show how the optically driven magnetization dynamics in Cr2Ge2Te6 can be controlled via electrostatic gating.
- Freddie Hendriks
- , Rafael R. Rojas-Lopez
- & Marcos H. D. Guimarães
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Article
| Open AccessAcoustic-driven magnetic skyrmion motion
Skyrmions, a type of topological spin texture, have garnered interest for use in spintronic devices. Typically, these devices necessitate moving the skyrmions via applied currents. Here, Yang et al demonstrate the driving of skyrmions by surface acoustic waves.
- Yang Yang
- , Le Zhao
- & Tianxiang Nan
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| Open AccessStrain-restricted transfer of ferromagnetic electrodes for constructing reproducibly superior-quality spintronic devices
To optimize the interfacial quality and electrode magnetism in spintronic devices, the authors develop an electrode transfer technique that can greatly improve device interfacial quality, performance and reproducibility, universal to various spacers.
- Lidan Guo
- , Xianrong Gu
- & Xiangnan Sun
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Article
| Open AccessToward grouped-reservoir computing: organic neuromorphic vertical transistor with distributed reservoir states for efficient recognition and prediction
Existing neuromorphic hardware, focusing mainly on shallow-reservoir computing, is challenged in providing adequate spatial and temporal scales characteristic for effective computing. Here, Gao et al. report an ultra-short channel organic neuromorphic vertical transistor with distributed reservoir states.
- Changsong Gao
- , Di Liu
- & Huipeng Chen
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Article
| Open AccessUltrafast THz probing of nonlocal orbital current in transverse multilayer metallic heterostructures
By optically driving the magnetization in a magnetic system, terahertz emission can be induced from an adjacent normal metal, as a result of spin-to-charge conversion. Here, Kumar and Kumar successfully show the equivalent effect arising from orbital-to-charge conversion.
- Sandeep Kumar
- & Sunil Kumar
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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 AccessTime, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems
Pump-probe techniques—where a system is driven into a nonequilibrium state and then studied as a function of time—provide rich information about the behaviour of charge carriers and their interactions. Here, Yoo et al extend this class of techniques by injecting electrons at a selected energy and observing their decay in energy and momentum space.
- H. M. Yoo
- , M. Korkusinski
- & R. C. Ashoori
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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 AccessHeat current-driven topological spin texture transformations and helical q-vector switching
Topological spin textures, such as skyrmions and antiskyrmions are of interest for use in information storage, owing to their inherent robustness. Critical to this use is the ability to manipulate these spin textures. Here, Yasin et al. demonstrate heat current driven transformation of a topological spin texture in a ferromagnet at room temperature.
- Fehmi Sami Yasin
- , Jan Masell
- & Xiuzhen Yu
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Article
| Open AccessIn-situ electro-responsive through-space coupling enabling foldamers as volatile memory elements
Molecular electronics holds promise for building memristor at nanoscales for in-memory computing. Li et al. design tailored foldamers with furan-benzene and thiophene-benzene stacking to achieve voltage triggered quantum interference switching for potential random number generator application.
- Jinshi Li
- , Pingchuan Shen
- & Zujin Zhao
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Article
| Open AccessAn anisotropic van der Waals dielectric for symmetry engineering in functionalized heterointerfaces
Here, the authors demonstrate that a layered anisotropic dielectric material, SiP2, can break the rotational symmetry of 2D MoS2, leading to linearly polarized photoluminescence emission and conductance anisotropy ratios up to 1000 in gated SiP2/MoS2 heterostructures.
- Zeya Li
- , Junwei Huang
- & Hongtao Yuan
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| Open AccessSynergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures
Here, the authors theoretically predict the formation of synergistic correlated and topological states in Coulomb-coupled and gate-tunable graphene/insulator heterostructures, proposing a number of promising substrate candidates and a possible explanation for recent experimental observations in graphene/CrOCl heterostructures.
- Xin Lu
- , Shihao Zhang
- & Jianpeng Liu
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Article
| Open AccessImpact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
Many proposed spintronic devices, where spin, rather than charge is used for information processing, rely on the combination of multiple materials, for example, heavy metals and magnetic materials in spin-orbit torque devices. Here, Gao et al. show how the interface between a ferromagnet and a semimetal, Ni81Fe19/Bi0.1Sb0.9, can result in a barrier-mediated spin-orbit torques
- Tenghua Gao
- , Alireza Qaiumzadeh
- & Kazuya Ando
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| Open AccessAnomalous electronic transport in high-mobility Corbino rings
Metallic resistance of two-dimensional electron gases normally increases with temperature increasing. Here, the authors find a resistance decrease with increasing temperature at very low temperatures in two-dimensional electron metal described by Fermi liquid theory.
- Sujatha Vijayakrishnan
- , F. Poitevin
- & G. Gervais
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Article
| Open AccessSpin current driven by ultrafast magnetization of FeRh
In some magnetic materials, it is possible to magnetize or demagnetize the system on extremely short timescales. The angular momentum carried by the magnetic state must be generated or dissipated. Here, Kang et al find a significant correlation between spin current and the magnetization dynamics in the ultrafast magnetization processes, implying angular momentum transfer from electrons to magnons.
- Kyuhwe Kang
- , Hiroki Omura
- & Gyung-Min Choi
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Article
| Open AccessDirect observation of hot-electron-enhanced thermoelectric effects in silicon nanodevices
Thermoelectric property of silicon itself is important for the thermal management of post-Moore nanoelectronics. Here, Xue et al directly observe unconventional thermoelectric cooling/heating effects enhanced by hot electrons in silicon nanodevices.
- Huanyi Xue
- , Ruijie Qian
- & Wei Lu
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Article
| Open AccessExperimental demonstration of a skyrmion-enhanced strain-mediated physical reservoir computing system
An energy-efficient physical reservoir is crucial for reservoir computing (RC). Here the authors demonstrate an all-electric skyrmion-enhanced strain-mediated physical RC system and achieve a benchmark chaotic time series prediction.
- Yiming Sun
- , Tao Lin
- & Weisheng Zhao
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Article
| Open AccessNon-Hermitian control between absorption and transparency in perfect zero-reflection magnonics
Absorption, transmission and reflection are three processes characterizing optical devices. Absorption allows for signal conversion and transmission is important for signal transfer, however, reflection is frequently detrimental to device performance. Here, Qian et al demonstrate a magnonic device with controllable absorption and transmission while maintain zero reflection.
- Jie Qian
- , C. H. Meng
- & C. -M. Hu
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Article
| Open AccessThermally stable threshold selector based on CuAg alloy for energy-efficient memory and neuromorphic computing applications
Designing efficient selector devices remains a challenge. Here, the authors propose a CuAg alloy-based selector with excellent ON/OFF ratio and thermal stability. It can effectively suppress the sneak-path current in 1S1R arrays, making it suitable for storage class memory and neuromorphic computing applications.
- Xi Zhou
- , Liang Zhao
- & Dongdong Li
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Article
| Open AccessMulti-state data storage in a two-dimensional stripy antiferromagnet implemented by magnetoelectric effect
In a magneto-electric material, the magnetic and electric properties are coupled. This coupling allows the magnetic order to be controlled by electric stimuli, making magnetoelectric materials promising candidates for new data storage technologies. Here Gu et al demonstrate a magnetoelectric effect in a van der Waals antiferromagnetic CrOCl which persists down to monolayer, and using this realize a multi-state data storage device.
- Pingfan Gu
- , Cong Wang
- & Yu Ye
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Article
| Open AccessField-free spin-orbit torque switching via out-of-plane spin-polarization induced by an antiferromagnetic insulator/heavy metal interface
Electrically switching perpendicular magnetized ferromagnets using spin-orbit torques without assisting magnetic fields is a major goal for spintronics. Recently, several works have proposed using out-of-plane spin polarized currents to achieve this, but these rely on antiferromagnetic metals with low Neel temperatures. Here, Wang et al show that such out-of-plane spin polarization driven switching can be achieved using the interface of an antiferromagnetic insulator and a heavy metal.
- Mengxi Wang
- , Jun Zhou
- & Yong Jiang
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Article
| Open AccessProbing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling
van der Waals magnetic materials, which retain magnetism down to a single two-dimensional layer of atoms, have great technological potential for spin-based information processing, however, typical approaches to measure their spin dynamics are often hampered by the small number of spins in a single atomic layer compared to three dimensional materials. Here, Zollitsch et al present a methodology for the detection of spin dynamics in van der Waals magnets via photon-magnon coupling between it and a superconducting resonator, with potential to resolve spin dynamics down to a single monolayer.
- Christoph W. Zollitsch
- , Safe Khan
- & Hidekazu Kurebayashi
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Article
| Open AccessA self-adaptive hardware with resistive switching synapses for experience-based neurocomputing
A big challenge for artificial intelligence is to gain the ability of learning by experience like biological systems. Here Bianchi et al. propose a hardware neural network based on resistive-switching synaptic arrays which dynamically adapt to the environment for autonomous exploration.
- S. Bianchi
- , I. Muñoz-Martin
- & D. Ielmini
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Article
| Open AccessSub-micron spin-based magnetic field imaging with an organic light emitting diode
Previous demonstrations of electrically and optically detected magnetic resonance in OLED materials have established these systems as promising candidates for magnetic field sensing. Here the authors present an integrated OLED-based device for magnetic field imaging with sub-micron resolution.
- Rugang Geng
- , Adrian Mena
- & Dane R. McCamey
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Article
| Open AccessHybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures
Spin-hall nano-oscillators have potential for use in neuromorphic computing applications. Normally they are based around combination platinum and permalloy. Here, the authors combine a permalloy ferromagnet with a low magnetic damping ferrimagnet, leading to significantly improved performance.
- Haowen Ren
- , Xin Yu Zheng
- & Andrew D. Kent
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Article
| Open AccessQuantum enhanced radio detection and ranging with solid spins
Quantum sensors based on NV centers in diamond are well established, however the sensitivity of detection of high-frequency radio signals has been limited. Here the authors use nanoscale field-focusing to enhance sensitivity and demonstrate ranging for GHz radio signals in an interferometer set-up.
- Xiang-Dong Chen
- , En-Hui Wang
- & Fang-Wen Sun
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Article
| Open AccessNanoscale imaging of super-high-frequency microelectromechanical resonators with femtometer sensitivity
Implementing MEMS resonators calls for detailed microscopic understanding of the devices and imperfections from microfabrication. Lee et al. imaged super-high-frequency acoustic resonators with a spatial resolution of 100 nm and a displacement sensitivity of 10 fm/√Hz. Individual overtones, spurious modes, and acoustic leakage are also visualized and analyzed.
- Daehun Lee
- , Shahin Jahanbani
- & Keji Lai
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Article
| Open AccessSpintronic leaky-integrate-fire spiking neurons with self-reset and winner-takes-all for neuromorphic computing
Designing bio-inspired artificial neurons within a single device is challenging. Here, the authors demonstrate a spintronic neuron with leaky-integrate-fire and self-reset characteristics and corroborate a new trajectory of all-spin neuromorphic computing hardware holistic implementation.
- Di Wang
- , Ruifeng Tang
- & Guozhong Xing
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Article
| Open AccessBroadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip
Electron spins in diamond allow magnetometry with high sensitivity, but the bandwidth in the microwave regime is limited to a narrow band around their resonance frequency. Here, the authors solve this problem by coupling the spins to a thin film of yttrium iron garnet, exploiting the non-linear spin-wave dynamics of the magnet.
- Joris J. Carmiggelt
- , Iacopo Bertelli
- & Toeno van der Sar
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Article
| Open AccessCoherence protection of spin qubits in hexagonal boron nitride
Spin defects in 2D hBN are promising for magnetic field sensing but suffer from short spin coherence times. Here the authors extend the coherence time for an ensemble of spins in hBN to 4 microseconds by using a continuous microwave drive and demonstrate qubit control in a protected spin space.
- Andrew J. Ramsay
- , Reza Hekmati
- & Isaac J. Luxmoore
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Article
| Open AccessObservation of electronic modes in open cavity resonator
Electron optics draws upon the resemblance between electron and optical waves. Here, the authors report on the observation of electron mode formation in open cavity resonators realized in a GaAs/AlGaAs two-dimensional electronic gas.
- Hwanchul Jung
- , Dongsung T. Park
- & Hyung Kook Choi
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Article
| Open AccessStrong room-temperature bulk nonlinear Hall effect in a spin-valley locked Dirac material
The nonlinear Hall effect (NLHE) results in a second-harmonic transverse voltage in response to alternating longitudinal current in zero magnetic field and has so far only been observed at low temperatures in bulk materials. Here, the authors observe bulk NLHE at room temperature in the Dirac material BaMnSb2, which will provide a large photocurrent for applications in THz detection.
- Lujin Min
- , Hengxin Tan
- & Zhiqiang Mao
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Article
| Open AccessGeneral low-temperature growth of two-dimensional nanosheets from layered and nonlayered materials
Chemical vapor deposition (CVD) is a versatile method to synthesize 2D materials, but usually requires high growth temperatures. Here, the authors report a BiOCl-assisted CVD approach to grow 2D nanosheets from 27 different layered and nonlayered materials at temperatures <500 °C, which are compatible with back-end-of-the-line industrial processes.
- Biao Qin
- , Muhammad Zeeshan Saeed
- & Xidong Duan
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Article
| Open AccessSelf-powered high-sensitivity all-in-one vertical tribo-transistor device for multi-sensing-memory-computing
Designing efficient sensing-memory-computing systems remains a challenge. Here, the authors propose a self-powered vertical tribo-transistor based on MXenes to implement the multi-sensing-memory-computing function and the interaction of multisensory integration.
- Yaqian Liu
- , Di Liu
- & Huipeng Chen
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Article
| Open AccessHigh thermal conductivity in wafer-scale cubic silicon carbide crystals
High thermal conductivity electronic materials are critical for next-generation electronics and photonics. Here, the authors report isotropic high thermal conductivity of 3C-SiC wafers exceeding 500 W m−1K−1.
- Zhe Cheng
- , Jianbo Liang
- & David G. Cahill
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Article
| Open AccessThree-to-one analog signal modulation with a single back-bias-controlled reconfigurable transistor
Designing efficient reconfigurable field effect transistors remains a challenge. Here, the authors develop a transistor with three distinct operation modes, realized directly on an industrial 22nm FDSOI platform, demonstrating a reconfigurable analog circuit element with signal follower, phase shifter, and frequency doubler operation.
- Maik Simon
- , Halid Mulaosmanovic
- & Jens Trommer
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Article
| Open AccessThe gate injection-based field-effect synapse transistor with linear conductance update for online training
The conventional von Neumann computing architecture is ill suited to data intensive tasks as data must be repeated moved between the separated processing and memory units. Here, Seo et al propose a CMOS compatible, highly linear gate injection field-effect transistor where data can be both stored and processed.
- Seokho Seo
- , Beomjin Kim
- & Shinhyun Choi
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Article
| Open AccessStandardized measurement of dielectric materials’ intrinsic triboelectric charge density through the suppression of air breakdown
Determining the triboelectric charge and energy density of dielectric materials is generally limited by many factors, failing to reflect their intrinsic behaviour. Here, a standardized strategy is proposed employing contact-separation TENG and supressing air-breakdown to assess max triboelectric charge and energy densities leading to an updated triboelectric series.
- Di Liu
- , Linglin Zhou
- & Zhong Lin Wang
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Article
| Open AccessAll-optical control of spin in a 2D van der Waals magnet
The use of light in driving the magnetization of materials has great technological potential, as well as allowing for insights into the fast dynamics of magnetic systems. Here, the authors combine CrI3, a van der Waals magnet, with WSe2, and demonstrate all optical switching of the resulting heterostructure.
- Maciej Da̧browski
- , Shi Guo
- & Robert J. Hicken
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Article
| Open AccessTwo-particle time-domain interferometry in the fractional quantum Hall effect regime
Excitations of the fractional quantum Hall states are of great interest because they obey anyonic statistics, but electronic interferometers give contrasting results about their quantum coherence. Here the authors use novel two-particle time-domain interferometry to show that quantum coherence is indeed preserved.
- I. Taktak
- , M. Kapfer
- & D. C. Glattli
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Article
| Open AccessGrowth of bilayer MoTe2 single crystals with strong non-linear Hall effect
2D transition metal ditellurides exhibit nontrivial topological phases, but the controlled bottom-up synthesis of these materials is still challenging. Here, the authors report the layer-by-layer growth of large-area bilayer and trilayer 1T’ MoTe2 films, showing thickness-dependent ferroelectricity and nonlinear Hall effect.
- Teng Ma
- , Hao Chen
- & Kian Ping Loh
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Article
| Open AccessFlying electron spin control gates
Spin qubits are a platform for quantum computing. There are many advantages for quantum information processing if the spin qubit can move. Here, Helgers et al. use a surface acoustic wave to define a moving quantum dot and demonstrate the magneticfield-free control of the spin precession, bringing “flying” spin qubits a step closer.
- Paul L. J. Helgers
- , James A. H. Stotz
- & Paulo V. Santos