11 citations · 29 across the 4 of their papers we have counts for
4 papers
Bright solitary waves in a Bose-Einstein condensate and their interactions
K. Karkkainen, A. D. Jackson, G. M. Kavoulakis
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 combina…
Metastability of persistent currents in trapped gases of atoms
K. Karkkainen, J. Christensson, G. Reinisch +2
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…
Electron-hole bilayer quantum dots: Phase diagram and exciton localization
K. Karkkainen, M. Koskinen, M. Manninen +1
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,…
Exchange-correlation energy of a multicomponent two-dimensional electron gas
K. Karkkainen, M. Koskinen, S. M. Reimann +1
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-…