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Article
 Open AccessBireflection of spin waves
Refracting light waves can split at two different angles, a phenomenon called birefringence, whereas for reflected waves the incident and reflected angle are usually the same. Here, using timeresolved magnetooptical microscopy the authors report the bireflection of magnetic spin waves when hybridising with elastic waves.
 Tomosato Hioki
 , Yusuke Hashimoto
 & Eiji Saitoh

Article
 Open AccessSpin–orbit torque nanooscillator with giant magnetoresistance readout
Spinorbit torque driven oscillators, such as spin Hall oscillators, form a class of devices that are intensively studied due to potential practical applications in spintronics. Here, the authors modify the conventional ferromagnetic/nonmagnetic stack to include an additional ferromagnetic layer and leverage the giant magnetoresistance effect to enhance the direct conversion of an inplane driving current into the microwave output signal.
 JenRu Chen
 , Andrew Smith
 , Eric A. Montoya
 , Jia G. Lu
 & Ilya N. Krivorotov

Article
 Open AccessActive magnetocaloric heat pipes provide enhanced specific power of caloric refrigeration
There is an everincreasing requirement for coolant systems and current apparatus typically exhibits low efficiency as well as relying on environmentally detrimental refrigerants. Here, the authors report a design involving a caloric material and the condensation and evaporation of a heat transfer fluid, which achieves a marked increase in performance in comparison to other types of system.
 Lena Maria Maier
 , Patrick Corhan
 , Alexander Barcza
 , Hugo A. Vieyra
 , Christian Vogel
 , Jan D. Koenig
 , Olaf SchäferWelsen
 , Jürgen Wöllenstein
 & Kilian Bartholomé

Article
 Open AccessDynamical decoupling of laser phase noise in compound atomic clocks
Optical clocks have many applications, from improved GNSS measurements to fundamental tests of general relativity, but their frequency stability is limited by quantum noise and the Dick effect. The authors present and demonstrate a method to estimate the phase of an optical clock laser beyond the laser coherence time that can be used to improve the stability of these devices for applications in metrology and the search for new physics.
 Sören Dörscher
 , Ali AlMasoudi
 , Marcin Bober
 , Roman Schwarz
 , Richard Hobson
 , Uwe Sterr
 & Christian Lisdat

Article
 Open AccessAspirationassisted freeform bioprinting of prefabricated tissue spheroids in a yieldstress gel
Controlling the positioning of spheroids in 3D during bioprinting is one of the main challenges hindering the scaffoldfree fabrication of biologicallyrelevant tissues and organs. Here, the authors combine cutting edge aspirationassisted freeform bioprinting of spheroids with selfhealing yieldstress gels, obtaining precise positioning and selfassembly into 3D complex configurations.
 Bugra Ayan
 , Nazmiye Celik
 , Zhifeng Zhang
 , Kui Zhou
 , Myoung Hwan Kim
 , Dishary Banerjee
 , Yang Wu
 , Francesco Costanzo
 & Ibrahim T. Ozbolat

Article
 Open AccessTransversally travelling ultrasound for light guiding deep into scattering media
Optical methods are extensively used for tissue imaging in the biomedical sector but they are limited for deep tissue analysis due to massive losses by strong light scattering, which can be mitigated with the use of ultrasound. The authors present proofofconcept experiments showing transient ultrasound waves transversal to the direction of propagation of laser light that can be used to waveguide in the bulk of the scattering medium to a depth of 90 mean free paths.
 Maxim N. Cherkashin
 , Carsten Brenner
 , Georg Schmitz
 & Martin R. Hofmann

Article
 Open AccessQuantumcritical scale invariance in a transition metal alloy
Extensive theoretical and experimental efforts have been devoted to the effect of quantum criticality in our understanding of the physics of hightemperature superconductors and strongly correlated electron materials, yet it remains a puzzle in condensed matter physics. The authors report observations of a quantum criticality by investigating the nonFermi liquid thermodynamics and transport behaviour in a nonsuperconducting iron pnictide.
 Yasuyuki Nakajima
 , Tristin Metz
 , Christopher Eckberg
 , Kevin Kirshenbaum
 , Alex Hughes
 , Renxiong Wang
 , Limin Wang
 , Shanta R. Saha
 , ILin Liu
 , Nicholas P. Butch
 , Daniel Campbell
 , Yun Suk Eo
 , David Graf
 , Zhonghao Liu
 , Sergey V. Borisenko
 , Peter Y. Zavalij
 & Johnpierre Paglione

Article
 Open AccessFiltering spins by scattering from a lattice of point magnets
Sources of spinpolarized electrons have important applications in various branches of physics. This paper predicts that a 2D lattice of point magnets can act as a spin filter, and so may be employed to deliver spinpolarized currents.
 Areg Ghazaryan
 , Mikhail Lemeshko
 & Artem G. Volosniev

Article
 Open AccessGenerative machine learning for robust freespace communication
In practice, freespace optical communication systems are subjected to atmospheric turbulence in addition to attenuation and noise. Here, the authors develop a combined approach based on generative machine learning and convolutional neural networks, able to correct distortion effects due to turbulence and attenuation.
 Sanjaya Lohani
 , Erin M. Knutson
 & Ryan T. Glasser

Article
 Open AccessParametric dependence of hot electron relaxation timescales on electronelectron and electronphonon interaction strengths
Nonthermal populations of electrons and holes in metals relax via a complex cascade process consisting of multiple scattering mechanisms that are energydependent. This work presents a systematic analysis of relaxation dynamics in different metals based on simple expressions for their timedependent distributions.
 Richard B. Wilson
 & Sinisa Coh

Article
 Open AccessPostmerger chirps from binary black holes as probes of the final blackhole horizon
The formation of a massive black hole (BH) by coalescence of two BHs is a fascinating cosmological event that leaves a gravitational signal that, if detected, can probe extreme gravity and the BH horizon. The authors report nontrivial features of gravitational wave signals from nonequal mass binaries that could be observed by gravitational wave detectors in the coming years, and describe their connection to the evolving shape of the newborn BH.
 Juan Calderon Bustillo
 , Christopher Evans
 , James A. Clark
 , Grace Kim
 , Pablo Laguna
 & Deirdre Shoemaker

Article
 Open AccessOptical frequency metrology in the bending modes region
The lack of widely tunable singlemode lasers in the longwavelength part of the midinfrared region has hindered optical metrology of bending vibrational modes. Here, a continuouswave nonlinear laser source with tunability from 12.1 to 14.8 μm, coupled with a frequency comb, is used to measure bending modes frequencies of carbon dioxide and benzene with accuracy down to 30 kHz.
 M. Lamperti
 , R. Gotti
 , D. Gatti
 , M. K. Shakfa
 , E. Cané
 , F. Tamassia
 , P. Schunemann
 , P. Laporta
 , A. Farooq
 & M. Marangoni

Article
 Open AccessAxon hillock currents enable singleneuronresolved 3D reconstruction using diamond nitrogenvacancy magnetometry
Magnetometry of neural axons has been demonstrated in worms, but it’s application to mammals is more challenging due to the lower signal and connection densities. This work describes how the contribution of axon hillock signatures may be leveraged for simplified experimental 3D reconstruction of mammalian pyramidal neurons with high accuracy.
 Madhur Parashar
 , Kasturi Saha
 & Sharba Bandyopadhyay

Article
 Open AccessUnbiased description of magnetic polarons in a Mott insulator
Polarons are elementary quasiparticles characterizing several interacting manybody quantum systems. The authors present an unbiased Quantum Monte Carlo simulation of a magnetic polaron in a tJ model at lowtemperature, and find excellent agreement with a recent experimental realization in the framework of coldatoms systems.
 Emil Blomquist
 & Johan Carlström

Article
 Open AccessInterplay of filling fraction and coherence in symmetry broken graphene pn junction
Graphene PN junctions are ideal systems to investigate exotic phenomena associated with the quantum Hall effect. Here, the authors carry out conductance and shot noise measurements of a graphene PN junction to investigate the coherence and equilibration dynamics of spinvalley polarized quantum Hall edges.
 Arup Kumar Paul
 , Manas Ranjan Sahu
 , Chandan Kumar
 , Kenji Watanabe
 , Takashi Taniguchi
 & Anindya Das

Article
 Open AccessOxygen sensing ability of positronium atom for tumor hypoxia imaging
There is strong interest in finding way to detect oxygen starved cells with noninvasive methods able to detect small variation on oxygen in living systems for targeted therapy. The authors present a method based on the decay of the positronium generated in the human body during positron emission tomography (PET) with promising application of the PET for positronium imaging
 Kengo Shibuya
 , Haruo Saito
 , Fumihiko Nishikido
 , Miwako Takahashi
 & Taiga Yamaya

Article
 Open AccessTime evolution of transient plasma states from nanowire arrays irradiated at relativistic intensities
Nanowire arrays offer an efficient route to highenergydensity plasma creation, but the hydrodynamical heating process remains uncharacterised. Here, timeresolved xray spectroscopy sheds light on the evolution of the system under relativistic petawatt laser irradiation.
 O. S. Humphries
 , P. Allan
 , C. R. D. Brown
 , L. M. R. Hobbs
 , S. F. James
 , M. G. Ramsay
 , B. Williams
 , D. J. Hoarty
 , M. P. Hill
 & S. M. Vinko

Article
 Open AccessDatadriven prediction and analysis of chaotic origami dynamics
Predicting chaotic behaviour is challenging due to the sensitivity to initial conditions, noise, the environment, and unknown factors. Here, the authors apply quasirecurrent neural networks to predict both periodic and chaotic dynamics of the triangulated cylindrical origami cells, and provide an analysis of the hidden units’ distinctive responses.
 Hiromi Yasuda
 , Koshiro Yamaguchi
 , Yasuhiro Miyazawa
 , Richard Wiebe
 , Jordan R. Raney
 & Jinkyu Yang

Article
 Open AccessCrossdiffusion induced patterns for a singlestep enzymatic reaction
While current mathematical models aim at understanding how enzymes move in fixed substrate gradients, the feedback of the enzymatic reaction on the substrate distribution has not been addressed yet. Here, the authors show that, in the presence of crossdiffusion due to repulsive nonspecific interactions, such feedback can lead to spontaneous spatial pattern formation
 Giovanni Giunta
 , Hamid SeyedAllaei
 & Ulrich Gerland

Article
 Open AccessBidirectional motion of droplets on gradient liquid infused surfaces
Droplet selfpropulsion on surfaces with wetting gradients is relevant for wideranging practical applications, and such motion is typically unidirectional. Here, the authors show how bidirectional motion of droplets can be achieved and controlled on liquidinfused surfaces with texture gradients.
 Muhammad Subkhi Sadullah
 , Gaby Launay
 , Jayne Parle
 , Rodrigo LedesmaAguilar
 , Yonas Gizaw
 , Glen McHale
 , Gary George Wells
 & Halim Kusumaatmaja

Article
 Open AccessUltrathin complex oxide nanomechanical resonators
Thin films of complex oxides can be grown and transferred on substrates, which provides opportunities for their manipulation, characterization and potential applications. Here, the authors fabricate and characterize nanodrum resonators of suspended thin singlecrystal complex oxides and investigate the temperature dependent properties and associated phase transitions of the isolated ultrathin form.
 D. Davidovikj
 , D. J. Groenendijk
 , A. M. R. V. L. Monteiro
 , A. Dijkhoff
 , D. Afanasiev
 , M. Šiškins
 , M. Lee
 , Y. Huang
 , E. van Heumen
 , H. S. J. van der Zant
 , A. D. Caviglia
 & P. G. Steeneken

Article
 Open AccessSurface anchoring controls orientation of a microswimmer in nematic liquid crystal
Interaction of active matter with geometrical constraints is an emerging topic of research due to its potential for design and control of flow patterns. By exploring various modes of swimming and strength of cellliquid crystal interaction, the authors present a computational model of a microswimmer propulsion in a liquid crystal probing a range of nontrivial swimming dynamics.
 Hai Chi
 , Mykhailo Potomkin
 , Lei Zhang
 , Leonid Berlyand
 & Igor S. Aranson

Article
 Open AccessEmergent charge order from correlated electronphonon physics in cuprates
The origin of charge density waves in hightemperature cuprates and its connection with the superconducting state is a longstanding topic of debate. Here, the authors investigate the underlying mechanisms of charge density waves in an underdoped cuprate and describe the relationship with the electronphonon coupling of bondbuckling phonons.
 S. Banerjee
 , W. A. Atkinson
 & A. P. Kampf

Article
 Open AccessMagnondriven dynamics of a hybrid system excited with ultrafast optical pulses
Precision magnetometry has emerged as a sensitive means to probe spin dynamics at a fundamental level. Here, a broadband a photonmagnon hybrid system is demonstrated, capable of detecting quanta of magentisation induced by tiny effective magnetic fields
 N. Crescini
 , C. Braggio
 , G. Carugno
 , R. Di Vora
 , A. Ortolan
 & G. Ruoso

Article
 Open AccessElectronic decoupling of polyacenes from the underlying metal substrate by sp^{3} carbon atoms
Many organic molecules exhibit interesting electronic and magnetic properties, but as they are deposited onto a metallic substrate, their hybridisation often impacts on the observed characteristics. Here, the authors report a method to electronically decouple molecules from the substrate in order to observe the intrinsic physical properties of molecules without interference.
 Mohammed S. G. Mohammed
 , Luciano Colazzo
 , Roberto Robles
 , Ruth Dorel
 , Antonio M. Echavarren
 , Nicolás Lorente
 & Dimas G. de Oteyza

Article
 Open AccessLiving optical random neural network with three dimensional tumor spheroids for cancer morphodynamics
Can living systems function as artificial neural networks for biophysical applications? Here, the authors show that living tumor spheroids can be employed as random optical learning machines and used to investigate cancer morphodynamics and quantify the effect of chemotherapy.
 D. Pierangeli
 , V. Palmieri
 , G. Marcucci
 , C. Moriconi
 , G. Perini
 , M. De Spirito
 , M. Papi
 & C. Conti

Article
 Open AccessWork function seen with submeV precision through laser photoemission
The work function is a fundamental quantity applied to many aspects of physics and describes the minimum energy required to remove an electron from the surface of a metal and eject it into the vacuum. Here, the authors demonstrate a method to determine the work function to five significant figures, a higher order of magnitude than previously reported.
 Y. Ishida
 , J. K. Jung
 , M. S. Kim
 , J. Kwon
 , Y. S. Kim
 , D. Chung
 , I. Song
 , C. Kim
 , T. Otsu
 & Y. Kobayashi

Article
 Open AccessEnergy relaxation pathways between lightmatter states revealed by coherent twodimensional spectroscopy
Recent spectroscopic studies have elucidated lightmatter interactions in excitonpolaritons at room temperature, yet their precise excitedstate dynamics remain unclear. Here, broadband 2D Fourier transform spectroscopy reveals the relaxation between polaritonic states and the role of dark states.
 Lars Mewes
 , Mao Wang
 , Rebecca A. Ingle
 , Karl Börjesson
 & Majed Chergui

Article
 Open AccessNanobenders as efficient piezoelectric actuators for widely tunable nanophotonics at CMOSlevel voltages
The ability to tune nanophotonic components is vital for their incorporation into complex onchip architectures. Here, a fullyintegrated LiNbO_{3} piezoelectric nanobender is presented, providing ~ 5 nm/V and permitting tuning of an optical cavity to a resonance in the infrared.
 Wentao Jiang
 , Felix M. Mayor
 , Rishi N. Patel
 , Timothy P. McKenna
 , Christopher J. Sarabalis
 & Amir H. SafaviNaeini

Article
 Open AccessOptimal number of faces for fast selffolding kirigami
Inspired by the Japanese art of Kirigami, microscopic selffolding structures are gaining interest due to the possible implementation of controlled drug encapsulation and release driven by thermal fluctuations. Here, the authors show that folding time scales can be accurately predicted by mapping the dynamics into a set of competing Brownian processes.
 H. P. M. Melo
 , C. S. Dias
 & N. A. M. Araújo

Article
 Open AccessLongrange nonspreading propagation of sound beam through periodic layered structure
Recently dispersionfree propagation of spatiotemporallymodulated optical pulses over long distances has been demonstrated, but acoustic analogues are less wellexplored. Here, anomalous dispersion and strong anisotropy is demonstrated for the longdistance nonspreading propagation of acoustic waves through an underwater metamaterial.
 Yurii Zubov
 , Bahram DjafariRouhani
 , Yuqi Jin
 , Mathew Sofield
 , Ezekiel Walker
 , Arup Neogi
 & Arkadii Krokhin

Article
 Open AccessTimestretch infrared spectroscopy
Decreasing the acquisition time of spectroscopies permits measurement of dynamic systems to be obtained at increasingly high speeds. Here, a timestretch midinfrared spectrometer is presented, operating at eighty million spectra per second and tested via absorption measurements of two molecular species.
 Akira Kawai
 , Kazuki Hashimoto
 , Tatsuo Dougakiuchi
 , Venkata Ramaiah Badarla
 , Takayuki Imamura
 , Tadataka Edamura
 & Takuro Ideguchi

Article
 Open AccessEdge effects on optically detected magnetic resonance of vacancy defects in hexagonal boron nitride
Crystal defects in 2D materials play an important role in their physical properties and it important to understand the underlying physics to maximise certain characteristics. Here, the authors calculate how point defects in hBN impact on its optical and magnetic properties and the variations which occur due to the location of the defect from bulk to edge.
 A. Sajid
 , Kristian S. Thygesen
 , Jeffrey R. Reimers
 & Michael J. Ford

Article
 Open AccessComplete spatiotemporal and polarization characterization of ultrafast vector beams
While exquisite control over multiple degrees of freedom of laser beams has accelerated the use of vector beams in many areas of research, the ability to simultaneously characterise properties of interest lags behind. Here, full characterisation of spatial and temporal polarization properties of an unknown vector beam is achieved via a hybrid interferometric approach.
 Benjamín Alonso
 , Ignacio LopezQuintas
 , Warein Holgado
 , Rokas Drevinskas
 , Peter G. Kazansky
 , Carlos HernándezGarcía
 & Íñigo J. Sola

Article
 Open AccessOptimized protocol for twinfield quantum key distribution
Quantum key distribution is a method to enable secure communication between two parties and prevent an eavesdropper from stealing information. Here, the authors use twinfield quantum key distribution combined with discrete phase randomisation to improve on the distance at which secure communication can be achieved.
 Rong Wang
 , ZhenQiang Yin
 , FengYu Lu
 , Shuang Wang
 , Wei Chen
 , ChunMei Zhang
 , Wei Huang
 , BingJie Xu
 , GuangCan Guo
 & ZhengFu Han

Article
 Open AccessHighly scalable multicycle THz production with a homemade periodically poled macrocrystal
Multicycle pulsed Terahertz radiation has appealing applications in medicine, applications in medicine, biology, material science, and could power emerging laserbased tabletop accelerators and diagnostics. However a simple way to generate such pulses with high energy is not straightforward. The authors report on generation of highpeakintensity THz pulses using a LithiumNiobate waferchain and achieving a 35 megawatt in peak intensity.
 François Lemery
 , Thomas Vinatier
 , Frank Mayet
 , Ralph Aßmann
 , Elsa Baynard
 , Julien Demailly
 , Ulrich Dorda
 , Bruno Lucas
 , AlokKumar Pandey
 & Moana Pittman

Article
 Open AccessLocalizedtoitinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh_{0.5}Ir_{0.5}In_{5}
A quantum critical point describes a phase transition at zero temperature when an order is suppressed, for instance by application of pressure. Here, the authors investigate the pressure dependence of a heavy fermion antiferromagnet using nuclear quadrupole resonance and reveal two quantum critical points (QCP), among which the first one marks a Fermi surface change and triggers unusual superconducting state.
 Shinji Kawasaki
 , Toshihide Oka
 , Akira Sorime
 , Yuji Kogame
 , Kazuhiro Uemoto
 , Kazuaki Matano
 , Jing Guo
 , Shu Cai
 , Liling Sun
 , John L. Sarrao
 , Joe D. Thompson
 & Guoqing Zheng

Article
 Open AccessUltrafast and anharmonic Rabi oscillations between nonBloch bands
The bulk boundary effects of nonhermitian systems are a burgeoning area of interest with the potential to unveil new and interesting physics. Here, the authors investigate how the nonHermitian skin effect can drastically affect the emission and absorption quanta and Rabi oscillations in a driven nonHermitian twolevel lattice, which is sustainable even the system possess gain or loss.
 Ching Hua Lee
 & Stefano Longhi

Article
 Open AccessRelative importance of nonlinear electronphonon coupling and vertex corrections in the Holstein model
Phonon mediated superconductivity is understood using Migdal’s approximation and models with linear electronphonon coupling, but there are limitations to the information these approximations can provide. Here, the authors investigate the influence of nonlinear electronphonon interactions on the charge density wave and superconducting phases to determine their relevance on the validity of Migdal’s approximation.
 Philip M. Dee
 , Jennifer Coulter
 , Kevin G. Kleiner
 & Steven Johnston

Article
 Open AccessAlloptical supercontinuum switching
Fanout capability, permitting one photon to switch many others, is a crucial ingredient of practical alloptical switching schemes. Exploiting an optical event horizon, high contrast switching is experimentally and theoretically demonstrated with aboveunity fanout.
 Oliver Melchert
 , Carsten Brée
 , Ayhan Tajalli
 , Alexander Pape
 , Rostislav Arkhipov
 , Stephanie Willms
 , Ihar Babushkin
 , Dmitry Skryabin
 , Günter Steinmeyer
 , Uwe Morgner
 & Ayhan Demircan

Article
 Open AccessDirect probe of the interior of an electric pion in a Cooper pair superinsulator
Quarks in the interior of hadrons make up most of ordinary matter, yet their observation is not possible, and their properties can only be probed indirectly. Adopting an analogy between physics of superinsulators and high energy physics, the authors present direct observations of the interior of electric mesons made of Cooper pairs by standard transport measurements.
 M. C. Diamantini
 , S. V. Postolova
 , A. Yu. Mironov
 , L. Gammaitoni
 , C. Strunk
 , C. A. Trugenberger
 & V. M. Vinokur

Article
 Open AccessTopological transitions in superconductor nanomembranes under a strong transport current
Topological defects such as vortices and phase slips in a superconductor system manifest spatial patterns and dynamics that are closely associated with the geometry of the system. Here, the authors investigate the topological transitions between vortexchain and phaseslip transport regimes in curved superconductor nanostructures as a function of an applied magnetic field and how they impact on the magneticfieldvoltage and currentvoltage characteristics.
 R. O. Rezaev
 , E. I. Smirnova
 , O. G. Schmidt
 & V. M. Fomin

Article
 Open AccessDirect observation of timeasymmetric breakdown of the standard adiabaticity around an exceptional point
So far, chiral topological operations around an exceptional point singularity were experimentally observable through the system’s initial and final states only. Here, the authors propose an experimental set up that allows them to access the full timeresolved evolution during encirclinganexceptionalpoint operations.
 Youngsun Choi
 , Jae Woong Yoon
 , Jong Kyun Hong
 , Yeonghwa Ryu
 & Seok Ho Song

Article
 Open AccessQuantum and nonlinear effects in light transmitted through planar atomic arrays
Manybody formalism for light transmission is developed to identify lightinduced quantum effects and entanglement in atomic planar arrays and disks. Outside the regimes of pronounced quantum effects, potent semiclassical models reveal manybody analogues of power broadening and vacuum Rabi splitting.
 Robert J. Bettles
 , Mark D. Lee
 , Simon A. Gardiner
 & Janne Ruostekoski

Article
 Open AccessDeterministic control of an antiferromagnetic spin arrangement using ultrafast optical excitation
Antiferromagnets may hold potential as spintronic devices due to their robustness to external magnetic fields, if a suitable control method is realised. Here, a transient rotation of the global spin arrangement of GdRh_{2}Si_{2} is demonstrated via femtosecond optical excitation.
 Y. W. Windsor
 , A. Ernst
 , K. Kummer
 , K. Kliemt
 , Ch. SchüßlerLangeheine
 , N. Pontius
 , U. Staub
 , E. V. Chulkov
 , C. Krellner
 , D. V. Vyalikh
 & L. Rettig

Article
 Open AccessTwophoton comb with wavelength conversion and 20km distribution for quantum communication
Quantum technologies have seen a remarkable development in recent years and are expected to contribute to quantum internet technologies. The authors present an experimental implementation over commercial telecom fibres of a twophoton comb source for quantum communications with long coherence times and narrow bandwidth, which is used in a 20 km distribution experiment to show the presence of remote twophoton correlations.
 Kazuya Niizeki
 , Daisuke Yoshida
 , Ko Ito
 , Ippei Nakamura
 , Nobuyuki Takei
 , Kotaro Okamura
 , MingYang Zheng
 , XiuPing Xie
 & Tomoyuki Horikiri

Article
 Open AccessDynamical symmetry of strongly lightdriven electronic system in crystalline solids
Floquet engineering describes the control of a quantum system using lightmatter interactions and has received renewed interest due to recent developments in ultrafast spectroscopy techniques. Here, the authors use light scattering spectroscopy to investigate the Floquet state in MoS_{2} and apply dynamical symmetries to understand the polarisation selection rules
 Kohei Nagai
 , Kento Uchida
 , Naotaka Yoshikawa
 , Takahiko Endo
 , Yasumitsu Miyata
 & Koichiro Tanaka

Article
 Open AccessMinimal unlinking pathways as geodesics in knot polynomial space
What makes a given knot's unlinking pathway more likely to appear in certain topological decay processes—from DNA to vortex dynamics? Here, the authors introduce a measure of topological complexity as distance in a suitably defined knot polynomial space, allowing them to quantify the probability of decay pathways as geodesic flows in this space.
 Xin Liu
 , Renzo L. Ricca
 & XinFei Li

Article
 Open AccessA double quantum dot spin valve
Efficient spin injection and detection with a high degree of polarization are fundamental requirements for any potential device relying on the spin degree of freedom rather than electronic charge. Here, the authors use two weakly coupled semiconductor quantum dots as electrically tunable spin injector and detector to achieve extremely large spin polarization controllable by the ferromagnetic splitgates.
 Arunav Bordoloi
 , Valentina Zannier
 , Lucia Sorba
 , Christian Schönenberger
 & Andreas Baumgartner