Article
Multidisciplinary Sciences
Thomas Easton, Marios Kokmotos, Giovanni Barontini
Summary: We numerically study the formation of vortex clusters in trapped Bose-Einstein condensates where vortices are initially imprinted in a line. We show that such a system exhibits a rich phenomenology depending on the distance at which the vortices are imprinted and their number. Our work sets the stage for possible experimental implementations where the formation of vortex clusters and more exotic bound states of vortices could be observed.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Rajesh K. Malla
Summary: This study provides a framework for solving generic models that describe the dissociation of multiple molecular Bose-Einstein condensates in a nonadiabatic regime. The competition between individual chemical reactions can lead to nontrivial dependence on critical components, such as path interference and symmetries, which affect the final distribution of atomic population. An analytical solution is obtained for an illustrative example model involving four atomic modes. When the system parameters satisfy CPT symmetry, an exponentially sensitive population imbalance between atomic modes is predicted. However, a weakly broken symmetry can reverse the population imbalance and alter the population in each atomic mode. The solution also demonstrates strong quantum correlation between atomic modes, leading to the spontaneous production of atoms in a multimode squeezed state. Moreover, a time-dependent non-Hermitian quantum mechanics is naturally manifested in this framework, which can be experimentally realized in photonic systems.
Article
Materials Science, Multidisciplinary
K. Orfanakis, A. F. Tzortzakakis, D. Petrosyan, P. G. Savvidis, H. Ohadi
Summary: Researchers observed temporal coherence beyond 1 ns in an optically trapped exciton-polariton condensate, with coherence time more than an order of magnitude longer than an untrapped condensate. This ultralong coherence allows for high-precision spectroscopy of the trapped condensate, where periodic beats of the field correlation function were observed due to fine energy splitting of two polarization modes of the condensate, emphasizing the importance for polariton simulators with spinor condensates in lattice potentials.
Article
Mechanics
Shan Zou, Wen-Kai Bai, Tao Yang, Wu-Ming Liu
Summary: The topological transition of vortex lines to vortex rings and hopfions was numerically investigated in trapped Bose-Einstein condensates. Nearly perfect vortex rings can be obtained by selecting suitable initial separations of vortex lines. The deformation of the formed rings depends on the initial separation of the lines.
Article
Optics
J. D. Topfer, I Chatzopoulos, H. Sigurdsson, T. Cookson, Y. G. Rubo, P. G. Lagoudakis
Summary: Artificial lattices of coherently coupled macroscopic states play a key role in solving complex optimization problems and simulating physical systems. By engineering polariton condensate lattices with active control, researchers have achieved emission close to diffraction limits and significantly improved spatial coherence. This advancement has allowed for a better understanding of the dependence of spatial correlations between polariton condensates on lattice geometry.
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
Materials Science, Multidisciplinary
Jan Wingenbach, Matthias Pukrop, Stefan Schumacher, Xuekai Ma
Summary: The dynamics of phase defects trapped in a finite optically imprinted ring lattice in binary polariton condensates are studied. The Magnus force, spin-orbit interaction, and cross interaction influence the circulation and angular velocity of vortices in the system. These interactions can also lead to elongated and frozen phase defects, triggering the decay of the dark ring solution. The collective motion of multiple vortices is determined by the spin-orbit interaction.
Article
Optics
N. Sanchez-Kuntz, S. Floerchinger
Summary: Investigations into spatial regions within an interacting Bose-Einstein condensate using quantum field theory reveal that small regions relative to the healing length exhibit zero entanglement in the vacuum limit, while larger regions show entanglement entropy akin to that in the vacuum of a relativistic theory.
Editorial Material
Multidisciplinary Sciences
David Lara-Astiaso, Brian J. P. Huntly
Summary: UTX protein regulates chromatin by condensing into liquid-like droplets, thereby suppressing tumor growth.
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)
Review
Biochemistry & Molecular Biology
Wei Wang, Yangnan Gu
Summary: This article summarizes important findings from biomolecular condensate studies related to plant immunity, discussing the role of condensates in coordinating plant immune responses.
Article
Materials Science, Multidisciplinary
Xu Jiang, ChunLei Li, Qiang Han
Summary: This study investigated the influence of polymer volume fraction and amount of crosslinker on the inhomogeneities of linear polymer hydrogel, revealing the generation and variation mechanisms through molecular dynamics simulation. The results showed that an increase in polymer volume fraction and a decrease in amount of crosslinker can increase the spatial inhomogeneity of the hydrogel.
MATERIALS TODAY COMMUNICATIONS
(2022)
Editorial Material
Cell Biology
Elgin Korkmazhan, Peter Tompa, Alexander R. Dunn
Summary: This comment emphasizes the role of partial order in biomolecular condensates, suggesting that ordered interactions between condensate components could be key to the formation and function of a variety of partially ordered macromolecular assemblies.
NATURE REVIEWS MOLECULAR CELL BIOLOGY
(2021)
Article
Physics, Multidisciplinary
H. A. J. Middleton-Spencer, N. G. Parker, L. Galantucci, C. F. Barenghi
Summary: A method to detect the presence and depth of dark solitons in repulsive one-dimensional harmonically trapped Bose-Einstein condensates is presented. The shift of density in Fourier space directly maps onto the depth of the soliton in single soliton systems, and combining spectral methods with imaging techniques allows for determination of soliton characteristics in multi-soliton systems. The detection of solitons by spectral shift is verified to work in the presence of waves induced by density engineering methods, with implications discussed for vortex detection in three-dimensional Bose-Einstein condensates.
Article
Chemistry, Physical
Jiwon Seo, Seungeui Choi, Ravi Singh, Jun -Ho Choi
Summary: We measured the spatial inhomogeneity of constituent molecules in cosolvent-water mixtures using molecular dynamics simulations. The results showed that miscible methanol solutions exhibited homogeneous distribution of components, while immiscible dichloromethane-water mixtures showed localization of components due to the formation of separated liquid phases. In butanol-water mixtures, the h value decreased significantly with increasing temperature, indicating a temperature-dependent phase change from two liquid phases to a single phase. The graph theoretical analysis revealed two prominent types of aggregation behavior: self-associated or spatially extended aggregates, which led to heterogeneous or homogeneous distribution of components, respectively.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Physics, Multidisciplinary
S. S. Hodgman, R. I. Khakimov, R. J. Lewis-Swan, A. G. Truscott, K. V. Kheruntsyan
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
S. A. Simmons, F. A. Bayocboc, J. C. Pillay, D. Colas, I. P. McCulloch, K. Kheruntsyan
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
Kieran F. Thomas, Bryce M. Henson, Yu Wang, Robert J. Lewis-Swan, Karen V. Kheruntsyan, Sean S. Hodgman, Andrew G. Truscott
Summary: We present an experimentally viable approach to demonstrate quantum non-locality in a matter-wave system using a Rarity-Tapster interferometer. The suitability of this method is quantified through theoretical discussion and experimental results. As a proof of concept, we demonstrate an interferometric visibility and Bell parameter between atoms separated by a certain distance, which is important for studying motion degrees of freedom and quantum effects in a gravitationally sensitive system.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Optics
S. A. Simmons, J. C. Pillay, K. V. Kheruntsyan
Summary: This study extends the research on dispersive quantum shock waves in a one-dimensional Bose gas and explores other dynamical scenarios. The results show that both the vacuum point and gray solitons cease to manifest themselves beyond the mean-field approach in the presence of quantum and thermal fluctuations, as well as at intermediate and strong interactions. These findings provide useful insights and perspectives for other physical systems known to display nonlinear wave phenomena.
Article
Physics, Multidisciplinary
R. S. Watson, S. A. Simmons, K. V. Kheruntsyan
Summary: Generalized hydrodynamics (GHD) is a theoretical approach used to characterize non-equilibrium phenomena in integrable and near-integrable quantum many-body systems. In this study, we compare its performance with alternative theoretical methods in describing an interacting one-dimensional Bose gas described by the Lieb-Liniger model. We find that GHD performs well at high temperatures or strong interactions, but for low temperatures and weak interactions, it can still provide a coarse-grained description based on convolution averaging that mimics finite imaging resolution in ultracold atom experiments.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
S. A. Simmons, J. C. Pillay, K. V. Kheruntsyan
Summary: This paper presents a stochastic hydrodynamic method in the positive-P phase-space formalism, which can simulate the full quantum dynamics of interacting Bose gases and compute nonequilibrium quantum correlations. A linearized stochastic hydrodynamic scheme is also derived, which can simulate non-equilibrium situations for a longer time.
Article
Optics
F. A. Bayocboc, M. J. Davis, K. V. Kheruntsyan
Summary: The nonequilibrium dynamics of two tunnel-coupled one-dimensional quasicondensates were studied, revealing the flow of energy from colder to hotter systems in certain parameter regimes and transient damped oscillations during equilibration. The coupled quasicondensates can relax into a final thermal equilibrium state with increased thermal phase coherence length due to phase locking.
Article
Optics
Kieran F. Thomas, Matthew J. Davis, Karen Kheruntsyan
Summary: In this study, the nonequilibrium dynamics of a quantum Newton's cradle in a one-dimensional Bose gas in the weakly interacting quasicondensate regime was investigated. It was found that the system takes a relatively long time to reach thermal equilibrium in this regime compared to the strongly interacting regime.
Article
Optics
Y. Y. Atas, A. Safavi-Naini, K. Kheruntsyan
Article
Optics
R. J. Lewis-Swan, K. Kheruntsyan
Article
Optics
Y. Y. Atas, S. A. Simmons, K. Kheruntsyan
Article
Physics, Multidisciplinary
Jan C. Zill, Tod M. Wright, Karen V. Kheruntsyan, Thomas Gasenzer, Matthew J. Davis
Article
Optics
Y. Y. Atas, I. Bouchoule, D. M. Gangardt, K. V. Kheruntsyan
Article
Optics
Y. Y. Atas, D. M. Gangardt, I. Bouchoule, K. V. Kheruntsyan
Article
Optics
I. Bouchoule, S. S. Szigeti, M. J. Davis, K. V. Kheruntsyan