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We experimentally and theoretically study the peak fraction of a Bose-Einstein condensate loaded into a cubic optical lattice as the lattice potential depth and entropy per particle are varied. This system is well-described by the…

量子气体 · 物理学 2015-06-23 David McKay , Ushnish Ray , Stefan Natu , Philip Russ , David Ceperley , Brian DeMarco

Solving the time-dependent quantum many-body Schr\"odinger equation is a challenging task, especially for states at a finite temperature, where the environment affects the dynamics. Most existing approximating methods are designed to…

量子物理 · 物理学 2024-05-24 Jannes Nys , Zakari Denis , Giuseppe Carleo

The Monitored Drift Tube (MDT) chambers for the muon spectrometer of the ATLAS detector at the Large Hadron Collider (LHC) consist of 3-4 layers of pressurised drift tubes on either side of a space frame carrying an optical deformation…

We examine the effect of non-equilibrium processes modeled by the introduction of a generalized Boltzmann factor on the thermal and magnetic properties of an array of two-dimensional GaAs quantum dots in the presence of an external uniform…

材料科学 · 物理学 2020-05-20 Jorge David Castaño-Yepes , D. A. Amor-Quiroz

We investigate potential deviations from the standard adiabatic evolution of the cosmic microwave background (CMB) temperature, $T_{\rm CMB}(z)$, using the latest Sunyaev-Zeldovich (SZ) effect measurements and molecular line excitation…

宇宙学与河外天体物理 · 物理学 2025-10-02 Ruchika , William Giarè , Elsa M. Teixeira , Alessandro Melchiorri

We study the temporal expansion of an ultracold Bose gas in two-dimensional, square optical lattices. The gas is described by the Bose-Hubbard model deep in the superfluid regime, with initially all bosons condensed in the central site of…

量子气体 · 物理学 2021-03-17 Mauricio Trujillo-Martinez , Anna Posazhennikova , Johann Kroha

We review on and give some further details about the thermodynamical properties of the \mu-Bose gas model (arXiv:1309.1363) introduced by us recently. This model was elaborated in connection with \mu-deformed oscillators. Here, we present…

量子物理 · 物理学 2014-01-31 A. P. Rebesh , I. I. Kachurik , A. M. Gavrilik

We present thermal conductivity measurements performed in three short-period (GaAs)_9(AlAs)_5 superlattices. The samples were grown at different temperatures, leading to different small scale roughness and broadening of the interfaces. The…

材料科学 · 物理学 2009-10-08 J. -Y. Duquesne

We analyze the results of a recent experiment with bosonic rubidium atoms harmonically confined in a quasi-two-dimensional geometry. In this experiment a well defined critical point was identified, which separates the high-temperature…

其他凝聚态物理 · 物理学 2008-05-06 Zoran Hadzibabic , Peter Krüger , Marc Cheneau , Steffen Patrick Rath , Jean Dalibard

We study the power of PLANCK data to constrain deviations of the Cosmic Microwave Background black body temperature from adiabatic evolution using the thermal Sunyaev-Zeldovich anisotropy induced by clusters of galaxies. We consider two…

We consider the properties of a gas of bosonic diatomic molecules in the limit when few of the molecules are dissociated. Taking into account the effects of dissociation and scattering among molecules and atoms, we calculate the dispersion…

其他凝聚态物理 · 物理学 2015-06-25 L. M. Jensen , H. Mäkelä , C. J. Pethick

Mist/air two-phase flow is a promising cooling technique for many applications such as internal cooling of gas turbine blades. A significant enhancement of heat transfer can be achieved with a low mass fraction of droplets by utilizing the…

流体动力学 · 物理学 2024-07-09 Junxian Cao , Mengqi Ye , Haiwang Li , Tianyou Wang , Zhizhao Che

A priori, cosmic-ray measurements offer a unique capability to determine the vertical profile of atmospheric temperatures directly from ground. However, despite the increased understanding of the impact of the atmosphere on cosmic-ray…

大气与海洋物理 · 物理学 2021-12-10 Riádigos Irma , González-Díaz Diego , Pérez-Muñuzuri Vicente

We investigate the properties of charmonia in a thermal medium, showing that with increasing temperature the decay widths of these mesons behave in a non-trivial way. Our analysis is based on a potential model with interaction potential…

高能物理 - 唯象学 · 物理学 2009-09-24 Floriana Giannuzzi , Massimo Mannarelli

We investigate the interplay of temperature and trap effects in cold particle systems at their quantum critical regime, such as cold bosonic atoms in optical lattices at the transitions between Mott-insulator and superfluid phases. The…

量子气体 · 物理学 2013-05-30 Giacomo Ceccarelli , Christian Torrero , Ettore Vicari

We study the properties of ultracold Fermi gases in a three-dimensional optical lattice when crossing a Feshbach resonance. By using a zero-temperature formalism, we show that three-body processes are enhanced in a lattice system in…

其他凝聚态物理 · 物理学 2007-05-23 Helmut G. Katzgraber , Aniello Esposito , Matthias Troyer

We report the first demonstration of cooling by three-body losses in a Bose gas. We use a harmonically confined one-dimensional (1D) Bose gas in the quasi-condensate regime and, as the atom number decreases under the effect of three-body…

量子气体 · 物理学 2018-11-21 Max Schemmer , Isabelle Bouchoule

The anharmonicity of a magnetic atomic trap at long distances from its center (forty times the radius of the first atomic orbit along the elongated axis, i.e. hundreds of microns) is shown to increase up to 45 % the temperature for…

凝聚态物理 · 物理学 2007-05-23 Augusto Gonzalez

We report on residual gas damping of the motion of a macroscopic test mass enclosed in a nearby housing in the molecular flow regime. The damping coefficient, and thus the associated thermal force noise, is found to increase significantly…

广义相对论与量子宇宙学 · 物理学 2011-07-14 A. Cavalleri , G. Ciani , R. Dolesi , A. Heptonstall , M. Hueller , D. Nicolodi , S. Rowan , D. Tombolato , S. Vitale , P. J. Wass , W. J. Weber

We present the MAssive ClusterS and Intercluster Structures (MACSIS) project, a suite of 390 clusters simulated with baryonic physics that yields realistic massive galaxy clusters capable of matching a wide range of observed properties.…

宇宙学与河外天体物理 · 物理学 2016-12-14 David J. Barnes , Scott T. Kay , Monique A. Henson , Ian G. McCarthy , Joop Schaye , Adrian Jenkins