Article
Astronomy & Astrophysics
Andrew Eberhardt, Alvaro Zamora, Michael Kopp, Tom Abel
Summary: The study examines the approximation of interacting Bosonic systems by classical fields as total occupation number increases, using a new parallel solver QIBS. Different toy models are tested to track quantum corrections in the classical field description, finding that only number eigenstates do not converge to classical evolution with increased occupation number. The scaling of the quantum breaktime depends on model interactions and initial conditions, with some systems exhibiting logarithmic enhancement and others showing power law enhancement.
Article
Materials Science, Multidisciplinary
R. Au-Yeung, M. H. Szymanska, E. Ginossar
Summary: In this study, using Keldysh field theory, the conditions for nonequilibrium condensation in the open Tavis-Cummings model under a direct finite-bandwidth incoherent cavity drive were investigated. The drive-dependent effective coupling between spin-1/2 particles and the critical regime of driving for the condensation transition were accurately predicted.
Article
Multidisciplinary Sciences
Xingran Xu, Tanjung Krisnanda, Timothy C. H. Liew
Summary: In this study, we investigate atoms in two periodic potentials induced by different lasers, one of which is coupled to a mechanical membrane via radiation pressure force. The dynamics of the atoms' position and momentum are treated classically, while the membrane, the cavity field, and the intrinsic two-level atoms are treated quantum mechanically. We find that the mean excitation of the three systems can be stable, periodically oscillating, or in a chaotic state depending on the strength of the coupling between them. We define regular, limit cycle, and chaotic phases and demonstrate how to achieve these phases by manipulating the field-membrane and field-atom coupling strengths. Additionally, we compute observable quantities such as position, momentum, and correlation functions that reflect the system's phase. Our proposal presents a new approach to generate and control limit cycle and chaotic phases in a well-established atom-optomechanics system.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Jiaxin Zhao, Antonio Fieramosca, Ruiqi Bao, Wei Du, Kevin Dini, Rui Su, Jiangang Feng, Yuan Luo, Daniele Sanvitto, Timothy C. H. Liew, Qihua Xiong
Summary: Researchers have observed nonlinear optical parametric polaritons in a WS2 monolayer microcavity, which opens up new possibilities for the development of all-optical valley polariton nonlinear devices.
NATURE NANOTECHNOLOGY
(2022)
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
Astronomy & Astrophysics
D. M. Reis, C. A. A. de Carvalho
Summary: In this study, deviations from ideal gas behavior of a relativistic gas of charged scalar bosons caused by current-current interaction induced by electromagnetic quantum fluctuations were computed using scalar quantum electrodynamics. Expressions for those quantities in ultra-relativistic and nonrelativistic limits were obtained, and numerical results for the relativistic case were presented. (C) 2021 The Author(s). Published by Elsevier B.V.
Article
Physics, Multidisciplinary
J. L. Lopez-Picon, J. Manuel Lopez-Vega
Summary: This study revisits the thermodynamic geometry of the Bose-Einstein fluid within the framework of information geometry, particularly considering the strongly degenerate case for a finite volume. The ground state contribution is found to be relevant in highly quantum conditions, affecting the scalar curvature R in the limit of condensation. The curvature is shown to be finite and approach zero smoothly as the fugacity tends to the numerical value where condensation occurs, indicating stronger quantum effects.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Subhajit Sarkar, Yonatan Dubi
Summary: The authors demonstrate the survival of discrete time-crystals and quasi-crystals in a general class of environments and propose a method to observe discrete time-crystals by measuring transport properties in quantum dot arrays.
COMMUNICATIONS PHYSICS
(2022)
Article
Astronomy & Astrophysics
Andrew Eberhardt, Michael Kopp, Alvaro Zamora, Tom Abel
Summary: The numerical method and PYTHON package CHiMES introduces a second order extension of classical field approach to accurately simulate quantum systems initially well approximated by mean field theory. The success of this method depends on two conditions: the quantum system must be well described by classical theory initially, and the growth of the higher order moments must be hierarchical.
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
Multidisciplinary Sciences
Hangyong Shan, Lukas Lackner, Bo Han, Evgeny Sedov, Christoph Rupprecht, Heiko Knopf, Falk Eilenberger, Johannes Beierlein, Nils Kunte, Martin Esmann, Kentaro Yumigeta, Kenji Watanabe, Takashi Taniguchi, Sebastian Klembt, Sven Hoefling, Alexey Kavokin, Sefaattin Tongay, Christian Schneider, Carlos Anton-Solanas
Summary: The study demonstrates a strong light-matter coupling regime between microcavity photons and excitons in an atomically thin WSe2. Coherence buildup is accompanied by a threshold-like behavior in the emitted light intensity, characteristic of a polariton laser effect. Valley physics is also evident in the manipulation of polaritons via the valley-Zeeman effect in the presence of an external magnetic field.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Emanuele G. Dalla Torre, Matthew J. Reagor
Summary: Lasers and Bose-Einstein condensates exhibit macroscopic quantum coherence in different ways, with lasers having a defined global phase and fluctuating photon numbers, while BECs have a conserved number of particles and an undefined global phase. Researchers have created a unified framework connecting these two states using gate-based quantum circuits. By measuring the total number of particles without destroying coherence, they found that particle conservation enhances long-range phase coherence.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Wenyu Xing, Ranran Cai, Kodai Moriyama, Kensuke Nara, Yunyan Yao, Weiliang Qiao, Kazuyoshi Yoshimura, Wei Han
Summary: This paper reports the study of the spin Seebeck effect (SSE) in single crystalline Pb2V3O9 and finds a strong correlation between the temperature-dependent critical magnetic fields and the Bose-Einstein condensation phase of the quantum magnet Pb2V3O9. This shows the potential of using spin current as a probe to study the spin correlation and phase transition properties in quantum magnets.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Jia Wang, Xia-Ji Liu, Hui Hu
Summary: In this theoretical study, the finite-temperature structure and collective excitations of a self-bound ultradilute Bose droplet in a binary Bose mixture with attractive inter-species interactions on the verge of mean-field collapse are investigated. Significant temperature effects are found in the density distribution and collective excitation spectrum of the Bose droplet, with the critical number of particles at the droplet-to-gas transition dramatically increasing with temperature. The predicted temperature effects of a self-bound Bose droplet in this work may be difficult to measure experimentally due to the lack of efficient thermometry at low temperatures, but could already be present in current cold-atom experiments.
Article
Instruments & Instrumentation
Yong-Guang Zheng, Lei Jiang, Zi-Hang Zhu, Wei-Yong Zhang, Zhao-Yu Zhou, Bo Xiao, Zhen-Sheng Yuan
Summary: Researchers present a compact and gain-enhanced microwave helical antenna for manipulating ultracold Rb-87 atoms coherently. By replacing the reflecting plate, the antenna reduces the voltage standing wave ratio and increases the gain. Applying this antenna to ultracold Rb-87 atomic experiments, they achieve a Rabi frequency of the oscillation between the hyperfine levels.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Multidisciplinary
Rafal Mirek, Andrzej Opala, Paolo Comaron, Magdalena Furman, Mateusz Krol, Krzysztof Tyszka, Bartlomiej Seredynski, Dario Ballarini, Daniele Sanvitto, Timothy C. H. Liew, Wojciech Pacuski, Jan Suffczynski, Jacek Szczytko, Michal Matuszewski, Barbara Pietka
Summary: The rapid development of artificial neural networks and applied artificial intelligence has led to various applications, but current software implementation is limited in terms of performance and energy efficiency. Further progress may require the development of neuromorphic systems mimicking the structure of the human brain. By utilizing an optical network of nodes and semiconductor microcavities, efficient computation with nonlinearity can be achieved, showing promising results in pattern recognition tasks. This work opens up possibilities for ultrafast and energy-efficient neuromorphic systems leveraging the optical nonlinearity of polaritons.
Article
Physics, Multidisciplinary
T. Bland, E. Poli, C. Politi, L. Klaus, M. A. Norcia, F. Ferlaino, L. Santos, R. N. Bisset
Summary: A robust supersolid state can be formed in a two-dimensional system by directly evaporative cooling into the supersolid phase. The research provides a theoretical basis for the formation process of two-dimensional supersolids and defines a practical path to the formation of large two-dimensional supersolid arrays.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Matthew A. Norcia, Elena Poli, Claudia Politi, Lauritz Klaus, Thomas Bland, Manfred J. Mark, Luis Santos, Russell N. Bisset, Francesca Ferlaino
Summary: Angular oscillations can serve as a useful probe for superfluid properties, but in systems with 2D structure, the frequency of angular oscillations remains nearly unchanged even with significant alterations in superfluidity, suggesting that they may not always provide a robust experimental probe for superfluidity with typical experimental protocols.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Lauritz Klaus, Thomas Bland, Elena Poli, Claudia Politi, Giacomo Lamporesi, Eva Casotti, Russell N. Bisset, Manfred J. Mark, Francesca Ferlaino
Summary: This study investigates the phenomenon of quantized vortices in ultracold gases composed of lanthanide atoms, utilizing manipulation of atoms and rotating external magnetic fields.
Article
Physics, Multidisciplinary
Gabriele Natale, Thomas Bland, Simon Gschwendtner, Louis Lafforgue, Daniel S. Grun, Alexander Patscheider, Manfred J. Mark, Francesca Ferlaino
Summary: Three-dimensional quantum gases of strongly dipolar atoms can exhibit a transition from a dilute gas to a dense macrodroplet. In this study, a one-dimensional optical lattice is used to explore the role of quantum fluctuations and observe different phases. The results show the presence of macrodroplets extended over several lattice sites and a transition to a state localized to a single lattice plane. A numerical model is developed to explain the experimental observations, revealing the characteristics of different types of macrodroplets and a two-dimensional soliton.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Gabriel Wlazlowski, Klejdja Xhani, Marek Tylutki, Nikolaos P. Proukakis, Piotr Magierski
Summary: We characterize the dominant dynamical regimes in a superfluid ultracold fermionic Josephson junction numerically. We discuss the onset and physical mechanism of dissipation due to the superflow exceeding a characteristic speed, and provide evidence distinguishing its physical mechanism across the weakly and strongly interacting limits. In the strongly interacting regime, dissipation occurs through the phase-slippage process, caused by the emission and propagation of quantum vortices and sound waves similar to the Bose-Einstein condensation limit. In the weak interaction limit, the main dissipative channel arises through the pair-breaking mechanism.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
R. Panico, P. Comaron, M. Matuszewski, A. S. Lanotte, D. Trypogeorgos, G. Gigli, M. De Giorgi, V. Ardizzone, D. Sanvitto, D. Ballarini
Summary: Turbulent phenomena are observed in both classical and quantum fluids, with the latter requiring precise manipulation of quantum fluids. In this study, we measured the turbulent dynamics of a two-dimensional quantum fluid of exciton-polaritons, a hybrid light-matter quasiparticle. The formation of clusters of quantum vortices was triggered by the increase of the incompressible kinetic energy per vortex, demonstrating the tendency of the vortex-gas towards highly excited configurations despite the dissipative nature of the system. These findings provide a foundation for investigating quantum turbulence in two-dimensional fluids of light.
Article
Physics, Multidisciplinary
G. Dagvadorj, P. Comaron, M. H. Szyma
Summary: We investigate a four-component polariton system in the optical parametric oscillator regime and find that all four components exhibit the same BKT critical point and algebraic decay of spatial coherence. However, the creation of topological defects near the phase transition is largely independent of intercomponent mode locking and strongly depends on the density within a given mode. This unique characteristic allows us to discover a novel state of matter characterized by the proliferation of topological defects on a superfluid with algebraic decay of coherence, which can be observed in current experiments.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
D. Scheiermann, L. A. Pena Ardila, T. Bland, R. N. Bisset, L. Santos
Summary: Breakthrough experiments have recently explored the fascinating physics of dipolar quantum droplets and supersolids. The realization of dipolar mixtures has opened up further intriguing possibilities. It has been shown that the presence of a second component under certain conditions catalyzes droplet nucleation and supersolidity in an unmodulated condensate. This catalyzation mechanism can lead to the formation of a two-fluid supersolid with different superfluid fractions for each component, providing interesting prospects for studying spin physics in dipolar supersolids.
Article
Physics, Multidisciplinary
Wyatt Kirkby, Thomas Bland, Francesca Ferlaino, Russell N. Bisset
Summary: We present a theoretical study on the behavior of a mixture of antidipolar and nondipolar Bose-Einstein condensates confined to an infinite tube. We predict the presence of a spin roton and its associated instability, which leads to a continuous unmodulated-to-supersolid phase transition. We explore the phase diagram of the binary system and investigate the dynamic formation of supersolids from a uniform miscible phase while maintaining phase coherence.
SCIPOST PHYSICS CORE
(2023)
Article
Physics, Multidisciplinary
T. Bland, I. V. Yatsuta, M. Edwards, Y. O. Nikolaieva, A. O. Oliinyk, A. Yakimenko, N. P. Proukakis
Summary: In this work, a method to engineer transport of quantized vorticity in closed quantum fluid circuits is developed. The controllable periodic transfer of current is observed and characterized by introducing a tunable weak link between ring-shaped atomic Bose-Einstein condensates. The role of temperature on suppressing these oscillations is investigated using complementary state-of-the-art numerical methods.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
T. Bland, E. Poli, L. A. Pena Ardila, L. Santos, F. Ferlaino, R. N. Bisset
Summary: This article investigates the nature of supersolidity in two-component dipolar condensates and predicts the existence of a binary supersolid state. It also highlights the ability of a dipolar component to induce supersolidity in a nondipolar component.
Article
Physics, Multidisciplinary
N. A. Keepfer, I. -K Liu, F. Dalfovo, N. P. Proukakis
Summary: The equilibrium properties of a weakly interacting atomic Bose gas across the BKT and BEC phase transitions have been numerically studied through a dimensional crossover from two to three dimensions. The findings show a continuous shift in the character of the phase transition from BKT to BEC, and an increase in the critical temperature with dimensionality.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
K. Xhani, N. P. Proukakis
Summary: We numerically demonstrated and characterized the emergence of distinct dynamical regimes of a finite-temperature bosonic superfluid in an elongated Josephson junction. The dissipation of the superfluid to the thermal cloud was found to depend on two physical parameters: the initial chemical potential difference and the ratio of thermal energy to barrier amplitude.
PHYSICAL REVIEW RESEARCH
(2022)
