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| Open AccessIntermolecular interactions probed by rotational dynamics in gas-phase clusters
The authors demonstrate, using coincident Coulomb explosion imaging, that the rotational dynamics of single nitrogen molecules can be used as a probe to sense the interactions with surrounding Ar atoms in gas-phase clusters.
- Chenxu Lu
- , Long Xu
- & Jian Wu
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| Open AccessTracking nuclear motion in single-molecule magnets using femtosecond X-ray absorption spectroscopy
The authors use femtosecond K-edge X-ray absorption spectroscopy to follow nuclear motion in a manganese-based tri-nuclear single-molecule magnet, and resolve changes in bond lengths on the order of hundreds of ångströms and on sub-picosecond timescales.
- Kyle Barlow
- , Ryan Phelps
- & J. Olof Johansson
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| Open AccessCoherent electric field control of orbital state of a neutral nitrogen-vacancy center
Color centers in diamond have been proposed as a link between remote superconducting units in hybrid quantum systems, where their orbital degree of freedom is utilized. Here the authors report coherent electric-field control of the orbital state of a neutral NV center in diamond.
- Hodaka Kurokawa
- , Keidai Wakamatsu
- & Hideo Kosaka
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| Open AccessSuppressing dipolar relaxation in thin layers of dysprosium atoms
Confining atoms to lattices can modify their interaction and collision. Here the authors show suppression of dipolar relaxation in the form of reduced decay rate of dysprosium atoms in quasi-2D regime.
- Pierre Barral
- , Michael Cantara
- & Wolfgang Ketterle
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| Open AccessUltrafast photoinduced C-H bond formation from two small inorganic molecules
The formation of C–H bonds via reaction of small inorganic molecules is of great interest for understanding the transition from inorganic to organic matter, but the detailed mechanisms remain elusive. Here, the authors demonstrate real-time visualization and coherent control of the ultrafast C–H bond formation dynamics in a light-induced bimolecular reaction from inorganic species.
- Zhejun Jiang
- , Hao Huang
- & Jian Wu
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| Open AccessRaman time-delay in attosecond transient absorption of strong-field created krypton vacancy
The advent of isolated attosecond XUV pulse sources marks a new era in attosecond science, pivotal for the investigation of core electron dynamics. Here the authors discover that the coherent Raman coupling between the cation states leads to extra timedelay between different transition channels by applying the attosecond transient absorption spectroscopy on the investigation of complex dynamics of strong field ionization of Krypton.
- Li Wang
- , Guangru Bai
- & Zengxiu Zhao
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| Open AccessStrongly interacting Rydberg atoms in synthetic dimensions with a magnetic flux
Weak and non-interacting systems have been previously explored in synthetic dimensions. Here the authors demonstrate strong atomic interaction in synthetic dimensions using an array of Rydberg atoms.
- Tao Chen
- , Chenxi Huang
- & Bryce Gadway
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| Open AccessReshaped three-body interactions and the observation of an Efimov state in the continuum
Efimov states have very weak binding energy and show intriguing characteristics. Here the authors use high-resolution coherent spectroscopy to show the existence of an Efimov state embedded in the atom-dimer continuum for narrow Feshbach resonances in 7Li atoms.
- Yaakov Yudkin
- , Roy Elbaz
- & Lev Khaykovich
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| Open AccessProbing molecules in gas cells of subwavelength thickness with high frequency resolution
Using gas cells for spectroscopic studies opens possibility for miniaturized platforms that can be integrated with other optical components. Here the authors demonstrate molecular rovibrational spectroscopy by confining molecules in a cell of subwavelength thickness.
- Guadalupe Garcia Arellano
- , Joao Carlos de Aquino Carvalho
- & Athanasios Laliotis
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| Open AccessDisentangling the multiorbital contributions of excitons by photoemission exciton tomography
Understanding excitonic optical excitations is integral to improving optoelectronic and photovoltaic semiconductor devices. Here, Bennecke et al. use photoemission exciton tomography to unravel the multiorbital electron and hole contributions of entangled excitonic states in the prototypical organic semiconductor C60.
- Wiebke Bennecke
- , Andreas Windischbacher
- & Stefan Mathias
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| Open AccessLatent ion tracks were finally observed in diamond
While high-energy heavy ions create cylindrical damage zones called ion tracks in many materials, diamond was an exception for a long time. The authors have succeeded in creating the ion tracks in diamond utilizing 2−9MeV C60 fullerene ion irradiation and studied the structure of the tracks.
- H. Amekura
- , A. Chettah
- & Y. Saitoh
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| Open AccessIndication of critical scaling in time during the relaxation of an open quantum system
The dynamics of a quantum system shows interesting features. Here the authors demonstrate critical scaling in the spin relaxation due to spin-exchange process in a system of impurity Cs atoms immersed in Rb atoms.
- Ling-Na Wu
- , Jens Nettersheim
- & Artur Widera
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| Open AccessRobust temporal adiabatic passage with perfect frequency conversion between detuned acoustic cavities
Phase matching is pivotal for realizing complete energy transfer for classical waves. Here, authors propose temporal quasi-phase matching method and realize robust and complete energy transfer between arbitrarily detuned acoustic cavities by combing the concept of stimulated Raman adiabatic passage.
- Zhao-Xian Chen
- , Yu-Gui Peng
- & Yan-Qing Lu
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| Open AccessNon-Abelian Floquet braiding and anomalous Dirac string phase in periodically driven systems
R.-J. Slager et al. extend the theory of multigap topology from static to non-equilibrium systems. They identify Floquet-induced non-Abelian braiding, resulting in a phase characterized by anomalous Euler class, a multi-gap topological invariant. They also find a gapped anomalous Dirac string phase. Both phases have no static counterparts and exhibit distinct boundary signatures.
- Robert-Jan Slager
- , Adrien Bouhon
- & F. Nur Ünal
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| Open AccessCollectively enhanced Ramsey readout by cavity sub- to superradiant transition
One of the ways excited-state atoms relax to ground state is by emitting radiation. Here the authors demonstrate sub- and super-radiant emission threshold from a cavity-mediated atomic ensemble of Sr atoms.
- Eliot A. Bohr
- , Sofus L. Kristensen
- & Jörg H. Müller
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| Open AccessFrom chiral laser pulses to femto- and attosecond electronic chirality flips in achiral molecules
Chirality is a unique property of certain molecules. Here the authors discuss method to induce and flip electronic chirality in oriented NaK molecules using circularly polarized laser pulses.
- Yunjiao Chen
- , Dietrich Haase
- & Yonggang Yang
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Article
| Open AccessSpatiotemporal imaging and shaping of electron wave functions using novel attoclock interferometry
Electrons detached from atoms by photoionization carry valuable information about light-atom interactions. Here, authors propose a novel attoclock interferometry to spatiotemporally shape and image the electron wave function, from which the quantum nature of strong-field ionization is identified.
- Peipei Ge
- , Yankun Dou
- & Yunquan Liu
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Article
| Open AccessCommensurate and incommensurate 1D interacting quantum systems
The authors demonstrate a method controlling the lattice filling of doped 1D Bose-Hubbard system of Rb atoms composed of chains of 3 to 6 sites in an optical lattice. The control is achieved by changing of the light potential and interaction strength.
- Andrea Di Carli
- , Christopher Parsonage
- & Stefan Kuhr
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| Open AccessTowards a transferable fermionic neural wavefunction for molecules
Neural wavefunctions have become a highly accurate approach to solve the Schrödinger equation. Here, the authors propose an approach to optimize for a generalized wavefunction across compounds, which can help developing a foundation wavefunction model.
- Michael Scherbela
- , Leon Gerard
- & Philipp Grohs
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Article
| Open AccessSub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe
Probing molecules in excited vibrational states requires precise methods to extract the spectroscopic parameters. Here the authors demonstrate optical-optical double-resonance spectroscopy of excited-bands of methane using single pass high power continuous wave pump and cavity-enhanced frequency comb probe.
- Vinicius Silva de Oliveira
- , Isak Silander
- & Aleksandra Foltynowicz
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| Open AccessInitial-site characterization of hydrogen migration following strong-field double-ionization of ethanol
Excitation of hydrogen-rich molecules often causes hydrogen migration, but characterisation of the individual sites is challenging. Here, the authors show that measurements of several isotopologues of ethanol can identify each hydrogen site’s contribution to the final products.
- Travis Severt
- , Eleanor Weckwerth
- & Itzik Ben-Itzhak
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| Open AccessExploring the vibrational series of pure trilobite Rydberg molecules
In trilobite Rydberg molecules a ground state atom is coupled to a Rydberg (high-angular momentum) atom, and a potential well is formed in their potential energy curves. Here the authors report observation of vibrational series in pure trilobite rubidium Rydberg molecules created by three-photon photoassociation.
- Max Althön
- , Markus Exner
- & Herwig Ott
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| Open AccessEnhancing the sensitivity of atom-interferometric inertial sensors using robust control
Bringing atom-interferometric quantum sensors out of the lab requires the mitigation of several sources of noise. Here, the authors experimentally demonstrate a software-based mitigation method based on tailored error-robust Bragg light-pulse beamsplitters and mirrors.
- Jack C. Saywell
- , Max S. Carey
- & Michael J. Biercuk
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| Open AccessObservation of frustrated chiral dynamics in an interacting triangular flux ladder
Synthetic gauge field in ultracold atoms provides a controllable platform for the study of quantum many-body physics. Here the authors demonstrate frustrated chiral dynamics in synthetic triangular flux ladder under strong interaction using ultracold Cs atoms.
- Yuqing Li
- , Huiying Du
- & Suotang Jia
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Article
| Open AccessFloquet-tailored Rydberg interactions
Ultracold atoms in arrays represent a useful platform to study quantum processes. Here the authors use Floquet frequency modulation to entangle neutral atoms beyond the usual Rydberg blockade range, protect entangled-state coherence, and realize Rydberg anti-blockade states for two atoms at close range.
- Luheng Zhao
- , Michael Dao Kang Lee
- & Huanqian Loh
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Article
| Open AccessSubcycle surface electron emission driven by strong-field terahertz waveforms
THz-driven electron emission is predicted to yield a single burst, due to the single-cycle waveform. Here, the authors demonstrate the confinement of single-cycle THz-waveform-driven electron emission to one of the two half cycles and the control of the active half cycle by changing the field polarity.
- Shaoxian Li
- , Ashutosh Sharma
- & József A. Fülöp
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Article
| Open AccessAcoustic frequency atomic spin oscillator in the quantum regime
Realising a quantum-backaction-limited oscillator in the acoustic frequency range would have applications in sensing and metrology. Here, the authors reach this goal by demonstrating destructive interference between quantum back-action noise and shot noise down to sub-kHz range in a warm atomic vapor cell.
- Jun Jia
- , Valeriy Novikov
- & Eugene S. Polzik
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Article
| Open AccessMachine learning electronic structure methods based on the one-electron reduced density matrix
Electronic structure methods are vital, yet they are often too computationally expensive. Here, the authors develop machine learned density matrices to fully represent electronic structures in a computationally cheap and accurate way.
- Xuecheng Shao
- , Lukas Paetow
- & Michele Pavanello
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Article
| Open AccessMachine learning assisted vector atomic magnetometry
Multiparameter sensors in quantum optics are often complex due to use of external fields. Here the authors demonstrate a simple single-shot all-optical vector atomic magnetometer based on machine learning for the correspondence of the measured signals and the magnetic field.
- Xin Meng
- , Youwei Zhang
- & Yanhong Xiao
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Article
| Open AccessMultiple-core-hole resonance spectroscopy with ultraintense X-ray pulses
Intense light pulses can create nonlinear ionization processes in atoms and molecules. Here the authors study the photoionization of xenon atoms using intense free-electron laser pulses that can create extremely high charge states and produce hollow atoms, featuring up to six simultaneous core-holes.
- Aljoscha Rörig
- , Sang-Kil Son
- & Rebecca Boll
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| Open AccessEntanglement in the quantum phases of an unfrustrated Rydberg atom array
Rydberg atom arrays are a promising platform for simulating many-body systems. The authors introduce a tensor-network method to compute phase diagrams of infinite arrays with long-range interactions and experimental-scale finite arrays, unveiling a new entangled phase and offering a guide for experiments.
- Matthew J. O’Rourke
- & Garnet Kin-Lic Chan
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Article
| Open AccessDirectly imaging excited state-resolved transient structures of water induced by valence and inner-shell ionisation
Capturing the detailed structural evolution of electronic excited states is a challenging but critical step to understand and control ultrafast molecular dynamics. Here, combining a Coulomb explosion imaging approach and molecular dynamics simulations, the authors retrieve the transient geometry of the ground and excited states of D2O mono- and dication with few femtosecond, few picometre accuracy.
- Zhenzhen Wang
- , Xiaoqing Hu
- & Dajun Ding
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Article
| Open AccessObservation of an Alice ring in a Bose–Einstein condensate
An Alice ring is related to the unusual topology of the monopole field and its decay. Here the authors demonstrate a topological monopole defect in the form of an Alice ring using gaseous Bose–Einstein condensates of 87Rb atoms.
- Alina Blinova
- , Roberto Zamora-Zamora
- & David S. Hall
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Article
| Open AccessCarrier-envelope phase on-chip scanner and control of laser beams
Measurement and control of the carrier-envelope phase (CEP) is essential for applications of few-cycle laser beams. The authors present a compact on-chip, ambient-air, CEP scanning probe and show a 3D map of spatial changes of CEP and demonstrate CEP control in the focal volume with a spatial light modulator.
- Václav Hanus
- , Beatrix Fehér
- & Péter Dombi
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Article
| Open AccessH2 formation via non-Born-Oppenheimer hydrogen migration in photoionized ethane
Uncovering the mechanism behind neutral H2 formation from ionised hydrocarbon molecules still poses severe challenges. Here, based on the orbital fingerprints in the photoelectron momentum distributions, the authors were able to resolve the contributions of the ground and excited ionic states to the H2 formation channel.
- Yizhang Yang
- , Hao Ren
- & Dajun Ding
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Article
| Open AccessA lab-based test of the gravitational redshift with a miniature clock network
Testing general relativity with optical clocks is important both as a fundamental test and for metrological applications. Here, a vertical linear array of 5 separate ensembles of strontium atoms trapped in a single optical lattice is used to perform a blinded lab-based test of the gravitational redshift at the mm to cm scale.
- Xin Zheng
- , Jonathan Dolde
- & Shimon Kolkowitz
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| Open AccessEnhancing reactivity of SiO+ ions by controlled excitation to extreme rotational states
Control of chemical reactivity through excitation of rotational states is a relatively unexplored process that may play a role in interstellar chemistry. Here the authors show a marked acceleration of the hydrogen abstraction reaction between SiO+ and H2 by exciting super-rotor states of SiO+, in a joint experimental and theoretical study.
- Sruthi Venkataramanababu
- , Anyang Li
- & Brian C. Odom
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| Open AccessAttosecond delays between dissociative and non-dissociative ionization of polyatomic molecules
The role of nuclear motion on photoionization delays is an interesting open question. Here the authors study photoionization delays in dissociative and non-dissociative ionization of a polyatomic molecule and explore the effect of isotopic substitution.
- Xiaochun Gong
- , Étienne Plésiat
- & Hans Jakob Wörner
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Article
| Open AccessTwo-dimensional Kβ-Kα fluorescence spectrum by nonlinear resonant inelastic X-ray scattering
X-ray fluorescence spectroscopy is a powerful tool to investigate atomic properties. Here the authors report a two-dimensional fluorescence spectrum of copper metal using X-ray nonlinear scattering and find two-hole satellite feature resulting from atomic transitions.
- Kenji Tamasaku
- , Munetaka Taguchi
- & Tetsuya Ishikawa
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| Open AccessA chip-scale atomic beam clock
Compact atomic clocks and atom interferometers are desired for on-chip integration. Here the authors demonstrate a chip-scale atomic beam of 87Rb atoms and its application as an atomic beam clock
- Gabriela D. Martinez
- , Chao Li
- & William R. McGehee
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Article
| Open AccessDirect observation of coherence transfer and rotational-to-vibrational energy exchange in optically centrifuged CO2 super-rotors
In this work the authors use coherent anti-Stokes Raman scattering to study collisional vibrational excitation in highly rotationally excited CO2 molecules prepared in an optical centrifuge.
- Timothy Y. Chen
- , Scott A. Steinmetz
- & Christopher J. Kliewer
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Article
| Open AccessThermal disruption of a Luttinger liquid
Low-energy excitations of strongly correlated systems are described by the Tomonaga–Luttinger liquid theory. Here the authors employ Bragg spectroscopy to demonstrate a spin-incoherent Luttinger liquid in 6Li atoms using charge and spin excitations.
- Danyel Cavazos-Cavazos
- , Ruwan Senaratne
- & Randall G. Hulet
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Article
| Open AccessPhotonic integrated beam delivery for a rubidium 3D magneto-optical trap
Ultracold atoms are generated in the lab using optical trapping and cooling. Here the authors implement a fiber-coupled photonic integrated circuit for a beam delivery to a three-dimensional magneto-optical trap where greater than 1 million rubidium atoms are cooled near 200 μK.
- Andrei Isichenko
- , Nitesh Chauhan
- & Daniel J. Blumenthal
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| Open AccessMeasurement-induced collective vibrational quantum coherence under spontaneous Raman scattering in a liquid
Spontaneous Raman scattering is classically understood as an incoherent process. Here, the authors demonstrate that macroscopic quantum coherence among billions of vibrating molecules in a liquid is generated when single photon detection and single spatio-temporal mode excitation are implemented.
- Valeria Vento
- , Santiago Tarrago Velez
- & Christophe Galland
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Article
| Open AccessInelastic electron scattering induced quantum coherence in molecular dynamics
Photoabsorption and electron capture are known to induce quantum coherence in molecular dynamics. Here, the authors show that a non-resonant inelastic scattering of incoherent electrons induces such a coherence, which is the most general but hitherto unexplored way of triggering the coherent dynamics in a molecule.
- Akshay Kumar
- , Suvasis Swain
- & Vaibhav S. Prabhudesai
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Article
| Open AccessQuantum dynamical effects of vibrational strong coupling in chemical reactivity
Experiments suggest that placing molecules in an infrared cavity alters their reactivity, an effect lacking a clear theoretical explanation. Here, the authors show that the key to understanding this process may lie in quantum light-matter interactions.
- Lachlan P. Lindoy
- , Arkajit Mandal
- & David R. Reichman
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Article
| Open AccessHigh-order harmonic generation from a thin film crystal perturbed by a quasi-static terahertz field
Here the authors establish a biochromatic method for ultrafast probe and control of the strong field high harmonic generation process in solid by combining strong mid-infrared and weak terahertz fields.
- Sha Li
- , Yaguo Tang
- & Louis F. DiMauro
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Article
| Open AccessFerricyanide photo-aquation pathway revealed by combined femtosecond Kβ main line and valence-to-core x-ray emission spectroscopy
Reliably identifying transient intermediates is crucial to elucidate chemical reaction mechanisms. Here, the authors use femtosecond Fe Kβ main line and valence-to-core x-ray emission spectroscopy to characterize a short-lived intermediate of the aqueous ferricyanide photo-aquation reaction.
- Marco Reinhard
- , Alessandro Gallo
- & Dimosthenis Sokaras
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| Open AccessMany-body bound states and induced interactions of charged impurities in a bosonic bath
Polarons are quasi-particles that emerge when impurity particle is mixed with the low-energy excitations of a medium. Here the authors study the case of atom-ion quantum mixtures and identify three separate bipolaronic regimes which can arise depending on the interaction range and strength.
- Grigory E. Astrakharchik
- , Luis A. Peña Ardila
- & Antonio Negretti