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Controlling the magnetic state of the proximate quantum spin liquid α-RuCl_(3) with an optical cavity

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npj Computational Materials 2023年第1期9卷 265-274页

作者： Emil Viñas Boström Adithya Sriram Martin Claassen angel rubio Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 14922761 HamburgGermany Department of Physics Stanford UniversityStanfordCA 94305USA Department of Physics and Astronomy University of PennsylvaniaPhiladelphiaPA 19104USA Center for Computational Quantum Physics Flatiron InstituteSimons FoundationNew York CityNY 10010USA

Harnessing the enhanced light-matter coupling and quantum vacuum fluctuations resulting from mode volume compression in optical cavities is a promising route towards functionalizing quantum materials and realizing exotic states of ***,we extend cavity quantum electrodynamical materials engineering to correlated magnetic systems,by demonstrating that a Fabry-Pérot cavity can be used to control the magnetic state of the proximate quantum spin liquidα-RuCl_(3).Depending on specific cavity properties such as the mode frequency,photon occupation,and strength of the light-matter coupling,any of the magnetic phases supported by the extended Kitaev model can be *** particular,in the THz regime,we show that the cavity vacuum fluctuations alone are sufficient to bringα-RuCl_(3) from a zigzag antiferromagnetic to a ferromagnetic *** external pumping of the cavity in the few photon limit,it is further possible to push the system into the antiferromagnetic Kitaev quantum spin liquid state.

关键词： state quantum magnetic

Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers

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npj Computational Materials 2023年第1期9卷 1959-1968页

作者： Ofer Neufeld Nicolas Tancogne-Dejean Umberto De Giovannini Hannes Hübener angel rubio Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science Hamburg 22761Germany Universitàdegli Studi di Palermo Dipartimento di Fisica e Chimica—Emilio SegrèPalermo I-90123Italy Center for Computational Quantum Physics(CCQ) The Flatiron InstituteNew YorkNY 10010USA

Irradiating solids with ultrashort laser pulses is known to initiate femtosecond timescale magnetization ***,sub-femtosecond spin dynamics have not yet been observed or ***,we explore ultrafast light-driven spin dynamics in a highly nonresonant strong-field *** state-of-the-art ab initio calculations,we predict that a nonmagnetic material can transiently transform into a magnetic one via dynamical extremely nonlinear spin-flipping processes,which occur on attosecond timescales and are mediated by cascaded multi-photon and spin–orbit *** are nonperturbative nonresonant analogs to the inverse Faraday effect,allowing the magnetization to evolve in very high harmonics of the laser frequency(*** up to the 42nd,oscillating at~100 attoseconds),and providing control over the speed of magnetization by tuning the laser power and ***,we show that even for linearly polarized driving,where one does not intuitively expect the onset of an induced magnetization,the magnetization transiently oscillates as the system interacts with *** response is enabled by transverse light-driven currents in the solid,and typically occurs on timescales of~500 attoseconds(with the slower femtosecond response suppressed).An experimental setup capable of measuring these dynamics through pump–probe transient absorption spectroscopy is *** results pave the way for attosecond regimes of manipulation of magnetism.

关键词： tuning transient dynamics

Microscopic theory of light-induced ultrafast skyrmion excitation in transition metal films

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npj Computational Materials 2022年第1期8卷 598-604页

作者： Emil Viñas Boström angel rubio Claudio Verdozzi Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 14922761HamburgGermany Center for Computational Quantum Physics(CCQ) The Flatiron Institute162 Fifth AvenueNew YorkNY10010USA Division of Mathematical Physics and ETSF Lund UniversityPO Box 11822100LundSweden

Magnetic skyrmions are topological excitations of great promise for compact and efficient memory ***,to interface skyrmionics with electronic devices requires efficient and reliable ways of creating and destroying such *** this work,we unravel the microscopic mechanism behind ultrafast skyrmion generation by femtosecond laser pulses in transition metal thin *** employ a theoretical approach based on a two-band electronic model,and show that by exciting the itinerant electronic subsystem with a femtosecond laser ultrafast skyrmion nucleation can occur on a 100 fs *** combining numerical simulations with an analytical treatment of the strong s–d exchange limit,we identify the coupling between electronic currents and the localized d-orbital spins,mediated via Rashba spin–orbit interactions among the itinerant electrons,as the microscopic and central mechanism leading to ultrafast skyrmion *** results show that an explicit treatment of itinerant electron dynamics is crucial to understand optical skyrmion generation.

关键词： excitation transition topological

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进行中的弗洛凯能带工程

Science Bulletin 2023年第8期68卷 751-752页

作者： Hannes Hübener Umberto De Giovannini Shunsuke A.Sato angel rubio Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science Hamburg 22761Germany Universitàdegli Studi di Palermo Dipartimento di Fisica e Chimica—Emilio SegrèPalermo I-90123Italy Center for Computational Sciences University of TsukubaTsukuba 305-8577Japan Center for Computational Quantum Physics(CCQ) The Flatiron InstituteNew York NY 10010USA

In a recent article in Nature,Zhou et al.[1]reported an impressive demonstration of Floquet materials *** this field researchers aim at creating properties in materials that they do not usually exhibit in their equilibrium *** scope ranges from inducing phase transitions in out-of-equilibrium that can otherwise only be achieved by pressure or doping.

关键词：能带工程 equilibrium otherwise

Optimal thermoelectric figure of merit of Si/Ge core-shell nanowires

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纳米研究：英文版 2015年第8期8卷 2611-2619页

作者： Kaike Yang Andres Cantarero angel rubio Roberto D'Agosta Nano-Bio Spectroscopy Group and ETSF Scientific Development Center Departamento de Fisica de Materiales Universidad del Pais Vasco UPV/EHU San Sebastian 20018 Spain Instituto de Ciencia de Materiales Universidad de Valencia Valencia 46071 Spain Ikerbasque Basque foundation for Science Bilbao 48013 Spain

我们调查 Si 和 Ge nanowires 的热电的精力变换效率，并且特别地， Si/Ge 核心壳 nanowires 的。我们显示出 Si 核心 nanowire 上的薄 Ge 壳的存在怎么增加优点的全面数字。我们发现 Ge 壳的最佳的厚度为设备提供优点的最大的数字。我... 详细信息

我们调查 Si 和 Ge nanowires 的热电的精力变换效率，并且特别地， Si/Ge 核心壳 nanowires 的。我们显示出 Si 核心 nanowire 上的薄 Ge 壳的存在怎么增加优点的全面数字。我们发现 Ge 壳的最佳的厚度为设备提供优点的最大的数字。我们也认为 Ge core/Si 是壳 nanowires，并且证明 Si 壳的最佳的厚度不存在，自从优点的数字是 nanowire 的半径的 monotonically 减少的功能。最后，我们验证联系电子精力差距到最大化设备的效率的最佳的工作温度的实验法律。

关键词：热电系数纳米线硅锗核壳能量转换效率单调递减函数最佳工作温度最佳厚度

High-harmonic generation from spin-polarised defects in solids

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npj Computational Materials 2020年第1期6卷 1583-1591页

作者： M.S.Mrudul Nicolas Tancogne-Dejean angel rubio Gopal Dixit Department of Physics Indian Institute of Technology BombayPowaiMumbai 400076India Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 14922761 HamburgGermany Nano-Bio Spectroscopy Group and ETSF Departamento de Fisica de MaterialesUniversidad del País Vasco UPV/EHU20018 San SebastiánSpain

The generation of high-order harmonics in gases enabled to probe the attosecond electron dynamics in atoms and molecules with unprecedented *** these techniques to solids,which were originally developed for atomic and molecular gases,requires a fundamental understanding of the physics that has been partially addressed ***,we employ timedependent density-functional theory to investigate how the electron dynamics resulting in high-harmonic emission in monolayer hexagonal boron nitride is affected by the presence of *** show how these realistic spin-polarised defects modify the harmonic emission and demonstrate that important differences exist between harmonics from a pristine solid and a defected *** particular,we found that the different spin channels are affected differently by the presence of the spin-polarised point ***,the localisation of the wavefunction,the geometry of the defect,and the electron–electron interaction are all crucial ingredients to describe high-harmonic generation in defected solids.

关键词： harmonic solids harmonics

Orbital magneto-optical response of periodic insulators from first principles

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npj Computational Materials 2019年第1期5卷 874-882页

作者： Irina V.Lebedeva David A.Strubbe Ilya V.Tokatly angel rubio Nano-Bio Spectroscopy Group and ETSF Departamento de Física de MaterialesUniversidad del País Vasco UPV/EHU20018 San SebastiánSpain Department of Physics School of Natural SciencesUniversity of CaliforniaMercedCA 95343USA Donostia International Physics Center(DIPC) Manuel de Lardizabal 520018 San SebastiánSpain IKERBASQUE Basque Foundation for Science48011 BilbaoSpain Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science Luruper Chaussee 14922761 HamburgGermany

Magneto-optical response,*** response in the presence of a magnetic field,is commonly used for characterization of materials and in optical ***,quantum mechanical description of electric and magnetic fields in crystals is not straightforward as the position operator is ill *** present a reformulation of the density matrix perturbation theory for time-dependent electromagnetic fields under periodic boundary conditions,which allows us to treat the orbital magneto-optical response of solids at the ab initio *** efficiency of the computational scheme proposed is comparable to standard linearresponse calculations of absorption spectra and the results of tests for molecules and solids agree with the available experimental data.A clear signature of the valley Zeeman effect is revealed in the continuum magneto-optical spectrum of a single layer of hexagonal boron *** present formalism opens the path towards the study of magneto-optical effects in strongly driven low-dimensional systems.

关键词： periodic magneto solids

Plant cell wall-mediated disease resistance:Current understanding and future perspectives

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Molecular Plant 2024年第5期17卷 699-724页

作者： Antonio Molina Lucıa Jorda Miguel angel Torres Marina Martın-Dacal Diego Jose Berlanga Patricia Fernandez-Calvo Elena Gomez-rubio Sonsoles Martın-Santamarıa Centro de Biotecnología y Genómica de Plantas Universidad Politécnica de Madrid(UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria(INIA/CSIC)Campus de Montegancedo UPMPozuelo de Alarcon(Madrid)Spain Departamento de Biotecnologıa-Biología Vegetal Escuela Técnica Superior de Ingenierıa AgronomicaAlimentarıa y de BiosistemasUPMMadridSpain Centro de Investigaciones Biologicas Margarita Salas Consejo Superior de Investigaciones Científicas(CSIC)Ramiro de Maeztu 928040 MadridSpain Misión Biológica de Galicia Consejo Superior de Investigaciones Científicas(CSIC)Campus de Montegancedo UPMPozuelo de Alarcón(Madrid)Spain

Beyond their function as structural barriers,plant cell walls are essential elements for the adaptation of plants to environmental *** walls are dynamic structures whose composition and integrity can be altered in response to environmental challenges and developmental *** wall changes are perceived by plant sensors/receptors to trigger adaptative responses during development and upon stress *** cell wall damage caused by pathogen infection,wounding,or other stresses leads to the release of wall molecules,such as carbohydrates(glycans),that function as damage-associated molecular patterns(DAMPs).DAMPs are perceived by the extracellular ectodomains(ECDs)of pattern recognition receptors(PRRs)to activate pattern-triggered immunity(PTI)and disease ***,glycans released from the walls and extracellular layers of microorganisms interacting with plants are recognized as microbe-associated molecular patterns(MAMPs)by specific ECD-PRRs triggering PTI *** number of oligosaccharides DAMPs/MAMPs identified that are perceived by plants has increased in recent ***,the structural mechanisms underlying glycan recognition by plant PRRs remain ***,this knowledge is mainly focused on receptors of the LysM-PRR family,which are involved in the perception of various molecules,such as chitooligosaccharides from fungi and lipo-chitooligosaccharides(i.e.,Nod/MYC factors from bacteria and mycorrhiza,respectively)that trigger differential physiological ***,additional families of plant PRRs have recently been implicated in oligosaccharide/polysaccharide *** include receptor kinases(RKs)with leucine-rich repeat and Malectin domains in their ECDs(LRR-MAL RKs),Catharanthus roseus RECEPTOR-LIKE KINASE 1-LIKE group(CrRLK1L)with Malectin-like domains in their ECDs,as well as wall-associated kinases,lectin-RKs,and *** characterization of structural basis of glycans recogniti

关键词： Arabidopsis thaliana cell wall damage-associated molecular patterns DAMPs disease resistance glycans oligosaccharides pattern-triggered immunity PTl pattern recognition receptor PRRs

Dynamical amplification of electric polarization through nonlinear phononics in 2D SnTe

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npj Computational Materials 2020年第1期6卷 155-162页

作者： Dongbin Shin Shunsuke A.Sato Hannes Hübener Umberto De Giovannini Noejung Park angel rubio Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science Luruper Chaussee 149Hamburg 22761Germany Center for Computational Sciences University of TsukubaTsukuba 305-8577Japan Nano-Bio Spectroscopy Group Departamento de Fisica de MaterialesUniversidad del Pas VascoSan Sebastian 20018Spain Department of Physics Ulsan National Institute of Science and TechnologyUNIST-gil 50Ulsan 44919Korea Center for Computational Quantum Physics(CCQ) The Flatiron Institute162 Fifth AvenueNew YorkNY 10010USA

Ultrafast optical control of ferroelectricity using intense terahertz fields has attracted significant *** we show that the nonlinear interactions between two optical phonons in SnTe,a two-dimensional in-plane ferroelectric material,enables a dynamical amplification of the electric polarization within subpicoseconds time *** first-principles time-dependent simulations show that the infrared-active out-of-plane phonon mode,pumped to nonlinear regimes,spontaneously generates in-plane motions,leading to rectified oscillations in the in-plane electric *** suggest that this dynamical control of ferroelectric material,by nonlinear phonon excitation,can be utilized to achieve ultrafast control of the photovoltaic or other nonlinear optical responses.

关键词： nonlinear ferroelectric phonon