Ultracold gases articles within Nature Communications

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  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    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

  • Article
    | Open Access

    A general theory for Floquet topology applicable to all crystalline symmetry groups is lacking. Here, the authors propose such a theory for noninteracting Floquet crystals and predict an inversion-protected Floquet higher-order topological phase with anomalous chiral hinge modes.

    • Jiabin Yu
    • , Rui-Xing Zhang
    •  & Zhi-Da Song

  • Article
    | Open Access

    Non-equilibrium Bose-Einstein condensates exist in different systems like polaritons, photons. Here the authors demonstrate photonic BECs in an excited or a non-equilibrium state and explore the flow of the photons coupled to the interferometer in order to minimize the loss.

    • Mario Vretenar
    • , Chris Toebes
    •  & Jan Klaers

  • Article
    | Open Access

    It was predicted that complex thermalizing behaviour can arise in many-body systems in the absence of disorder. Here, the authors observe non-ergodic dynamics in a tilted optical lattice that is distinct from previously studied regimes, and propose a microscopic mechanism that is due to emergent kinetic constrains.

    • Sebastian Scherg
    • , Thomas Kohlert
    •  & Monika Aidelsburger

  • Article
    | Open Access

    Physical principles underlying machine learning analysis of quantum gas microscopy data are not well understood. Here the authors develop a neural network based approach to classify image data in terms of multi-site correlation functions and reveal the role of fourth-order correlations in the Fermi-Hubbard model.

    • Cole Miles
    • , Annabelle Bohrdt
    •  & Eun-Ah Kim

  • Article
    | Open Access

    Atom interferometers can be useful for precision measurement of fundamental constants and sensors of different type. Here the authors demonstrate a compact twin-lattice atom interferometry exploiting Bose-Einstein condensates (BECs) of 87 Rb atoms.

    • Martina Gebbe
    • , Jan-Niclas Siemß
    •  & Ernst M. Rasel

  • Article
    | Open Access

    Designing reliable nanoscale quantum-heat engines achieving high efficiency, high power and high stability is of fundamental and practical interest. Here, the authors report the realization of such a quantum machine using individual neutral Cs atoms in an atomic Rb bath, in which quantized heat exchange via inelastic spin-exchange collisions is controlled at the level of single quanta.

    • Quentin Bouton
    • , Jens Nettersheim
    •  & Artur Widera

  • Article
    | Open Access

    The detection of the effects of spin symmetry in momentum distribution of an SU(N)-symmetric Fermi gas has remained challenging. Here, the authors use supervised machine learning to connect the spin multiplicity to thermodynamic quantities associated with different parts of the momentum distribution.

    • Entong Zhao
    • , Jeongwon Lee
    •  & Gyu-Boong Jo

  • Article
    | Open Access

    Here the authors use Ramsey interferometry to study Tan’s contact in uniform two-dimensional Bose gas of 87Rb atoms across the Berezinskii–Kosterlitz–Thouless superfluid transition. They find that the two-body contact is continuous across the critical point.

    • Y.-Q. Zou
    • , B. Bakkali-Hassani
    •  & J. Beugnon

  • Article
    | Open Access

    Here the authors report on the creation of ultracold plasma by photoionization of a Bose-Einstein condensate with a femtosecond laser pulse. The experimental setup grants direct access to the electron temperature and reveals ultrafast cooling of electrons in an initially strongly coupled plasma.

    • Tobias Kroker
    • , Mario Großmann
    •  & Juliette Simonet

  • Article
    | Open Access

    The emergent excitation dynamics of an ultracold gas of Rydberg atoms exhibits features analogous to epidemic spreading on networks. Wintermantel et al. propose a controllable experimental system for studying network dynamics at the interface of mathematical models and real-world complex systems.

    • T. M. Wintermantel
    • , M. Buchhold
    •  & S. Whitlock

  • Article
    | Open Access

    Bloch oscillations (BO) are intrinsically related to the geometry and topological properties of the underlying band structure. Here, Di Liberto et al. predict a unique topological effect manifested in the BOs of higher-order topological insulators through the interplay of non-Abelian Berry curvature and quantized Wilson loops.

    • M. Di Liberto
    • , N. Goldman
    •  & G. Palumbo

  • Article
    | Open Access

    To design and manipulate qubits, it is necessary to engineer multidimensional non-equilibrium steady states immune to decoherence in an open system. Here the authors devise a symmetry-based framework to create such non-equilibrium steady states showing characteristics of degenerate vacua of a unitary topological system.

    • Raul A. Santos
    • , Fernando Iemini
    •  & Yuval Gefen

  • Article
    | Open Access

    Quantum interference of currents was first observed in a superconducting quantum interference device (SQUID). Here, the authors demonstrate quantum interference of currents in the atomtronic analog of a SQUID using Bose-Einstein condensates of 87Rb atoms.

    • C. Ryu
    • , E. C. Samson
    •  & M. G. Boshier

  • Article
    | Open Access

    Atom-photon interaction and their coupling are important to understand correlated and quantum matter. Here the authors show strong coupling between degenerate interacting Fermi gas of 6Li atoms and photons.

    • Kevin Roux
    • , Hideki Konishi
    •  & Jean-Philippe Brantut

  • Article
    | Open Access

    In spatial adiabatic passage, matter wave is transported between states without populating the intermediate quantum state. Here the authors demonstrate the spatial adiabatic passage using ultracold 171Yb atoms in Lieb-type optical lattices.

    • Shintaro Taie
    • , Tomohiro Ichinose
    •  & Yoshiro Takahashi

  • Article
    | Open Access

    Topological defects and textures are universal phenomena across physics. The authors demonstrate that an initial non-singular spinor texture can be controllably transformed into a pair of singular vortices with cores filled by atoms that continuously connect distinct magnetic phases of matter.

    • L. S. Weiss
    • , M. O. Borgh
    •  & D. S. Hall

  • Article
    | Open Access

    Entangled particles some distance apart can be used to show the strikingly nonlocal nature of quantum mechanics. Here the authors generate spatially separated pairs of helium atoms by colliding Bose-Einstein condensates and show that they are entangled by observing nonlocal correlations.

    • D. K. Shin
    • , B. M. Henson
    •  & A. G. Truscott

  • Article
    | Open Access

    For use in electronic and quantum applications, controlling the magnetism of a system through non-magnetic means is important. Here, the authors demonstrate a unidirectional non-magnetic spin-switch device using spin-momentum coupling in Bose–Einstein condensates of ultracold Rb-87 atoms.

    • Maren E. Mossman
    • , Junpeng Hou
    •  & Peter Engels

  • Article
    | Open Access

    Ultracold polar molecules are an excellent platform for quantum science but experiments so far see fast trap losses that are poorly understood. Here the authors investigate collisional losses of nonreactive RbCs, and show they are consistent with the sticky collision hypothesis, but are slower than the universal rate.

    • Philip D. Gregory
    • , Matthew D. Frye
    •  & Simon L. Cornish

  • Article
    | Open Access

    Spin-changing atomic collisions are important for thermally robust entanglement generation with applications in quantum information. Here the authors demonstrate record high spin state correlations and long spin relaxation times in the collision of two Rb atoms at relatively warm temperatures.

    • Pimonpan Sompet
    • , Stuart S. Szigeti
    •  & Mikkel F. Andersen

  • Article
    | Open Access

    There is growing interest in hybrid atom-nanophotonic systems for quantum optics and quantum many-body simulations. Here, the authors demonstrate trapping, fluorescence imaging and optical conveyor belt transport of cold atoms on a planar nanophotonic surface using configurable optical tweezers.

    • May E. Kim
    • , Tzu-Han Chang
    •  & Chen-Lung Hung

  • Article
    | Open Access

    The origin of bad-metal resistivity is a long-standing problem for condensed matter physics. Here the authors show anomalous resistivity, transport lifetime, and relaxation dynamics consistent with bad-metal behavior over a wide range of temperature for fermionic potassium atoms in optical lattices.

    • W. Xu
    • , W. R. McGehee
    •  & B. DeMarco

  • Article
    | Open Access

    Order parameter and phase characterization of multicomponent quantum system is of fundamental importance. Here the authors show the parameter control of the dynamics and relaxation of the magnetic ordering of the spin-1 Bose-Einstein condensates of sodium atoms in uniform magnetic field.

    • K. Jiménez-García
    • , A. Invernizzi
    •  & F. Gerbier

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