Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
M. Miskeen Khan, H. Tercas, J. T. Mendonca, J. Wehr, C. Charalambous, M. Lewenstein, M. A. Garcia-March
Summary: The study investigates the quantum motion of an impurity atom in a Bose-Einstein condensate in arbitrary dimensions, showing superdiffusive behavior, dimension-dependent average energy, and non-Markovianity of particle motion. Trapped impurity atoms exhibit stronger position squeezing in lower dimensions.
Article
Optics
A. D. Garcia-Orozco, L. Madeira, M. A. Moreno-Armijos, A. R. Fritsch, P. E. S. Tavares, P. C. M. Castilho, A. Cidrim, G. Roati, V. S. Bagnato
Summary: We studied the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, which was parametrically driven to a turbulent state. We found that the out-of-equilibrium dynamics post excitation can be described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena.
Article
Physics, Multidisciplinary
Sheng-Chang Li
Summary: This paper theoretically studies the tunneling time of a wave packet of Bose-condensed atoms passing through a square barrier. The authors find that the tunneling time shows different scaling laws in different energy regimes. For negative incident energy, the tunneling time decreases rapidly with decreasing incident velocity. In contrast, for positive incident energy smaller than the barrier height, the tunneling time increases slowly and then reaches a maximum, consistent with experimental results from Larmor clock experiments. The effect of barrier width on the maximum tunneling time, related to the uncertainty principle, is also discussed.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Condensed Matter
S. K. Adhikari
Summary: This study investigates supersolid-like states in a quasi-two-dimensional trapped Rashba and Dresselhaus spin-orbit coupled spin-1 condensate. Different types of states are formed depending on the strength of spin-orbit coupling, including superlattice/superstripe states and multi-ring states. These states are found to be dynamically stable and will contribute to a better understanding of crystallization in solids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Multidisciplinary Sciences
Jayanta Bera, Abdul Q. Batin, Suranjana Ghosh, Boris Malomed, Utpal Roy
Summary: This article studies the effects of time-periodic modulation on a quasi-one-dimensional Bose-Einstein condensate with contact and long-range dipolar interactions. The modulation generates a variety of harmonics in the condensate's oscillations, including multiple and combinational harmonics. The results of approximate analytical calculations are confirmed by simulations of the underlying Gross-Pitaevskii equation.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Optics
Anshuman Bhardwaj, Dzmitry Vaido, Daniel E. Sheehy
Summary: This theoretical study examines the dynamics of a Bose-Einstein condensate trapped inside an expanding toroid that mimics an inflationary universe. As the system expands, phonons in the BEC experience redshift and damping, leading to spontaneous particle creation and impacting atom density and density correlations. The predictions and findings in this study provide insights into connections between the dynamics of BEC and inflationary cosmological theories.
Article
Engineering, Mechanical
Emmanuel Kengne
Summary: In this study, we used the similarity transformation technique to build exact and approximate rogue wave (RW) solutions for a quasi-one-dimensional Gross-Pitaevskii equation. These solutions were applied to the study of matter rogue waves and superposed rogue waves in Bose-Einstein condensates (BECs), considering different forms of the interatomic interaction strength. The results show that the solution parameters can be used to control the formation and manipulation of first- and second-order RWs in BEC systems. Additionally, the effects of changing the parameters of the interatomic interaction strength were investigated, revealing the reduction of RWs to single solitons or multiplets. The control and free parameters in the RW solutions were found to influence the splitting of rogue wave components into multi-peak solutions. Furthermore, the linear superposition of different rogue wave solutions resulted in four types of coherent structures, which were analyzed in detail, along with the effects of solution parameters and intra-component strength.
NONLINEAR DYNAMICS
(2023)
Article
Mathematics, Interdisciplinary Applications
Mikhail N. Smolyakov
Summary: In this paper, quantization of a weakly nonideal Bose gas at zero temperature is performed along the lines of the well-known Bogolyubov approach. By introducing nonoscillation modes and calculating nonlinear corrections, the analysis successfully recovers canonical commutation relations and solves the issue of nonconserved particle number at least in the case of free quasi-particles.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Physics, Multidisciplinary
Yaojun Ying, Lizhen Sun, Haibin Li
Summary: The dynamics of Bose-Einstein condensates (BECs) in a single-well potential are investigated using the mode-coupling method. It is found that symmetry plays a crucial role in the coupling between modes. A proper mode-coupling theory of BECs in a single-well potential should include at least four modes. The mode dynamics of non-ideal BECs with interaction exhibit rich behavior, with the combination of nonlinear coupling and initial condition leading to different regimes of mode dynamics.
Article
Physics, Multidisciplinary
Younghoon Lim, Yangheon Lee, Junhong Goo, Dalmin Bae, Y. Shin
Summary: This study experimentally investigated the periodic vortex shedding dynamics in a highly oblate Bose-Einstein condensate. The shedding frequency was found to have a linear relationship with the obstacle velocity, with the proportionality constant decreasing with a decrease in obstacle strength. As the obstacle size increased, both the proportionality constant and critical velocity decreased.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
L. G. F. Soares, F. Haas
Summary: An antiproton plasma confined in a quasi-1D device is described using a variational approach with self-consistent fluid formulation, while retaining thermal and Coulomb effects with the use of time-dependent variational method. Certain assumptions are made for number density and fluid velocity fields, simplifying the problem to ordinary nonlinear differential equations. Numerical simulations of the nonlinear dynamics for realistic parameters are performed, with adiabatic cooling and assumption of adiabatic equation of state for closure.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Multidisciplinary
Timon A. Hilker, Lena H. Dogra, Christoph Eigen, Robert P. Smith, Zoran Hadzibabic
Summary: The two sounds in a highly compressible fluid are investigated using an ultracold Bose gas. The results show that only one sound persists at different temperatures, which is consistent with the hydrodynamic theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Ralf Wanzenboeck, Stefan Donsa, Harald Hofstaetter, Othmar Koch, Peter Schlagheck, Iva Brezinova
Summary: The study investigates the chaos phenomenon in the mean-field limit of a bosonic quantum many-body system, demonstrating that the system rapidly loses coherence with a rate determined by the Lyapunov exponent, which in turn affects the visibility of interference fringes.
Article
Physics, Multidisciplinary
Tobias Kampschulte, Johannes Hecker Denschlag
NEW JOURNAL OF PHYSICS
(2018)
Article
Multidisciplinary Sciences
Daniel K. Hoffmann, Thomas Paintner, Wolfgang Limmer, Dmitry S. Petrov, Johannes Hecker Denschlag
NATURE COMMUNICATIONS
(2018)
Article
Optics
Amir Mohammadi, Joschka Wolf, Artjom Kruekow, Markus Deiss, Johannes Hecker Denschlag
APPLIED PHYSICS B-LASERS AND OPTICS
(2019)
Article
Optics
Limei Wang, Markus Deiss, Georg Raithel, Johannes Hecker Denschlag
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Joschka Wolf, Markus Deiss, Johannes Hecker Denschlag
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
M. Pini, P. Pieri, M. Jaeger, J. Hecker Denschlag, G. Calvanese Strinati
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Multidisciplinary
Amir Mahdian, Artjom Krukow, Johannes Hecker Denschlag
Summary: Collisions with cold particles can dissipate a hot particle's energy and a fast cooling process through resonant conversion has been suggested. Swap cooling and sympathetic cooling show different cooling dynamics, with numerical model calculations supporting the experimental results.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: We explore the physical origin and general validity of a propensity rule for the conservation of hyperfine spin state in three-body recombination. By testing the rule on Rb-85, which has different scattering properties from Rb-87, we observe that the rule also holds for Rb-85. Through experimental observations and theoretical analysis, we gain understanding of the conservation of hyperfine spin state and identify criteria to judge its applicability to other elements and collision channels.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Jinglun Li, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: By conducting experimental and theoretical studies, we have found that the production rate of molecules in the three-body recombination reaction of ultracold Rb decreases with the increase of binding energy Eb, and the formation rate approximately scales as E-alpha b, where alpha is approximately 1. Apart from a possible centrifugal barrier suppression for low binding energies, the formation rate varies only within a factor of two for different rotational angular momenta of the molecular product. We have also proposed a perturbative model to explain the physical origin of the energy scaling of the formation rate and found that the scaling law potentially holds universally for a broad range of interaction potentials.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Multidisciplinary Sciences
Daniel K. Hoffmann, Vijay Pal Singh, Thomas Paintner, Manuel Jaeger, Wolfgang Limmer, Ludwig Mathey, Johannes Hecker Denschlag
Summary: Researchers demonstrate the variation of second sound wave in the crossover from Bose-Einstein condensate to Bardeen-Cooper-Schrieffer superfluid using ultracold fermionic Li-6 atoms with tunable interactions. The speed of second sound varies only slightly in this crossover regime, providing deeper insight into the propagation of sound waves. The measurement results are compared with classical-field simulations to aid in the interpretation of experiments.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Atomic, Molecular & Chemical
Markus Deiss, Shinsuke Haze, Johannes Hecker Denschlag
Summary: This study presents a novel binding mechanism between a neutral Rydberg atom and an atomic ion at a large internuclear distance. It discusses important properties of the long-range atom-ion Rydberg molecule, as well as methods for producing and detecting it. The unusual properties of this molecule offer interesting prospects for studies of wave packet dynamics in engineered potential energy landscapes.
Article
Optics
Jan Schnabel, Tobias Kampschulte, Simon Rupp, Johannes Hecker Denschlag, Andreas Koehn
Summary: Theoretical investigation of photoassociation of Rb-3, focusing on equilibrium structures, spin-orbit effects, and transition dipole moments. Special aspects of trimers including the Jahn-Teller effect are discussed, identifying suitable PA transitions for producing long-lived bound states. Calculations utilize the multireference configuration-interaction method with effective core potential and large basis set.
Article
Physics, Multidisciplinary
Amir Mohammadi, Artjom Kruekow, Amir Mahdian, Markus Deiss, Jesus Perez-Rios, Humberto da Silva, Maurice Raoult, Olivier Dulieu, Johannes Hecker Denschlag
Summary: We investigate the evolution of a cold single BaRb+ molecule during continuous collisions with ultracold Rb atoms, developing methods to discriminate between different ion species, electronic states, and kinetic ion energy ranges. By analyzing experimental data in conjunction with theoretical insights, we achieve a consistent description of the molecule's trajectory through various atomic and molecular states. Monte Carlo simulations accurately describe the measured dynamics, and rates for collisional and radiative relaxation, photodissociation, spin-flip collisions, and chemical reactions are determined as additional results.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Markus Deiss, Shinsuke Haze, Joschka Wolf, Limei Wang, Florian Meinert, Christian Fey, Frederic Hummel, Peter Schmelcher, Johannes Hecker Denschlag
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
Thomas Paintner, Daniel K. Hoffmann, Manuel Jaeger, Wolfgang Limmer, Wladimir Schoch, Benjamin Deissler, Michele Pini, Pierbiagio Pieri, Giancarlo Calvanese Strinati, Cheng Chin, Johannes Hecker Denschlag
