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
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
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
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
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
Optics
Yuhang Nie, Jun-Hui Zheng, Tao Yang
Summary: In this article, we investigate the Bogoliubov excitation spectrum of quantum droplets in an optical lattice and classify the collective excitations into different modes. The oscillation frequencies and phononic modes of the droplets are measured through experimental measurements. Furthermore, the instability caused by density fluctuations and the critical filling of atoms are discussed. This work is essential for understanding the superfluid nature of quantum droplets in an optical lattice.
Article
Optics
Boyao Li, Xingjie Wang, Yaoyao Liang, Jinghua Sun, Sufang Zhu, Xiaoyong Chen, Guiyao Zhou
Summary: This study reports the generation of vectorial solitons in a single cavity induced by dual-core fiber assisted ultrafast fiber lasers. It was found that four-component polarized rotation vector solitons (PRVS) are generated using the dispersive Fourier transformation technique. Furthermore, by controlling the soliton phase offset in dual-core fiber, the soliton rain state of multi pulse evolution can be obtained.
OPTICS AND LASER TECHNOLOGY
(2023)
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
Optics
Jacek Dobrzyniecki, Tomasz Sowinski
Summary: This study provides a comprehensive analysis of the dynamics of two Rydberg-dressed particles tunneling from a potential well into open space. It demonstrates that the dominant decay mechanism switches from sequential tunneling to pair tunneling when the interaction strength is tuned below a certain critical value. By comparing the dynamics of bosons and fermions, the study reveals significant differences between the two cases, especially in terms of how increasing the interaction range affects the tunneling rate.
Article
Multidisciplinary Sciences
Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell
Summary: We present a magnetic sensor with extremely high energy resolution, applied in the detection of Rb-87 single-domain spinor Bose-Einstein condensates. By utilizing nondestructive Faraday rotation probing, we have achieved a low-frequency magnetic sensitivity of 72(8) fT, and measured the volume, spin coherence time, and readout noise of the condensate experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
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
Materials Science, Multidisciplinary
Jingjing Jin, Wei Han, Huifang Zhao, Wenyuan Liu
Summary: This study investigates the Moire superlattice structures generated by the interplay between vortex lattice and optical lattice in two-component Bose-Einstein condensates. The possible superlattice patterns under different twist angles are studied, as well as the relative shift of the Moire superlattices in two components of the condensates.
RESULTS IN PHYSICS
(2022)
Article
Optics
Moritz Drescher, Manfred Salmhofer, Tilman Enss
Summary: In this study, we investigate the mutual interaction between two heavy particles immersed in a three-dimensional Bose-Einstein condensate and its correlation with excitations of the medium. For an ideal Bose gas, the induced interaction follows Newtonian mechanics with a shift in distance that depends on the coupling strength between impurities and bosons. However, for a real Bose-Einstein condensate, we find that the induced potential is dominated by three-body physics of a single boson bound to the impurities at short distances, resulting in an Efimov potential. At large distances of the order of the healing length, a Yukawa potential emerges instead. We demonstrate that both regimes can be realized for all impurity-boson couplings and determine the corresponding crossover scales. Additionally, we investigate the transition from the real to the ideal condensate at low gas parameters.
Article
Astronomy & Astrophysics
Marko Gacesa, R. J. Lillis, K. J. Zahnle
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Physics, Multidisciplinary
Jia Wang, Peter Hannaford, Bryan J. Dalton
Summary: A fully comprehensive multi-mode quantum treatment based on truncated Wigner approximation (TWA) was used to study many-body effects and quantum fluctuations on the formation of a discrete time crystal (DTC) in a Bose-Einstein condensate (BEC) bouncing on a periodically driven atom mirror. The study showed that TWA approach can provide accurate predictions and observed the possibility of creating a stable DTC based on repulsive interactions. Additionally, the dynamical behavior of the system was found to be largely independent of whether the boson-boson interaction is attractive or repulsive, indicating the robustness of the system.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jia Wang, Xia-Ji Liu, Hui Hu
Summary: In this study, we investigate a heavy impurity immersed in an interacting Fermi superfluid using the exact functional determinant approach. We analyze the impact of the pairing gap on the properties of quasiparticles revealed by two spectroscopies. The results show interesting phenomena, such as dark continuum, molecule-hole continuum, and repulsive polaron, depending on the scattering conditions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Sanchit Chhabra, Marko Gacesa, Malathe S. Khalil, Amal Al Ghaferi, Nayla El-Kork
Summary: In this study, the total and differential cross sections of fast O(P-3) atom collisions with CO were calculated using quantum mechanical calculations. The effects of energy relaxation on the isotopes of O atoms were compared. These results will be useful for improving the modeling of escape and energy transfer processes in the Mars' upper atmosphere.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Business, Finance
Fang Wang, Marko Gacesa
Summary: This study extends previous research on the Efficient-Market Hypothesis in the Bitcoin market by analyzing 28,739,514 qualified tweets related to Bitcoin over a five-year period. Unlike previous studies, fundamental keywords were used as an informative proxy instead of sentiment analysis, information volume, or price data. Various machine learning methods and textual analyses were employed to examine market efficiency in different time periods. The findings suggest that a significant portion of market movements can be attributed to public information within organic tweets.
INTERNATIONAL REVIEW OF FINANCIAL ANALYSIS
(2023)
Article
Optics
Jia Wang
Summary: We investigated a system where a heavy impurity is immersed in a degenerate Fermi gas and its internal degree of freedom is manipulated by a series of radio-frequency pulses. Using the functional determinant approach, we calculated the precise Ramsey-interference-type responses to these pulses, which can be regarded as multidimensional spectroscopy of the system in the time domain. Fourier transforming the time intervals gave the multidimensional spectroscopy in the frequency domain, providing valuable insights into many-body correlation and relaxation.
Article
Chemistry, Physical
Aasif A. Dabbawala, Omer Elmutasim, Mark A. Baker, Georgios Siakavelas, Dalaver H. Anjum, Nikolaos D. Charisiou, Steven J. Hinder, Catherine J. Munro, Marko Gacesa, Maria A. Goula, Kyriaki Polychronopoulou
Summary: In this study, monometallic and bimetallic composite catalysts were synthesized and thoroughly characterized. The results showed that these composites exhibited excellent catalytic performance and stability, achieving good results in hydrodeoxygenation reactions.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yosra Ajili, Ernesto Quintas-Sanchez, Bilel Mehnen, Piotr S. Zuchowski, Filip Brzek, Nayla El-Kork, Marko Gacesa, Richard Dawes, Majdi Hochlaf
Summary: A 4D-PES of the carbon dioxide-oxygen molecule complex was mapped using ab initio calculations. The most stable and transition structures were predicted, and comparisons with other complexes were made. The induced shifts of CO2 and O-2 were discussed, and the second virial coefficient was computed. The results showed close agreement with experiments, highlighting the importance of a full description of the potential for accurate thermophysical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Jia Wang, Xia-Ji Liu, Hui Hu
Summary: In this study, we investigate a system of a heavy impurity embedded in a paired two-component Fermi gas. By extending the functional determinant approach, we are able to understand the polaron physics in the system, including the effects of the pairing gap in the BCS superfluid.
Article
Optics
Hui Hu, Jia Wang, Jing Zhou, Xia-Ji Liu
Summary: This paper investigates the zero-temperature quasiparticle properties of a mobile impurity in a strongly interacting Fermi superfluid. It shows that the repulsive polaron branch becomes less well defined due to the existence of a significant pairing gap Delta, while the attractive polaron branch becomes more robust at finite momentum.
Article
Optics
Jia Wang, Xia-Ji Liu, Hui Hu
Summary: In this study, an exact relation between Tan's universal contact and the photoexcitation rate of a strongly interacting Fermi gas is theoretically derived and experimentally validated. The research findings provide important insights for accurately measuring the Tan's contact coefficient at finite temperatures in future experiments.
Article
Optics
Jia Wang, Krzysztof Sacha, Peter Hannaford, Bryan J. Dalton
Summary: Discrete time crystals (DTCs) are studied in a periodically driven quantum system, focusing on a Bose-Einstein condensate bouncing on an oscillating mirror. Characteristic features of DTC formation and long-time behavior, including the appearance of a symmetry-breaking edge and the occurrence of quantum revivals, are identified.
Article
Optics
Hui Hu, Zeng-Qiang Yu, Jia Wang, Xia-Ji Liu
Summary: In this study, a first-order Bose-Einstein condensation is predicted in a cloud of harmonically trapped bosons with attractive two-body and repulsive three-body interactions. A rich phase diagram is determined, showing a tricritical point where the quantum droplet, superfluid gas, and normal gas phases meet. This suggests that an ensemble of spin-polarized tritium atoms could be a promising candidate to observe the predicted first-order condensation.
Article
Physics, Multidisciplinary
Marko Gacesa, Jason N. Byrd, Jonathan Smucker, John A. Montgomery, Robin Cote
Summary: This study investigates the feasibility of optically forming long-range tetratomic and larger polyatomic molecules in their ground electronic state from ultracold pairs of polar molecules aligned by external fields. Depending on the relative orientation of the interacting diatomic molecules, a novel type of tetratomic molecule has been discovered, and (KRb)2 and (RbCs)2 complexes have been successfully produced in experiments. Based on universal properties of long-range interactions between polar molecules, the approach could be generalized to form larger polyatomic molecules.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Sebastian Schiffer, Xia-Ji Liu, Hui Hu, Jia Wang
Summary: We studied a generalized Aubry-Andre model that follows PT symmetry, and found a robust PT-symmetric phase that can support an Anderson localization transition. The model provides a perfect platform for studying disorder-driven localization phenomena in a PT-symmetric system.
