Article
Multidisciplinary Sciences
Yair Margalit, Yu-Kun Lu, Furkan Cagri Top, Wolfgang Ketterle
Summary: The phenomenon of Pauli blocking of light scattering in a dense quantum-degenerate Fermi gas of ultracold lithium atoms has been observed, with a 37% suppression of light scattered even at large angles at low temperatures compared to higher temperatures.
Article
Optics
Jae-Gyun Baak, Uwe R. Fischer
Summary: This study investigates the classical and quantum Fisher information of the interaction coupling in the Lieb-Liniger model, with a focus on the dependence on system size and interaction strength.
Article
Physics, Multidisciplinary
Isabelle Bouchoule, Jerome Dubail, Lea Dubois, Dimitri M. Gangardt
Summary: Motivated by recent experiments, this study investigates the Lieb-Liniger gas initially prepared in an out-of-equilibrium state that is Gaussian in terms of the phonons. The gas relaxes to a stationary state at very long times whose phonon population is different from the initial one. Using the Bethe-ansatz mapping and bosonization techniques, the stationary state of the gas after relaxation is characterized and its phonon population distribution is computed. The results are applied to the case of an excited coherent state for a single phonon mode and compared to exact results obtained in the hard-core limit.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
M. Beau, A. del Campo, D. J. Frantzeskakis, T. P. Horikis, P. G. Kevrekidis
Summary: This article investigates the interplay of repulsive short-range and same-sign long-range interactions in the dynamics of dark solitons in a trapped one-dimensional Bose gas. The study shows that single- and multiple-dark-soliton states can exist and are generically robust in the presence of long-range interactions. The frequencies of the soliton oscillations are significantly upshifted as the strength of the long-range interactions is increased.
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
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
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
Optics
Pedro Pessoa
Summary: This study presents an exact calculation of thermodynamical quantities related to Bose-Einstein condensation in arbitrary quantum systems, without relying on the thermodynamic limit. Results show that the derivative of specific heat in a three-dimensional box gas reaches smaller values than expected in the thermodynamic limit, confirming the importance of understanding the role of the thermodynamic limit in phase transitions. This approach allows for precise calculations irrespective of temperature, providing a way to further study BE statistics without relying on approximations near critical temperature or the thermodynamic limit.
Article
Optics
Rafi Weill, Alexander Bekker, Boris Levit, Baruch Fischer
Summary: In this study, photon Bose-Einstein condensation was demonstrated over a broad temperature range, showing its validity in the long 1D fiber cavity limit. The experimental results confirmed a square-root mode-dispersion and a quadratic temperature dependence of the critical power for condensation between 90K and 382K.
Article
Materials Science, Multidisciplinary
Sreemayee Aditya, Diptiman Sen
Summary: In this study of a one-dimensional lattice model, various phenomena such as fermion interactions and Tomonaga-Luttinger liquids were observed, with a focus on understanding the influence of parameters phi and eta on the system properties.
Article
Physics, Fluids & Plasmas
Jun Hong, Chenhui Wang, Yongping Zhang
Summary: In this paper, a method to stabilize the Bloch states in BECs is proposed, which is achieved by using an out-of-phase linear lattice. The stabilization mechanism is explained through the averaged interaction. Furthermore, the effect of incorporating a constant interaction into BECs with mixed nonlinear and linear lattices on the instabilities of Bloch states in the lowest band is revealed.
Article
Quantum Science & Technology
Dong Xie, Chunling Xu
Summary: By utilizing the invariant subspaces of polaritons, the precision of temperature measurement at low temperatures can be improved. The measurement precision of low temperature significantly increases with the number of polariton states. In order to resist dissipation and avoid wastefulness, incoherent pumping is necessary for temperature measurement.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Physics, Multidisciplinary
Vladislav Yu. Shishkov, Evgeny S. Andrianov, Anton V. Zasedatelev, Pavlos G. Lagoudakis, Yurii E. Lozovik
Summary: In this study, we analytically describe a nonequilibrium polariton Bose-Einstein condensate (BEC) by solving the master equation for the full polariton density matrix in the fast thermalization limit. We find that the density matrix of a nonequilibrium BEC incorporates quantum correlations between all polariton states, and the formation of BEC is accompanied by the emergence of cross-correlations between the ground state and the excited states. Despite being a nonequilibrium system, the average population of polariton states follows the Bose-Einstein distribution with an almost zero effective chemical potential above the condensation threshold, similar to an equilibrium BEC. Moreover, we demonstrate that the effective temperature of polaritons drops below the reservoir temperature above threshold.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
A. H. Abbas, X. Meng, R. S. Patil, J. A. Ross, A. G. Truscott, S. S. Hodgman
Summary: The study successfully achieved the Bose-Einstein condensation of metastable helium atoms using a vacuum coil magnetic trap and a crossed-beam optical dipole trap, observing essentially pure BECs without additional evaporative cooling.
Article
Optics
S. B. Prasad, B. C. Mulkerin, A. M. Martin
Summary: By examining the influence of a rotating uniform magnetic field on trapped dipolar Bose-Einstein condensates, this study reveals previously unknown stationary solution branches and the nontrivial relationship between the tilt angle of the body frame of the stationary state and factors like trapping geometry, rotation frequency, and dipole tilt angle. Despite the stationary state density profile appearing equivalent to the profile expected in an averaged dipolar potential under certain conditions, linearizing the time-dependent superfluid hydrodynamics shows that these states are dynamically unstable and may lead to turbulent decay.