

Article
 Open AccessA Brewster route to Cherenkov detectors
Cherenkov detectors are used to detect high energy particles and their performance capabilities depend heavily on the material used. Here, the authors propose use of a Brewsteropticsbased angular filter for a detector with increased sensitivity and particle identification capability.
 Xiao Lin
 , Hao Hu
 & Yu Luo

Article
 Open AccessTopological phase transition in chiral graphene nanoribbons: from edge bands to end states
Graphene nanoribbons are potential systems for engineering topological phases of matter, but the prerequired gapped phases are difficult to find. Here, the authors show that chiral graphene nanoribbons undergo a transition from metallic to topological insulators, and then to trivial band insulators as they are narrowed down to nanometer widths.
 Jingcheng Li
 , Sofia Sanz
 & Jose Ignacio Pascual

Article
 Open AccessThe relevance of rock shape over mass—implications for rockfall hazard assessments
The awareness of rock shape dependence in rockfall hazard assessment is growing, but experimental and field studies are scarce. This study presents a large data set of induced single block rockfall events quantifying the influence of rock shape and mass on its complex kinematic behaviour.
 Andrin Caviezel
 , Adrian Ringenbach
 & Perry Bartelt

Article
 Open AccessLocalelectrostaticsinduced oxygen octahedral distortion in perovskite oxides and insight into the structure of Ruddlesden–Popper phases
The authors observe twodimensional shear faults in five different perovskitetype materials and detailed structures of more than 80 oxides and halides to elucidate an electrostatic origin for Jahn–Tellertype tetragonal distortion of oxygen octahedra.
 Youngjae Hong
 , Pilgyu Byeon
 & SungYoon Chung

Article
 Open AccessTransverse barrier formation by electrical triggering of a metaltoinsulator transition
Resistive switching usually occurs by the formation of conducting filaments in the direction of current flow. Here the authors study an intriguing type of volatile metaltoinsulator resistive switching in (La,Sr)MnO_{3}, which occurs by the formation of an insulating barrier perpendicular to the current.
 Pavel Salev
 , Lorenzo Fratino
 & Ivan K. Schuller

Article
 Open AccessNarrowband highlying excitons with negativemass electrons in monolayer WSe_{2}
Here, the authors report on evidence of an excitonic species formed by electrons in highenergy conduction band states with a negative effective mass, explaining previous observations of quantum interference phenomena in twodimensional semiconductors.
 KaiQiang Lin
 , Chin Shen Ong
 & John M. Lupton

Article
 Open AccessDemonstration of valley anisotropy utilized to enhance the thermoelectric power factor
Valley anisotropy is proposed theoretically to benefit the electrical transport of thermoelectric materials but it lacks experimental demonstration. Here, the authors demonstrate how to utilize the single anisotropic Fermi pocket in ptype Mg_{3}Sb_{2} to enhance its thermoelectric properties.
 Airan Li
 , Chaoliang Hu
 & Tiejun Zhu

Article
 Open AccessRealization of topological Mott insulator in a twisted bilayer graphene lattice model
Magicangle twisted bilayer graphene exhibits a quantum anomalous Hall effect at 3/4 filling; however, its mechanism is debated. Here, the authors show that such a phase can be realized in a lattice model of twisted bilayer graphene in the strong coupling limit, and interpret the results in terms of a topological Mott insulator phase.
 BinBin Chen
 , Yuan Da Liao
 & Zi Yang Meng

Article
 Open AccessVacuumfieldinduced THz transport gap in a carbon nanotube quantum dot
Strong lightmatter coupling has been realized at the level of single atoms and photons throughout most of the electromagnetic spectrum, except for the THz range. Here, the authors report a THzscale transport gap, induced by vacuum fluctuations in carbon nanotube quantum dot through the deep strong coupling of a single electron to a THz resonator.
 F. Valmorra
 , K. Yoshida
 & T. Kontos

Article
 Open AccessStrong correlation between electronic bonding network and critical temperature in hydrogenbased superconductors
Several hydrides have been observed highT_{c} superconductivity under pressure, but a physicalchemical understanding of the properties enhancing T_{c} is still lacking. Here, the authors propose a magnitude named as networking value, combined with hydrogen fraction and the contribution of hydrogen to the density of states at Fermi level, can predict T_{c} of all hydrogenbased compounds with an accuracy of about 60 K.
 Francesco Belli
 , Trinidad Novoa
 & Ion Errea

Article
 Open AccessEvidence of twodimensional flat band at the surface of antiferromagnetic kagome metal FeSn
Transition metal kagome compounds have been shown to host flat bands in their bulk electronic spectrum. Here, using planar tunnelling spectroscopy supported by firstprinciples calculations, the authors report the signature of a novel type of flat band at the surface of antiferromagnetic kagome metal FeSn.
 Minyong Han
 , Hisashi Inoue
 & Joseph G. Checkelsky

Article
 Open AccessReprogrammable plasmonic topological insulators with ultrafast control
The development of fast and dynamic topological photonic platforms is an ongoing challenge. Here, the authors demonstrate a reprogrammable plasmonic topological insulator in which ultrafast electric switches allow for nanosecondlevel switching time between different configurations.
 Jian Wei You
 , Qian Ma
 & Tie Jun Cui

Article
 Open AccessSpin/valley pumping of resident electrons in WSe_{2} and WS_{2} monolayers
Optical excitation of transition metal dichalcogenide monolayers mostly generates excitons species with inherently short lifetime and spin/valley relaxation time. Here, the authors demonstrate efficient spin/valley optical pumping of resident electrons in ndoped WSe_{2} and WS_{2} monolayers.
 Cedric Robert
 , Sangjun Park
 & Xavier Marie

Article
 Open AccessQuantum state tomography of molecules by ultrafast diffraction
Ultrafast diffraction is fundamental in capturing the structural dynamics of molecules. Here, the authors establish a variant of quantum state tomography for arbitrary degrees of freedom to characterize the molecular quantum states, which will enable the reconstruction of a quantum molecular movie from diffraction data.
 Ming Zhang
 , Shuqiao Zhang
 & Zheng Li

Article
 Open AccessPressure induced superconductivity in MnSe
Superconductivity in FeSe attracted great interests to understand the mechanism of high temperature superconductivity. Here, the authors report a pressure induced superconductivity with a highest T_{c} of ~9 K in MnSe.
 T. L. Hung
 , C. H. Huang
 & T. K. Lee

Article
 Open AccessDesign and realization of topological Dirac fermions on a triangular lattice
Atomic monolayers of largegap quantum spin Hall insulators are challenging to synthesize. Here, the authors realize massive Dirac fermions emerging from Bloch wavefunction interference on a triangular lattice and achieve topologically nontrivial domains with unprecedented spatial extension.
 Maximilian Bauernfeind
 , Jonas Erhardt
 & Giorgio Sangiovanni

Article
 Open AccessObservation of higherorder nonHermitian skin effect
Though nonHermitian physics has contributed toward the advance of research in quantum, electronic and classical systems, previous work focused on zero or onedimensional systems. Here, the authors report higherorder nonHermitian skin effects in a 2D acoustic higherorder topological insulator.
 Xiujuan Zhang
 , Yuan Tian
 & YanFeng Chen

Article
 Open AccessMotional narrowing, ballistic transport, and trapping of roomtemperature exciton polaritons in an atomicallythin semiconductor
Roomtemperature exciton polaritons in a monolayer WS_{2} are shown to display strong motional narrowing of the linewidth and enhanced firstorder coherence. They can propagate for tens of micrometers while maintaining partial coherence, and display signatures of ballistic (dissipationless) transport.
 M. Wurdack
 , E. Estrecho
 & E. A. Ostrovskaya

Article
 Open AccessFieldtunable toroidal moment in a chirallattice magnet
Toroidal moments arise from vortex like spin arrangements. These moments can then interact, giving rise to ferri or ferrotoroidal order, though controlling such order is difficult. Here, the authors demonstrate a ferritoroidal state in BaCoSiO_{4}, which under an applied magnetic field exhibits multiple toroidal and metamagnetic transitions.
 Lei Ding
 , Xianghan Xu
 & Huibo Cao

Article
 Open AccessUnconventional supercurrent phase in Ising superconductor Josephson junction with atomically thin magnetic insulator
Van der Waals structures provide a new platform to explore novel physics of superconductor/ferromagnet interfaces. Here, NbSe_{2} Josephson junction with Cr_{2}Ge_{2}Te_{6} enables nontrivial Josephson phase by spindependent interaction, boosting the study of superconducting states with spinorbit coupling and phasecontrolled quantum electronic device.
 H. Idzuchi
 , F. Pientka
 & P. Kim

Article
 Open AccessCoexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe_{2} superconductor
The interplay between superconductivity and charge density wave (CDW) gives rise to exotic quantum phenomena. Here, the authors observe magnetoresistance oscillations and an anomalous metal state due to the coexistence of superconductivity and CDW in lithium intercalated TiSe_{2}.
 Menghan Liao
 , Heng Wang
 & QiKun Xue

Article
 Open AccessDecay and renormalization of a longitudinal mode in a quasitwodimensional antiferromagnet
Anisotropic spin S >1/2 quantum magnets can have multiple low energy modes. In this manuscript, the authors study the interaction of such low energy modes in the S = 1 antiferromagnet Ba_{2}FeSi_{2}O_{7} by combining neutron scattering measurements with an SU(3) generalization of the 1/S expansion.
 SeungHwan Do
 , Hao Zhang
 & Andrew D. Christianson

Article
 Open AccessFractionalized conductivity and emergent selfduality near topological phase transitions
Conventional quantum particles can break up into fractionalized excitations under the right conditions; however, their direct experimental observation is challenging. Here, the authors predict strong optical conductivity signatures of such excitations in the vicinity of a topological phase transition.
 YanCheng Wang
 , Meng Cheng
 & Zi Yang Meng

Article
 Open AccessTransport in helical Luttinger liquids in the fractional quantum Hall regime
Previous work has shown that helical domain walls can form between states of different spinpolarization during a ferromagnetic spin transition in the fractional quantum Hall regime. Here, the authors study the transport through a single helical domain wall and find strong deviations from a simplified theory of weakly interacting edge channels.
 Ying Wang
 , Vadim Ponomarenko
 & Leonid P. Rokhinson

Article
 Open AccessMagnetic skyrmion braids
Skyrmions are topological twodimensional spin textures that in threedimensional systems resemble strings or tubes. Here, using transmission electron microscopy Zheng et al observe the braiding of skyrmion strings in FeGe and predict this phenomenon for a large family of magnets.
 Fengshan Zheng
 , Filipp N. Rybakov
 & Rafal E. DuninBorkowski

Article
 Open AccessFerroelectric phasetransition frustration near a tricritical composition point
Phase transition brings a plethora of exotic phenomena and intriguing effects such as spin and charge frustration. However, the phase transition order is not always explicit. Here, the authors discover phase transition frustration near a tricritical composition point in ferroelectric Pb(Zr,Ti)O_{3}.
 XianKui Wei
 , Sergei Prokhorenko
 & ZuoGuang Ye

Article
 Open AccessElectronic Floquet gyroliquid crystal
The nonequilibrium regime provides an exciting frontier in the search for novel quantum phases of matter. Here, the authors show that optically driving a lightlydoped semiconductor can lead to the spontaneous formation of a dynamical quantum liquid crystalline phase with a rotating magnetization.
 Iliya Esin
 , Gaurav Kumar Gupta
 & Netanel H. Lindner

Article
 Open AccessLarge ultrafastmodulated Voigt effect in noncollinear antiferromagnet Mn_{3}Sn
Mn3Sn is an antiferromagnetic material which displays a large magnetooptical Kerr effect, despite lacking a ferromagnetic moment. Here, the authors show that likewise, Mn3Sn, also presents a particularly large magnetooptical Voigt signal, with a negligible change in the quench time over a wide temperature range.
 H. C. Zhao
 , H. Xia
 & H. B. Zhao

Article
 Open AccessQuantized classical response from spectral winding topology
Quantized response has so far eluded classical system beyond linear response theory. Here, the authors predict that a quantized classical response, arising from fundamental mathematical properties of the Green’s function, shows up in steadystate response of a nonHermitian system without invoking a linear response theory.
 Linhu Li
 , Sen Mu
 & Jiangbin Gong

Article
 Open AccessMultistep nucleation of anisotropic molecules
Multistep nucleation phenomena are of considerable fundamental interest. Here the authors combine molecular dynamics, machine learning and molecular cluster analysis to investigate the multistep nucleation of smectic clusters from a nematic fluid that cannot be accounted for by the classical nucleation theory.
 Kazuaki Z. Takahashi
 , Takeshi Aoyagi
 & Junichi Fukuda

Article
 Open AccessDirect measurement of ferroelectric polarization in a tunable semimetal
Free carriers and electrical polarization coexist in ferroelectric metals. Here, the authors use a capacitive method to probe the electronic compressibility of free carriers in a tunable semimetal, extract the polarized contribution, and study the carrier dependence of the ferroelectric state.
 Sergio C. de la Barrera
 , Qingrui Cao
 & Benjamin M. Hunt

Article
 Open AccessEvidence of a coupled electronphonon liquid in NbGe_{2}
It was predicted that in the regime of strong electronphonon interactions, electrons and phonons can form a coupled nonequilibrium state, characterized by the conservation of the total momentum and by hydrodynamic transport. Here, the authors report experimental evidence for such a coupled electronphonon liquid in NbGe_{2}.
 HungYu Yang
 , Xiaohan Yao
 & Fazel Tafti

Article
 Open AccessQuantum enhanced multiplephase estimation with multimode N00N states
N00N states are a key resource in quantum metrology, but the use of their multimode extension for multiparameter estimation has been elusive so far. Here, the authors use multimode N00N states  with N=2 photons in 4 modes  for multiplephase estimation saturating the quantum CramerRao bound.
 Seongjin Hong
 , Junaid ur Rehman
 & HyangTag Lim

Article
 Open AccessExceptional dynamical quantum phase transitions in periodically driven systems
Understanding phase transitions in systems out of equilibrium is a topic of high interest. Here the author discusses the spontaneous antiunitary symmetry breaking leading to exceptional dynamical quantum phase transitions in driven manybody systems.
 Ryusuke Hamazaki

Article
 Open AccessCarbon clusters formed from shocked benzene
Shockwave driven reactions of organic molecules may have played a key role in prebiotic chemistry, but their mechanisms are difficult to investigate. The authors, using timeresolved xray diffraction and smallangle xray scattering experiments, observe the transformation of liquid benzene during a shock, identifying carbon and hydrocarbon solid products.
 D. M. Dattelbaum
 , E. B. Watkins
 & R. L. Sandberg

Article
 Open AccessTriplon current generation in solids
Triplons are elementary spin excitations characteristic of dimerized magnets, carrying a spin angular momentum one. Here, the authors report evidence for spin current of triplons via thermal transport measurements in a spindimer compound CuGeO_{3}.
 Yao Chen
 , Masahiro Sato
 & Eiji Saitoh

Article
 Open AccessPreliminary demonstration of a persistent Josephson phaseslip memory cell with topological protection
Superconducting computing promises enhanced computational power, but scalable and fast superconducting memories are still not implemented. Here, the authors demonstrate a superconducting memory cell based on hysteretic phaseslip transition, without degradation up to ~1 K over several days.
 Nadia Ligato
 , Elia Strambini
 & Francesco Giazotto

Article
 Open AccessMachine learning dismantling and earlywarning signals of disintegration in complex systems
Network dismantling allows to find minimum set of units attacking which leads to system’s break down. Grassia et al. propose a deeplearning framework for dismantling of large networks which can be used to quantify the vulnerability of networks and detect earlywarning signals of their collapse.
 Marco Grassia
 , Manlio De Domenico
 & Giuseppe Mangioni

Article
 Open AccessSimultaneous bicolor interrogation in thulium optical clock providing very low systematic frequency shifts
There are continuous efforts in improving the stability and systematic shifts of optical clocks. Here the authors demonstrate thulium optical clock utilizing bicolor scheme involving interrogation of both hyperfine levels and they are able to cancel the quadratic Zeeman shift.
 Artem A. Golovizin
 , Dmitry O. Tregubov
 & Nikolai N. Kolachevsky

Article
 Open AccessDeep neural networks using a single neuron: foldedintime architecture using feedbackmodulated delay loops
Development of deep neural networks benefits from new approaches and perspectives. Stelzer et al. propose to fold a deep neural network of arbitrary size into a single neuron with multiple timedelayed feedback loops which is also of relevance for new hardware implementations and applications.
 Florian Stelzer
 , André Röhm
 & Serhiy Yanchuk

Article
 Open AccessObservation of the modification of quantum statistics of plasmonic systems
So far, experimental results have favoured the often unstated assumption that quantum statistical properties of multiparticle systems are preserved in plasmonic platforms. Here, the authors show how multiparticle interference in photonplasmon scattering can modify the excitation mode of plasmonic systems.
 Chenglong You
 , Mingyuan Hong
 & Omar S. MagañaLoaiza

Article
 Open AccessMeasuring dimensionality and purity of highdimensional entangled states
Quantifying dimensionality of highdimensional entangled states is challenging, especially in the presence of mixedness and noise. Here, the authors propose and demonstrate a method to quantify the dimensionality and purity of a biphoton HD entangled state, scaling linearly with entanglement dimension.
 Isaac Nape
 , Valeria RodríguezFajardo
 & Andrew Forbes

Article
 Open AccessEfficient and continuous microwave photoconversion in hybrid cavitysemiconductor nanowire double quantum dot diodes
Efficient conversion of microwave photons into electrical current would enable several applications in quantum technologies, especially if one could step outside of the gatedtime regime. Here, the authors demonstrate continuoustime microwave photoconversion in double quantum dots with 6% efficiency.
 Waqar Khan
 , Patrick P. Potts
 & Ville F. Maisi

Article
 Open AccessSubpicosecond metamagnetic phase transition in FeRh driven by nonequilibrium electron dynamics
In FeRh, it is possible to optically drive a phase transition between ferromagnetic (FM) and antiferromagnetic (AFM) ordering. Here, using a combination of photoelectron spectroscopy and abinitio calculations, the authors demonstrate the existence of a transient intermediate phase, explaining the delayed appearance of the FM phase.
 Federico Pressacco
 , Davide Sangalli
 & Fausto Sirotti

Article
 Open AccessUndecidability in quantum thermalization
The question whether a given isolated quantum manybody system would thermalize has currently no general answer. Here, Shiraishi and Matsumoto demonstrate the computational universality of thermalization phenomena already for simplified 1D systems, thus proving that the thermalization problem is undecidable.
 Naoto Shiraishi
 & Keiji Matsumoto

Article
 Open AccessInertial and viscous flywheel sensing of nanoparticles
Balances for nanoparticles such as resonating fluidfilled cantilevers usually probe only mass through changes in oscillation frequency. Katsikis and Collis et al. tap information from previously ignored rotational motion to simultaneously measure particle mass and volume.
 Georgios Katsikis
 , Jesse F. Collis
 & Scott R. Manalis

Article
 Open AccessRealspace observations of 60nm skyrmion dynamics in an insulating magnet under low heat flow
Skyrmions are a type of topological spin texture that great potential across a wide variety of technological applications. Here, Yu et al. study the thermally driven motion of Skyrmions and find a minimum temperature gradient for the motion of skyrmions two orders of magnitude smaller than for domain walls.
 Xiuzhen Yu
 , Fumitaka Kagawa
 & Yoshinori Tokura

Article
 Open AccessUnveiling the additiveassisted oriented growth of perovskite crystallite for high performance lightemitting diodes
Additives have been widely used for passivating defects in perovskite semiconductors, yet the role of additive and their interaction is not clear. Here, the authors reveal an additiveassisted crystal formation in FAPbI_{3} perovskite by tracking the chemical interaction in the precursor solution and crystallographic evolution using multifunctional additives.
 Lin Zhu
 , Hui Cao
 & Jianpu Wang

Article
 Open AccessSuperconductivity up to 243 K in the yttriumhydrogen system under high pressure
The discovery of high temperature superconductivity in hydrogenrich compounds stimulates further extensive studies. Here, the authors report superconductivity in pressurized yttriumhydrogen system with highest predicted T_{c} among binary compounds.
 Panpan Kong
 , Vasily S. Minkov
 & Mikhail I. Eremets
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