Results 51 to 60 of about 142,410 (240)

Coherent gamma photon generation in a Bose–Einstein condensate of 135mCs

Physics Letters B, 2018
We have identified a mechanism of collective nuclear de-excitation in a Bose–Einstein condensate of 135Cs atoms in their isomeric state, 135mCs, suitable for the generation of coherent gamma photons.
Luca Marmugi, Philip M. Walker, Ferruccio Renzoni   +2 more
doaj   +1 more source

Bose-Einstein condensate of Dirac magnons: Pumping and collective modes

Physical Review Research, 2021
We explore the formation and collective modes of Bose-Einstein condensate of Dirac magnons (Dirac BEC). While we focus on two-dimensional Dirac magnons, an employed approach is general and could be used to describe Bose-Einstein condensates with linear ...
P. O. Sukhachov, S. Banerjee, A. V. Balatsky   +2 more
doaj   +1 more source

A Dicke Type Model for Equilibrium BEC Superradiance

, 2004
We study the effect of electromagnetic radiation on the condensate of a Bose gas. In an earlier paper we considered the problem for two simple models showing the cooperative effect between Bose-Einstein condensation and superradiance.
Andreev A V, André Verbeure, Brankov J G, Fannes M, Girardeau M, Hepp K, Joseph V Pulé, Pulé J V, Robinson D W, Valentin A Zagrebnov, van den Berg M   +10 more
core   +5 more sources

A fundamental limit for integrated atom optics with Bose-Einstein condensates

, 2003
The dynamical response of an atomic Bose-Einstein condensate manipulated by an integrated atom optics device such as a microtrap or a microfabricated waveguide is studied.
A.E. Leanhardt, C. Henkel, D. Müller, D.S. Petrov, E. Andersson, E. Braaten, E. Braaten, E.A. Hinds, Ewan M. Wright, F.Kh. Abdullaev, H. Shi, Han Pu, J. Fortagh, J. Fortagh, J. Reichel, J.D. Weinstein, J.H. Thywissen, M. Olshanii, M. Ueda, Michael W. Jack, N.H. Dekker, P.F. Bedaque, Pierre Meystre, R. Folman, S. Dyachenko, Thorsten Köhler, V.E. Zakharov, Weiping Zhang   +27 more
core   +1 more source

Bose-Einstein condensation of indirect excitons in coupled quantum wells

, 2003
We study the ground-state properties of a quasi-two-dimensional Bose-Einstein condensate of indirect excitons, which are confined in an anisotropic harmonic potential. Incorporating the interactions, we calculate the order parameter variationally.
Kavoulakis, G. M.
core   +1 more source

Softening of roton and phonon modes in a Bose-Einstein condensate with spin-orbit coupling. [PDF]

Physical Review Letters, 2014
Roton-type excitations usually emerge from strong correlations or long-range interactions, as in superfluid helium or dipolar ultracold atoms. However, in a weakly short-range interacting quantum gas, the recently synthesized spin-orbit (SO) coupling can
S. Ji, Long Zhang, Xiao-Tian Xu, Zhan Wu, Youjin Deng, Shuai Chen, Jian-Wei Pan   +6 more
semanticscholar   +1 more source

Transient Supersolid Properties in an Array of Dipolar Quantum Droplets

Physical Review X, 2019
We study theoretically and experimentally the emergence of supersolid properties in a dipolar Bose-Einstein condensate. The theory reveals a ground state phase diagram with three distinct regimes—a regular Bose-Einstein condensate and incoherent and ...
Fabian Böttcher, Jan-Niklas Schmidt, Matthias Wenzel, Jens Hertkorn, Mingyang Guo, Tim Langen, Tilman Pfau   +6 more
doaj   +1 more source

Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap. [PDF]

Physical Review Letters, 2007
We have observed the persistent flow of Bose-condensed atoms in a toroidal trap. The flow persists without decay for up to 10 s, limited only by experimental factors such as drift and trap lifetime.
C. Ryu, C. Ryu, M. Andersen, P. Cladé, V. Natarajan, K. Helmerson, K. Helmerson, W. Phillips, W. Phillips   +8 more
semanticscholar   +1 more source

Strongly Coupled Exciton–Hyperbolic‐Phonon‐Polariton Hybridized States in hBN‐Encapsulated Biased Bilayer Graphene

Advanced Optical Materials, EarlyView.
Excitons in biased bilayer graphene are electrically tunable excitations in the mid‐infrared (MIR) spectrum, where optical transitions are typically scarce. In this work, it is demonstrated that when the bilayer is encapsulated in hexagonal‐boron‐nitride (hBN)—a material supporting optical phonons and hyperbolic‐phonon‐polaritons (HPhPs) in the MIR—the
Tomer Eini, N. M. R. Peres, Yarden Mazor, Itai Epstein   +3 more
wiley   +1 more source

Temporal evolution of cosmological density perturbations of the Bose–Einstein condensate dark matter

European Physical Journal C: Particles and Fields
Dark matter is assumed to be composed of scalar boson particles that form Bose–Einstein condensate during the cosmic evolution of the Universe when the temperature of the dark matter is below the critical temperature $$T_{cr}$$ T cr .
Subhra Mondal, Amitava Choudhuri
doaj   +1 more source