Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Yakimenko, Alexander A."'
Autor:
Borysenko, Yurii, Bazhan, Nataliia, Prykhodko, Olena, Pfeiffer, Dominik, Lind, Ludwig, Birkl, Gerhard, Yakimenko, Alexander
Precise control of topologically protected excitations, such as quantum vortices in atomtronic circuits, opens new possibilities for future quantum technologies. We theoretically investigate the dynamics of Josephson vortices (rotational fluxons) ind
Externí odkaz:
http://arxiv.org/abs/2411.09186
We study the dynamics of solitons under the action of one-dimensional quasiperiodic lattice potentials, fractional diffraction, and nonlinearity. The formation and stability of the solitons is investigated in the framework of the fractional nonlinear
Externí odkaz:
http://arxiv.org/abs/2409.18299
Publikováno v:
Physical Review B, 109, 214516 (2024)
We theoretically investigate the acoustic analogues of high-angular-momentum rotating black holes in exciton-polariton condensates. Performing numerical simulations of a long-lived ring-shaped condensate configuration with an acoustic horizon and erg
Externí odkaz:
http://arxiv.org/abs/2311.11117
Publikováno v:
New Journal of Physics, Volume 25, 103003 (2023)
We investigate the effects of ellipticity-induced curvature on atomic Bose-Einstein condensates confined in quasi-one-dimensional closed-loop waveguides. Our theoretical study reveals intriguing phenomena arising from the interplay between curvature
Externí odkaz:
http://arxiv.org/abs/2306.11873
Publikováno v:
Phys. Rev. Research 5, 023109 (2023)
Ghost vortices constitute an elusive class of topological excitations in quantum fluids since the relevant phase singularities fall within regions where the superfluid density is almost zero. Here we present a platform that allows for the controlled
Externí odkaz:
http://arxiv.org/abs/2303.05403
Autor:
Bazhan, Nataliia, Svetlichny, Anton, Pfeiffer, Dominik, Derr, Daniel, Birkl, Gerhard, Yakimenko, Alexander
Publikováno v:
Published in Phys. Rev. A 106, 043305 (2022)
Coupled coaxially stacked toroidal condensates with persistent currents suggest an appealing physical platform for the investigation of various phenomena related to interacting superflows from Josephson effects in the regime of weak interactions to t
Externí odkaz:
http://arxiv.org/abs/2204.14269
Acoustic analogue of Hawking radiation in quantized circular superflows of Bose-Einstein condensates
Publikováno v:
Phys. Rev. Research 2, 043065 (2020)
We propose emulation of Hawking radiation (HR) by means of acoustic excitations propagating on top of persistent current in an atomic Bose-Einstein condensate (BEC) loaded in an annular confining potential. The setting is initially created as a spati
Externí odkaz:
http://arxiv.org/abs/2006.12828
Publikováno v:
Symmetry 2019, 11, 1312; "Symmetry Breaking Bose-Einstein Condensates" (special issue of the MDPI journal)
We demonstrate that the evolution of superflows in interacting persistent currents of ultracold gases is strongly affected by symmetry breaking of the quantum vortex dynamics. We study counter-propagating superflows in a system of two parallel rings
Externí odkaz:
http://arxiv.org/abs/1909.08116
We consider merger of two parallel toroidal atomic Bose-Einstein condensates with different vorticities in a three-dimensional (3D) trap. In the tunnel-coupling regime, Josephson vortices (rotational fluxons) emerge in the barrier between the superfl
Externí odkaz:
http://arxiv.org/abs/1908.02468
Considerable progress in experimental studies of atomic gases in a toroidal geometry has opened up novel prospects for the investigation of fundamental properties of superfluid states and creation of new configurations for atomtronic circuits. In par
Externí odkaz:
http://arxiv.org/abs/1901.06502