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| 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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Article
| 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
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| Open AccessNuclear quantum effects on zeolite proton hopping kinetics explored with machine learning potentials and path integral molecular dynamics
The quantum properties of hydrogen atoms in zeolite-catalyzed reactions are generally neglected due to high computational costs. Here, the authors leverage machine learning to derive accurate quantum kinetics for proton transfer reactions in heterogeneous catalysis.
- Massimo Bocus
- , Ruben Goeminne
- & Veronique Van Speybroeck
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Article
| Open AccessQuantum Rabi dynamics of trapped atoms far in the deep strong coupling regime
Light interaction with atoms depends on the strength of the light-matter coupling and the energy splitting of the modes involved. Here the authors study of quantum Rabi dynamics in a deep strong coupling regime by using a cloud of cold rubidium atoms.
- Johannes Koch
- , Geram R. Hunanyan
- & Martin Weitz
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Article
| Open AccessInducing transient enantiomeric excess in a molecular quantum racemic mixture with microwave fields
There is growing interest in controlling and manipulating molecules using external field. Here the authors demonstrate microwave induced transient enantiomeric excess in a state-selective benzyl alcohol using microwave six-wave mixing.
- Wenhao Sun
- , Denis S. Tikhonov
- & Melanie Schnell
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| Open AccessA high-fidelity quantum matter-link between ion-trap microchip modules
A possible route to scalability of trapped-ion-based quantum computing platforms is to connect multiple modules where ions can be shuttled across different registers. Here, the authors demonstrate fast and low-loss transfer of trapped ions between two microchip modules.
- M. Akhtar
- , F. Bonus
- & W. K. Hensinger
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Article
| Open AccessA space-based quantum gas laboratory at picokelvin energy scales
Ultracold ensembles are promising sources for precision measurements when their quantum state can precisely be prepared. Here the authors achieve a quantum state engineering of Bose-Einstein condensates in space using NASA’s Cold Atom Lab aboard the International Space Station making a step forward towards space quantum sensing.
- Naceur Gaaloul
- , Matthias Meister
- & Nicholas P. Bigelow
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Article
| Open AccessUltrafast light-induced dynamics in the microsolvated biomolecular indole chromophore with water
Experimentally following the ultrafast dynamics of microsolvated molecules is challenging due to the inherently produced soup mix of various gas-phase aggregates. Here, the authors exploit neutral-species selection to reveal intimate details of the UV-induced ultrafast dynamics in the prototypical indole-water system.
- Jolijn Onvlee
- , Sebastian Trippel
- & Jochen Küpper
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Article
| Open AccessImproved bounds on Lorentz violation from composite pulse Ramsey spectroscopy in a trapped ion
Breaking of Lorentz symmetry is related to the unification of fundamental forces and the extension of the standard model. Here the authors provide updated bounds on the Lorentz violation, by using measurements with trapped Yb+ ion, that represent an improvement over existing results.
- Laura S. Dreissen
- , Chih-Han Yeh
- & Tanja E. Mehlstäubler
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Article
| Open AccessMeasurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium
Muonium is a hydrogen like bound system with a positive muon and an electron. Here the authors measure the Lamb shift and frequency of the transition from 2S1/2, F = 0 state to 2P1/2, F = 1 state in muonium atom and the hyperfine structure of the 2S level.
- Gianluca Janka
- , Ben Ohayon
- & Paolo Crivelli
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Article
| Open AccessObservation of site-selective chemical bond changes via ultrafast chemical shifts
X-ray photoelectron spectroscopy probes the chemical environment in a molecule at a specific atomic site. Here the authors extend this concept with a site selective trigger to follow chemical bond changes as they occur on the femtosecond time scale.
- Andre Al-Haddad
- , Solène Oberli
- & Christoph Bostedt
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Article
| Open AccessControlling Floquet states on ultrashort time scales
Floquet engineering aims at inducing new properties in materials with light. Here the authors have used pulses of variable durations, to investigate its applicability in the femtosecond domain. Surprisingly, they found that it holds to the few-cycle limit.
- Matteo Lucchini
- , Fabio Medeghini
- & Mauro Nisoli
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Article
| Open AccessAbsolute frequency metrology of buffer-gas-cooled molecular spectra at 1 kHz accuracy level
High-resolution molecular spectroscopy with cryogenic setups is hampered by the lack of a skilled interrogation tool. Here, the authors demonstrate absolute metrology of cold rovibrational spectra at 1 kHz accuracy level, by coupling a Lamb-dip saturated-absorption cavity ring-down spectrometer to a buffer-gas cooling source.
- Roberto Aiello
- , Valentina Di Sarno
- & Pasquale Maddaloni
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Article
| Open AccessProbing atomic physics at ultrahigh pressure using laser-driven implosions
Atoms and molecules under extreme temperature and pressure can be investigated using dense plasmas achieved by laser-driven implosion. Here the authors report spectral change of copper in billions atmosphere pressure that can only be explained by a self-consistent approach.
- S. X. Hu
- , David T. Bishel
- & Timothy Walton
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Article
| Open AccessAdsorption energies on transition metal surfaces: towards an accurate and balanced description
Accurately computed chemisorption energies are essential for modeling catalytic conversions in heterogeneous catalysis, but are challenging to obtain. Here authors combine two approaches to improve this situation: standard DFT applied to the extended system, and small cluster models that can be treated with higher-level computational techniques to improve the description of chemical bonding.
- Rafael B. Araujo
- , Gabriel L. S. Rodrigues
- & Lars G. M. Pettersson
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Article
| Open AccessPauli blocking of stimulated emission in a degenerate Fermi gas
Pauli exclusion principle has fundamental and practical consequences to the structure of matter and particle interaction. Here the authors demonstrate Pauli blocking in a coherently driven system using trapped 3He degenerate Fermi gases.
- Raphael Jannin
- , Yuri van der Werf
- & Kjeld S. E. Eikema
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Article
| Open AccessQuantized topological pumping of solitons in nonlinear photonics and ultracold atomic mixtures
Synthetic lattice systems are powerful platforms for studying the influence of intrinsic nonlinearities on topological phenomena. Here the authors elucidate the topological transport of solitons in terms of Wannier functions displacement and they introduce a nonlinearity-induced topological transport effect that could be observed in ultracold quantum mixtures.
- Nader Mostaan
- , Fabian Grusdt
- & Nathan Goldman
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Article
| Open AccessHigh-precision electron affinity of oxygen
High-precision measurements are useful to find isotopic shifts and electron correlation. Here the authors measure electron affinity and hyperfine splitting of atomic oxygen with higher precision than previous studies.
- Moa K. Kristiansson
- , Kiattichart Chartkunchand
- & Dag Hanstorp
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Article
| Open AccessSub-optical-cycle light-matter energy transfer in molecular vibrational spectroscopy
Energy transfer between the electromagnetic field and atoms or molecules is fundamentally interesting. Here the authors demonstrate stepwise energy transfer between broadband mid-infrared optical pulses and vibrating methylsulfonylmethane molecules in aqueous solution.
- Martin T. Peschel
- , Maximilian Högner
- & Ioachim Pupeza
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| Open AccessObservation of Bose-Einstein condensates of excitons in a bulk semiconductor
Bose-Einstein condensate of excitons is expected in photo-excited bulk semiconductors, but a direct experimental evidence has been lacking. Here the authors report the observation of a condensate of 1s paraexcitons in Cu2O using real-space mid-infrared absorption imaging realized in a dilution refrigerator.
- Yusuke Morita
- , Kosuke Yoshioka
- & Makoto Kuwata-Gonokami
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Article
| Open AccessAttosecond dynamics of multi-channel single photon ionization
Understanding of photoionization dynamics, one of the fastest processes in nature, requires the characterization of all underlying ionization channels. Here the authors use an interferometry technique based on attosecond pulses to measure the phase and amplitude of the individual angular momentum channels in the photoionization of neon.
- Jasper Peschel
- , David Busto
- & Per Eng-Johnsson
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Article
| Open AccessStep-by-step state-selective tracking of fragmentation dynamics of water dications by momentum imaging
Determining the time evolution of reactions at the quantum mechanical level improves our understanding of molecular dynamics. Here, authors separate the breakup of water, one bond at a time, from other processes leading to the same final products and experimentally identify, separate, and follow step by step two breakup paths of the transient OD+ fragment.
- Travis Severt
- , Zachary L. Streeter
- & Itzik Ben-Itzhak
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| Open AccessA compact cold-atom interferometer with a high data-rate grating magneto-optical trap and a photonic-integrated-circuit-compatible laser system
Cold-atom interferometers have been miniaturized towards fieldable quantum inertial sensing applications. Here the authors demonstrate a compact cold-atom interferometer using microfabricated gratings and discuss the possible use of photonic integrated circuits for laser systems.
- Jongmin Lee
- , Roger Ding
- & Peter D. D. Schwindt
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Article
| Open AccessAtomic partial wave meter by attosecond coincidence metrology
Understanding the photoelectron emission time after the interaction of photon with atoms and molecules is of fundamental interest. Here the authors examine the role of partial waves to the photoionization phase shift of atoms using an attosecond clock and electron-ion coincidence spectroscopy.
- Wenyu Jiang
- , Gregory S. J. Armstrong
- & Jian Wu
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Article
| Open AccessEntanglement of orbital angular momentum in non-sequential double ionization
In strong field ionization, entanglement between an electron and an ion has been discussed previously. Here the authors explore orbital angular momentum entanglement between the electrons released in non-sequential double ionization.
- Andrew S. Maxwell
- , Lars Bojer Madsen
- & Maciej Lewenstein
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Article
| Open AccessErasure conversion for fault-tolerant quantum computing in alkaline earth Rydberg atom arrays
In quantum computing, realistic error models can allow tailored correction schemes for specific platforms. Here, while considering the case of qubits encoded in metastable electronic levels of atomic arrays, the authors propose a way to convert a large fraction of occurring errors into detectable leakages, or erasure errors, which are vastly easier to correct.
- Yue Wu
- , Shimon Kolkowitz
- & Jeff D. Thompson
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Article
| Open AccessFilming movies of attosecond charge migration in single molecules with high harmonic spectroscopy
Seeing molecules in action under the influence of very short pulses is interesting. Here the authors demonstrate charge migration dynamics in molecules by using high harmonic spectroscopy and machine learning algorithm.
- Lixin He
- , Siqi Sun
- & C. D. Lin
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Article
| Open AccessA non-Hermitian optical atomic mirror
Here the authors provide a theoretical description of non-Hermitian topological phenomena in an atomic mirror. They find out diverse and unexpected phenomena by constructing an ad-hoc theoretical model. In particular, exceptional points, dispersive bulk Fermi arcs, and non-Hermitian geometry-dependent skin effect.
- Yi-Cheng Wang
- , Jhih-Shih You
- & H. H. Jen
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Article
| Open AccessUltraviolet supercontinuum generation driven by ionic coherence in a strong laser field
Supercontinuum generation can be utilized for light source development. Here the authors demonstrate ultraviolet supercontinuum generation from ions due to strong field ionization and multiphoton resonance effect.
- Hongbin Lei
- , Jinping Yao
- & Zengxiu Zhao
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Article
| Open AccessPhotonic-circuited resonance fluorescence of single molecules with an ultrastable lifetime-limited transition
Single molecules can generate high-quality single photons for quantum technologies, but coupling to waveguides is difficult. Here, the authors show on-chip background-free resonance fluorescence generation and routing from single molecules with lifetime-limited transition and waveguide-aligned dipoles.
- Penglong Ren
- , Shangming Wei
- & Xue-Wen Chen
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Article
| Open AccessObservation of supersymmetry and its spontaneous breaking in a trapped ion quantum simulator
Quantum simulators should be able to give insight on exotic physics models such as supersymmetric extensions of Standard Model. Here, the authors demonstrate a first step in this direction, realising a prototypical SUSY model (and spontaneous SUSY breaking within it) using a trapped ion quantum simulator.
- M.-L. Cai
- , Y.-K. Wu
- & L.-M. Duan
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Article
| Open AccessHigh-resolution two-dimensional electronic spectroscopy reveals the homogeneous line profile of chromophores solvated in nanoclusters
Understanding the interaction of single chromophores with nanoparticles remains a challenging task in nanoscience. Here the authors provide insight into the interaction between isolated base-free phthalocyanine molecules and He and Ne nanoclusters in the gas phase using high-resolution two-dimensional spectroscopy.
- Ulrich Bangert
- , Frank Stienkemeier
- & Lukas Bruder
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Article
| Open AccessAssembly and coherent control of a register of nuclear spin qubits
In large qubit registers, long coherence times and individual qubit control are difficult to achieve at the same time. Here, the authors assemble a 2D register of qubits in an array of fermionic alkaline-earth atoms, where tailored pulses can be applied to subsets of individual qubits in parallel.
- Katrina Barnes
- , Peter Battaglino
- & Michael Yarwood
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Article
| Open AccessUltrafast orbital tomography of a pentacene film using time-resolved momentum microscopy at a FEL
Ultrafast pulses are useful to investigate the electron dynamics in excited atoms, molecules and other complex systems. Here, the authors measure transient photoelectron momentum maps following the free-electron laser pulse-induced ionization of a bilayer pentacene thin film on Ag (110) by using time-resolved orbital tomography.
- Kiana Baumgärtner
- , Marvin Reuner
- & Markus Scholz
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| Open AccessUniversality of Dicke superradiance in arrays of quantum emitters
Dicke superradiance is an important collective quantum phenomenon, but its analysis is hindered by the exponential growth of the state space with atom number. Here, the authors develop a theoretical framework that overcomes this, and predict a critical distance below which superradiant decay can be observed in large ordered arrays.
- Stuart J. Masson
- & Ana Asenjo-Garcia
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| Open AccessCurving the space by non-Hermiticity
The understanding and control of non-Hermitian phenomena is becoming every day more important. Here the authors establish the duality between non-Hermiticity and curved spaces. It unfolds a geometric root of non-Hermitian phenomena and provides a study and tailor non-Hermiticity using curved spaces.
- Chenwei Lv
- , Ren Zhang
- & Qi Zhou
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Article
| Open AccessDeep learning enhanced Rydberg multifrequency microwave recognition
Rydberg atoms are sensitive to microwave signals and hence can be used to detect them. Here the authors demonstrate a Rydberg receiver enhanced by deep learning, Rydberg atoms acting as antennae, to receive, extract, and decode the multi-frequency microwave signal effectively.
- Zong-Kai Liu
- , Li-Hua Zhang
- & Bao-Sen Shi
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Article
| Open AccessAmmonia dimer: extremely fluxional but still hydrogen bonded
The long-standing question whether ammonia dimer is hydrogen bonded is solved by first-principles quantum mechanical calculations. The authors show that the dimer is extremely fluxional, but the probability of hydrogen-bonded configurations prevails.
- Jing Aling
- , Krzysztof Szalewicz
- & Ad van der Avoird
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Article
| Open AccessPicosecond pulse-shaping for strong three-dimensional field-free alignment of generic asymmetric-top molecules
Field-free 3D alignment of complex molecules is an important step toward the imaging of molecular dynamics. Here, the authors demonstrate pulse-shaping of long picosecond pulses for the 3D field-free alignment of the prototypical non-rotation-symmetric molecule indole.
- Terry Mullins
- , Evangelos T. Karamatskos
- & Jochen Küpper
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Article
| Open AccessPhotoinduced bond oscillations in ironpentacarbonyl give delayed synchronous bursts of carbonmonoxide release
The photodissociation of transition metal carbonyls is involved in catalysis and synthetic processes. Here the authors, using semi-classical excited state molecular dynamics, observe details of the early stage dynamics in the photodissociation of Fe(CO)5, including synchronous bursts of CO at periodic intervals of 90 femtoseconds.
- Ambar Banerjee
- , Michael R. Coates
- & Michael Odelius
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Article
| Open AccessSelection rules in symmetry-broken systems by symmetries in synthetic dimensions
The authors introduce the concept of real-synthetic symmetries and use it as a tool to derive selection rules in seemingly symmetry-broken strong-field interactions. These symmetries and their corresponding selection rules can be applied in various systems form harmonic generation to topological photonics
- Matan Even Tzur
- , Ofer Neufeld
- & Oren Cohen
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Article
| Open AccessRealizing topological edge states with Rydberg-atom synthetic dimensions
Synthetic dimensions, states of a system engineered to act as if they were a reconfigurable extra spatial dimension, have been demonstrated with different systems previously. Here the authors create a synthetic dimension using Rydberg atoms and configure it to support topological edge states.
- S. K. Kanungo
- , J. D. Whalen
- & T. C. Killian
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Article
| Open AccessAssociative detachment in anion-atom reactions involving a dipole-bound electron
Associative electronic detachment (AED) reactions of anions play a key role in many natural processes. Here, Hassan and colleagues investigate AED reactions between hydroxyl anions and ultracold rubidium atoms in a hybrid atom-ion trap, revealing different dynamics for collisions with ground and electronically excited state rubidium.
- Saba Zia Hassan
- , Jonas Tauch
- & Matthias Weidemüller
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Article
| Open AccessInternal Stark effect of single-molecule fluorescence
The internal Stark effect, a shift of the spectral lines of a chromophore induced by electrostatic fields in its close environment, plays an important role in nature. Here the authors observe a Stark shift in the fluorescence spectrum of a phthalocyanine molecule upon charge modifications within the molecule itself, achieved by sequential removal of the central protons with a STM tip.
- Kirill Vasilev
- , Benjamin Doppagne
- & Guillaume Schull
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Article
| Open AccessFollowing excited-state chemical shifts in molecular ultrafast x-ray photoelectron spectroscopy
Imaging the charge flow in photoexcited molecules would provide key information on photophysical and photochemical processes. Here the authors demonstrate tracking in real time after photoexcitation the change in charge density at a specific site of 2-thiouracil using time-resolved X-ray photoelectron spectroscopy.
- D. Mayer
- , F. Lever
- & M. Gühr
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Article
| Open AccessInfluence of shape resonances on the angular dependence of molecular photoionization delays
It is an interesting topic to find the time it takes for an electron to escape an atom or a molecule after photoionization. Here the authors measure the angular dependence of photoionization time delay in the molecular frame and discuss the role of shape resonances.
- F. Holzmeier
- , J. Joseph
- & R. R. Lucchese
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Article
| Open AccessFano interference in quantum resonances from angle-resolved elastic scattering
Probing resonance features in a scattering process is of fundamental interest. Here the authors discuss the Fano interference due to different angular momentum components in the angle resolved scattering cross section of He*-D2 elastic collisions.
- Prerna Paliwal
- , Alexander Blech
- & Edvardas Narevicius
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Article
| Open AccessGravitational caustics in an atom laser
Previously, the study of caustics has mostly focused on experiments with light. Here, the authors demonstrate gravitational caustics and investigate catastrophe atom optics using the matter waves of an atom laser generated from a Bose-Einstein condensate.
- M. E. Mossman
- , T. M. Bersano
- & P. Engels
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Article
| Open AccessObservation of spin-space quantum transport induced by an atomic quantum point contact
Cold atoms have recently become a versatile platform for the study of quantum transport phenomena. Here the authors realize an alternative experimental scheme for quantum transport with cold atoms, by using spin-dependent impurity scattering in a spinful Fermi gas instead of spatially separated particle distributions.
- Koki Ono
- , Toshiya Higomoto
- & Yoshiro Takahashi