Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Karkkainen, K."'
Publikováno v:
Phys. Rev. A 78 (2008) 033610
We examine the dynamics of two bright solitary waves with a negative nonlinear term. The observed repulsion between two solitary waves -- when these are in an antisymmetric combination -- is attributed to conservation laws. Slight breaking of parity,
Externí odkaz:
http://arxiv.org/abs/0801.2364
Publikováno v:
Phys. Rev. A 76 (2007) 043627
We examine the conditions that give rise to metastable, persistent currents in a trapped Bose-Einstein condensate. A necessary condition for the stability of persistent currents is that the trapping potential is not a monotonically increasing functio
Externí odkaz:
http://arxiv.org/abs/0709.0405
Autor:
Christensson, J., Bargi, S., Karkkainen, K., Yu, Y., Kavoulakis, G. M., Manninen, M., Reimann, S. M.
Publikováno v:
New J. Phys., 10 (2008) 033029
A rotating, two-component Bose-Einstein condensate is shown to exhibit vortices of multiple quantization, which are possible due to the interatomic interactions between the two species. Also, persistent currents are absent in this system. Finally, th
Externí odkaz:
http://arxiv.org/abs/0704.0447
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 40 (2007) 2653-2660.
We examine the spin asymmetry of ground states for two-dimensional, harmonically trapped two-component gases of fermionic atoms at zero temperature with weakly repulsive short range interactions. Our main result is that, in contrast to the three-dime
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702600
Publikováno v:
Phys. Rev. Lett. 99, p. 010402 (2007)
Many-body effects in confined quantum systems pose a challenging problem due to the simultaneous presence of particle-particle interactions and spatial inhomogeneity. Here we investigate universal properties of strongly confined particles that turn o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702246
Artificially confined, small quantum systems show a high potential for employing quantum physics in technology. Ultra-cold atom gases have opened an exciting laboratory in which to explore many-particle systems that are not accessible in conventional
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607718
We employ the density functional Kohn-Sham method in the local spin-density approximation to study the electronic structure and magnetism of quasi one-dimensional periodic arrays of few-electron quantum dots. At small values of the lattice constant,
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505036
Publikováno v:
Solid State Communication 130, 187 (2004)
We studied a vertical ``quantum dot molecule'', where one of the dots is occupied with electrons and the other with holes. We find that different phases occur in the ground state, depending on the carrier density and the interdot distance. When the s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310338
Publikováno v:
Phys. Rev. B 68, 205322 (2003)
We discuss the exchange-correlation energy of a multicomponent (multi-valley) two-dimensional electron gas and show that an extension of the recent parametrisation of the exchange-correlation energy by Attacalite et al (Phys. Rev. Lett. 88, 256601 (2
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310059
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