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| Open AccessQuadrupole anomalous Hall effect in magnetically induced electron nematic state
The anomalous Hall effect in materials with complex magnetic structures has attracted significant research attention. Here the authors report anisotropic anomalous Hall effect in epitaxial NiCo2O4 films attributed to an extended toroidal quadrupole conical magnetic order.
- Hiroki Koizumi
- , Yuichi Yamasaki
- & Hideto Yanagihara
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Article
| Open AccessThe anti-symmetric and anisotropic symmetric exchange interactions between electric dipoles in hafnia
Materials exhibiting anti-symmetric exchange interactions between electric dipoles are rare and the existence of the symmetric exchange interactions remains ambiguous. Here, authors identify hafnia as a candidate hosting such interactions by symmetry analysis and first-principles calculations.
- Longju Yu
- , Hong Jian Zhao
- & Yanming Ma
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Article
| Open AccessTopological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4
W. X. Zhao et al. study the higher-order topological insulator candidate Bi4Br4 by angle-resolved photoemission spectroscopy (ARPES) and ab-initio calculation. They provide strong evidence for the higher-order topological insulator phase, including a signature of the hinge states inside the (100) surface gap.
- Wenxuan Zhao
- , Ming Yang
- & Lexian Yang
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| Open AccessPressure-induced reversal of Peierls-like distortions elicits the polyamorphic transition in GeTe and GeSe
The subtle distortion in atomic structure underlies the drastic changes in the properties of amorphous phase-change materials. Here authors show that that pressure can reverse the Peierls-like distortions introduced by temperature, eliciting a polyamorphic transition in GeTe and GeSe.
- Tomoki Fujita
- , Yuhan Chen
- & Shuai Wei
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Article
| Open AccessTransition between distinct hybrid skyrmion textures through their hexagonal-to-square crystal transformation in a polar magnet
Magnetic skyrmions typically form hexagonal crystals with either uniquely Bloch or Néel-type textures. Here, a polar magnet EuNiGe3 is shown to host two skyrmion crystal phases with hexagonal and square structures, and hybrid Bloch-Néel textures.
- Deepak Singh
- , Yukako Fujishiro
- & Jonathan S. White
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Article
| Open AccessLarge off-diagonal magnetoelectricity in a triangular Co2+-based collinear antiferromagnet
Magnetoelectric coupling, where magnetic and electronic order is linked, allows for the control of magnetism via an electric field and vice versa, potentially offering new approaches to data storage, sensors, actuators and wealth of other devices. Here, using a diverse array of experimental probes, Xu et al show the emergence of both diagonal and off-diagonal magnetoelectric coupling in CoTe6O13.
- Xianghan Xu
- , Yiqing Hao
- & R. J. Cava
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Article
| Open AccessIncommensurate grain-boundary atomic structure
Grain boundary atomic structures of crystalline materials have long been believed to be commensurate with the crystal periodicity of the adjacent crystals. Here, the authors discover an incommensurate grain boundary structure based on direct observations and theoretical calculations.
- Takehito Seki
- , Toshihiro Futazuka
- & Naoya Shibata
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Article
| Open AccessDichotomy of heavy and light pairs of holes in the t−J model
The microscopic mechanism of superconducting pairing in hole-doped cuprates is still debated. Here, using state-of-the-art numerical techniques, the authors examine the properties of pairs of holes in a model relevant to cuprates revealing two types of bound states involving light and heavy hole pairs.
- A. Bohrdt
- , E. Demler
- & F. Grusdt
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Article
| Open AccessGate-tunable anomalous Hall effect in Bernal tetralayer graphene
Intrinsic anomalous Hall effect has been observed in twisted graphene multilayers, but these structures are typically not energetically favorable. This study extends these observations to Bernal-stacked tetralayer graphene, which is the most stable configuration of four-layer graphene.
- Hao Chen
- , Arpit Arora
- & Kian Ping Loh
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Article
| Open AccessCharge-4e superconductivity and chiral metal in 45°-twisted bilayer cuprates and related bilayers
Liu et al. theoretically study maximally-twisted homo-bilayers, such as 45∘-twisted bilayer cuprates and 30∘-twisted bilayer graphene. Through renormalization group and Monte-Carlo calculations, the authors reveal the presence of charge-4e superconductivity and chiral-metal phases in the phase diagram.
- Yu-Bo Liu
- , Jing Zhou
- & Fan Yang
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Article
| Open AccessTwo-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2
Examples of 2D heavy-fermion materials are rare, and the details of their electronic structure have remained elusive. Here, Nakamura et al. report the synthesis and angle-resolved photoemission spectroscopy measurements of a monolayer Kondo lattice, YbCu2, on a Cu(111) surface with an estimated coherence temperature of 30 K.
- Takuto Nakamura
- , Hiroki Sugihara
- & Shin-ichi Kimura
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Article
| Open AccessBolometric detection of Josephson inductance in a highly resistive environment
The predicted dissipative quantum phase transition in a Josephson junction coupled to resistive environment has been examined in recent experiments. In a heat transport experiment, Subero et al. show that the junction acts as an inductor at high frequencies, while DC charge transport confirms insulating behaviour.
- Diego Subero
- , Olivier Maillet
- & Jukka P. Pekola
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Article
| Open AccessHigher-order singularities in phase-tracked electromechanical oscillators
The authors report a controllable third-order cusp singularity in the phase-tracked closed-loop oscillation of two coupled mechanical modes. This finding addresses the challenge of constructing and controlling higher-order singularities.
- Xin Zhou
- , Xingjing Ren
- & Hui Jing
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Article
| Open AccessHigh-throughput ab initio design of atomic interfaces using InterMatch
Predicting properties at the interface of materials is crucial for advanced materials design. Here, the authors introduce a high-throughput computational framework, InterMatch, for predicting several properties of an interface by using the databases of individual bulk materials.
- Eli Gerber
- , Steven B. Torrisi
- & Eun-Ah Kim
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Article
| Open AccessQuantum criticality at cryogenic melting of polar bubble lattices
Quantum effects due to zero-point phonon vibrations are well-explored in bulk ferroelectrics, but little is known about them in ultra-thin films. Luo et al. report atomistic simulations of ultra-thin ferroelectrics, showing that, unlike in bulk, quantum fluctuations stabilize topological structures.
- Wei Luo
- , Alireza Akbarzadeh
- & Laurent Bellaiche
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Article
| Open AccessElectrical detection and modulation of magnetism in a Dy-based ferroelectric single-molecule magnet
The significant magnetoelectric effects in a Dy-based ferroelectric single molecule magnet enable electrical manipulation and detection of resonant quantum tunneling of magnetization.
- Yu-Xia Wang
- , Dan Su
- & Peng Cheng
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Article
| Open AccessHigh-performance van der Waals antiferroelectric CuCrP2S6-based memristors
Layered thio- and seleno-phosphate ferroelectrics show promise for next-generation memory but have thermal stability issues. Using the electric field-driven phase transition in antiferroelectric CuCrP2S6, the authors introduce a robust memristor, emphasizing the potential of van der Waals antiferroelectrics in advanced neuromorphic computing.
- Yinchang Ma
- , Yuan Yan
- & Xixiang Zhang
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| Open AccessCoherent charge oscillations in a bilayer graphene double quantum dot
Graphene quantum dots promise applications for spin and valley qubits; however a demonstration of phase coherent oscillations has been lacking. Here the authors report coherent charge oscillations and measurements of coherence times in highly tuneable double quantum dots in bilayer graphene.
- K. Hecker
- , L. Banszerus
- & C. Stampfer
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| Open AccessCharge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals
Unconventional charge order with chiral response to a magnetic field was observed in kagome metals like KV3Sb5, but the mechanism is not fully understood. Tazai et al. develop a theory based on the bond order fluctuation mechanism and provide a unified view of quantum phases in this material family.
- Rina Tazai
- , Youichi Yamakawa
- & Hiroshi Kontani
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| Open AccessEnhancement of short/medium-range order and thermal conductivity in ultrahard sp3 amorphous carbon by C70 precursor
sp3 amorphous carbon exhibits exceptional mechanical, thermal, and optical properties, but cannot be synthesized using traditional processes. Here authors report a nearly pure sp3−hybridized amorphous carbon synthesized from C70 which shows more short/medium-range order and enhanced thermal conductivity compared to C60.
- Yuchen Shang
- , Mingguang Yao
- & Bingbing Liu
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| Open AccessDiscovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy
Antiferromagnets exhibit high frequency magnons, in the THz regime, a point potentially useful for applications, however, it has meant that detecting spin-fluctuations in antiferromagnets is typically too fast for current experimental approaches. Here Weiss et al use femtosecond noise correlation spectroscopy to observe magnon fluctuations in Sm0.7Er0.3FeO3.
- M. A. Weiss
- , A. Herbst
- & T. Kurihara
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Article
| Open AccessPreferential ice growth on grooved surface for crisscross-aligned graphene aerogel with large negative Poisson’s ratio
Ice formation on grooved surfaces is ubiquitous, but controlling orientation is difficult due to lack of mechanistic insight. Here, the authors observed oriented growth using graphene oxide nanosheets as probes, revealing the effect of groove size, and programmed ice growth to fabricate freeze-cast metamaterials.
- Meng Li
- , Nifang Zhao
- & Hao Bai
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Article
| Open AccessHidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6
Recently, time-reversal symmetry-breaking charge order was demonstrated in the AV3Sb5 (A = K, Rb, Cs) family of kagome superconductors. Here the authors extend this observation to the recently discovered kagome material ScV6Sn6 and discuss differences and similarities to other charge-ordered kagome lattices.
- Z. Guguchia
- , D. J. Gawryluk
- & H. Luetkens
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Article
| Open AccessProgrammable catalysis by support polarization: elucidating and breaking scaling relations
Can support polarisation introduce an extra degree of freedom in catalyst scaling relations? This research considers a computational approach for studying catalysts on polar supports and identifies the origin of broken scaling relations.
- Seongjoo Jung
- , Cristina Pizzolitto
- & Turan Birol
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Article
| Open AccessNon-equilibrium dynamics of spin-lattice coupling
Experimental approaches that can directly measure spin-lattice coupling are rare. Here, authors report direct observation of the coupling of the phonon and magnon dynamics of a coherently driven electromagnon in a multiferroic hexaferrite using time-resolved X-ray diffraction. (277 characters in total).
- Hiroki Ueda
- , Roman Mankowsky
- & Urs Staub
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| Open AccessCryogenic multiplexing using selective area grown nanowires
The authors demonstrate a large ensemble of quantum dots which is characterized using a cryogenic multiplexer-demultiplexer circuit based on selective area growth nanowires, establishing the feasibility of scaling future quantum circuits.
- Dāgs Olšteins
- , Gunjan Nagda
- & Thomas S. Jespersen
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Article
| Open AccessPhonon-enhanced nonlinearities in hexagonal boron nitride
Nonlinear optical processes like higher-order harmonic generation in solids depend on several factors. Here the authors explore the optical nonlinearity of hexagonal boron nitride and find that enhanced nonlinearity is due to electron-phonon and phonon-polariton couplings.
- Jared S. Ginsberg
- , M. Mehdi Jadidi
- & Alexander L. Gaeta
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Article
| Open AccessThermal and electrostatic tuning of surface phonon-polaritons in LaAlO3/SrTiO3 heterostructures
Phonon polaritons are promising for infrared applications while it is difficult to tune the phonon polariton properties. Here, authors report a thermal and electrostatic tuning of surface phonon polaritons in heterostructures of LaAlO3/SrTiO3.
- Yixi Zhou
- , Adrien Waelchli
- & Alexey B. Kuzmenko
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Article
| Open AccessCompeting charge-density wave instabilities in the kagome metal ScV6Sn6
A charge-density wave state was recently reported in the bilayer kagome metal ScV6Sn6, but its nature is debated. Here, using inelastic X-ray scattering, the authors observe two competing charge-density waves and find the ground state is promoted by a momentum-dependent electron-phonon interaction.
- Saizheng Cao
- , Chenchao Xu
- & Yu Song
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Article
| Open AccessA robust and tunable Luttinger liquid in correlated edge of transition-metal second-order topological insulator Ta2Pd3Te5
The interplay of electronic correlations and topology has been a forefront topic in condensed matter physics. Wang et al. present evidence of a correlated topological edge state supporting the Luttinger liquid behaviour in the candidate quadrupole topological insulator Ta2Pd3Te5.
- Anqi Wang
- , Yupeng Li
- & Jie Shen
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Article
| Open AccessPosition error-free control of magnetic domain-wall devices via spin-orbit torque modulation
For magnetic domain-wall devices, key issue to be addressed is nonstochastic displacement of magnetic domain wall. Here, authors report domain-wall control with a position error-free scheme via spin-orbit torque modulation along nanotrack devices.
- Seong-Hyub Lee
- , Myeonghoe Kim
- & Sug-Bong Choe
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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 AccessAtomic scale volume and grain boundary diffusion elucidated by in situ STEM
Here authors explore volume diffusion within crystalline solids at the atomic scale. They use high resolution microscopy techniques to provide insights into the movement of individual atoms within a crystal lattice, revealing the intricate dynamics of volume diffusion processes.
- Peter Schweizer
- , Amit Sharma
- & Xavier Maeder
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| Open AccessAxion insulator state in hundred-nanometer-thick magnetic topological insulator sandwich heterostructures
A zero Hall conductance plateau has been taken as evidence of the axion insulator state in magnetically doped topological insulator heterostructures, but it can also originate from surface state hybridization. Here the authors establish such a state in a ~106 nm thick sample, where hybridization is negligible.
- Deyi Zhuo
- , Zi-Jie Yan
- & Cui-Zu Chang
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Article
| Open AccessMott insulators with boundary zeros
Topological classification of interacting electronic states has emerged as an important topic recently. Wagner at al. show that the momentum structure of the zeros of the electron Green’s function can be used to identify a topological Mott insulator phase, similarly to the single-particle dispersion.
- N. Wagner
- , L. Crippa
- & G. Sangiovanni
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Article
| Open AccessBidirectional light-emitting diode as a visible light source driven by alternating current
The bidirectional light-emitting diode emits visible light regardless of the direction of current flow, leading to AC applications. This is made possible by the use of two oppositely oriented tunnel junctions that surround the active region.
- Mikołaj Żak
- , Grzegorz Muziol
- & Czesław Skierbiszewski
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| Open AccessSimultaneous and independent topological control of identical microparticles in non-periodic energy landscapes
External fields can control the motion of colloidal particles inducing different trajectories depending on for instance the particle size. The authors here use nonperiodic energy landscapes and topological protection to transport a collection of identical colloidal particles simultaneously and independently.
- Nico C. X. Stuhlmüller
- , Farzaneh Farrokhzad
- & Daniel de las Heras
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Article
| Open AccessAnomalous excitonic phase diagram in band-gap-tuned Ta2Ni(Se,S)5
The presence of excitonic instability and its relationship with a structural transition in Ta2NiSe5 has been debated. Chen et al. map out the electronic bands and lattice distortion across the semimetal-to-semiconductor transition with sulfur doping, revealing the crucial role of electron-phonon coupling.
- Cheng Chen
- , Weichen Tang
- & Yu He
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Article
| Open AccessAntiferromagnetic topological insulator with selectively gapped Dirac cones
Antiferromagnetic topological materials have attracted attention recently due to their unique quantum properties and application potential. Here the authors establish an antiferromagnetic topological insulator in NdBi and demonstrate gapped and gapless surface states in two different magnetic domains.
- A. Honma
- , D. Takane
- & T. Sato
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Article
| Open 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 AccessKondo screening in a Majorana metal
The Kondo effect from magnetic impurities has been proposed as a probe of fractionalized excitations in a topological quantum spin liquid. Lee et al. experimentally demonstrate the Kondo effect in a Kitaev candidate material α-RuCl3 with dilute Cr impurities.
- S. Lee
- , Y. S. Choi
- & K.-Y. Choi
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Article
| Open AccessPhase biasing of a Josephson junction using Rashba–Edelstein effect
The authors study transport in Nb-(Pt/Cu)-Nb Josephson junctions (JJ), where Pt/Cu is a Rashba interface. Due to the Rashba–Edelstein effect, a charge current leads to a non-equilibrium spin moment at the Pt/Cu interface, which can be measured from a shift of the Fraunhofer pattern of the JJ.
- Tapas Senapati
- , Ashwin Kumar Karnad
- & Kartik Senapati
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Article
| Open AccessWide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values
The utilization of Mg3(Sb,Bi)2 in thermoelectric devices is hindered by its low performance near room temperature. Here, authors report thermoelectric performance enhancement of Mg3(Sb,Bi)2 within a wide temperature range by incorporating metallic inclusions at grain boundaries. (279 in total)
- Jing-Wei Li
- , Zhijia Han
- & Jing-Feng Li
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Article
| Open AccessEnhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
Strong optical excitation near band extrema can drive novel correlated states. Here the authors report a non-equilibrium many-body state in graphite driven by a strong excitation near van Hove singularity, yielding a tenfold increase in optical conductivity attributed to carrier excitations in the flat bands.
- T. P. H. Sidiropoulos
- , N. Di Palo
- & J. Biegert
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Article
| Open AccessTopotactically transformable antiphase boundaries with enhanced ionic conductivity
Antiphase boundaries (APBs) have been considered major obstacles to optimizing the ionic conductivity of conductors. Here authors reveal that ionic conductivity can be enhanced through engineering APBs by topotactical transformation at the atomic scale.
- Kun Xu
- , Shih-Wei Hung
- & Jing Zhu
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Article
| Open AccessMicroscopic theory of colour in lutetium hydride
Nitrogen-doped lutetium hydride, recently proposed as a superconductor at near-ambient conditions, features distinct color changes from blue to pink to red as a function of pressure. Using theoretical calculations, the authors identify the pink phase as hydrogen-deficient LuH2 and find that this phase is not a phonon-mediated superconductor near room temperature. Further, the color is controlled by the concentration of hydrogen vacancies.
- Sun-Woo Kim
- , Lewis J. Conway
- & Bartomeu Monserrat
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Article
| Open AccessBulk-local-density-of-state correspondence in topological insulators
Current approaches to distinguish topological phases from topologically-trivial phases have limited general applicability. Here, in a photonic-crystal context, the authors demonstrate that in trivial structures the bulk local density of states (LDOS) extends all the way to the edges and corners, while in topological structures the bulk LDOS actually avoids the edges and corners.
- Biye Xie
- , Renwen Huang
- & Shuang Zhang
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Article
| Open AccessMelting and defect transitions in FeO up to pressures of Earth’s core-mantle boundary
Multi-technique synchrotron measurements support the viability of solid FeO-rich structures at Earth’s mantle base. An order-disorder transition identified in the iron defect structure of FeO may lead to unique physical properties in the region.
- Vasilije V. Dobrosavljevic
- , Dongzhou Zhang
- & Jennifer M. Jackson
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Article
| Open AccessEnvironmental memory boosts group formation of clueless individuals
Indirect coordination among individuals through the environment typically requires some basic levels of communication and information processing. Dias et al. introduce a coordination mechanism that emerges in a population of clueless individuals, facilitated by environmental memory, culminating in group formation.
- Cristóvão S. Dias
- , Manish Trivedi
- & Giorgio Volpe
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