Spontaneous splitting of a quadruply charged vortex (2007)
Isoshima, T, Okano, M, Yasuda, H, Kasa, K, Huhtamaki, JAM, Kumakura, M, ...
Stability and dynamics of vortex clusters in nonrotated Bose-Einstein condensates (2007)
Pietila, V., Mottonen, M., Isoshima, T., Huhtamaki, J. A. M., Virtanen, S. M. M.
We study stationary clusters of vortices and antivortices in dilute pancake-shaped Bose-Einstein condensates confined in nonrotating harmonic traps. Previous theoretical results on the stability...
Splitting times of doubly quantized vortices in dilute Bose-Einstein condensates (2006)
Huhtamäki, J. A. M., Möttönen, M., Isoshima, T., Pietilä, V., Virtanen, S. M. M.
Recently, the splitting of a topologically created doubly quantized vortex into two singly quantized vortices was experimentally investigated in dilute atomic cigar-shaped Bose-Einstein condensates...
Collective Oscillations of Vortex Lattices in Rotating Bose-Einstein Condensates (2003)
Mizushima, T., Kawaguchi, Y., Machida, K., Ohmi, T., Isoshima, T., Salomaa, M. M.
The complete low-energy collective-excitation spectrum of vortex lattices is discussed for rotating Bose-Einstein condensates (BEC) by solving the Bogoliubov-de Gennes (BdG) equation, yielding, e.g.,...
Splitting of a doubly quantized vortex through intertwining in Bose-Einstein condensates (2003)
Mottonen, M., Mizushima, T., Isoshima, T., Salomaa, M. M., Machida, K.
The stability of doubly quantized vortices in dilute Bose-Einstein condensates of 23Na is examined at zero temperature. The eigenmode spectrum of the Bogoliubov equations for a harmonically trapped...
Development of a Hybrid Scanning Near-Field Optical/Tunneling Microscope (SNOM/STM) System (1999)
Nakajima, K., Micheletto, R., Mitsui, K., Isoshima, T., Hara, M., Wada, T., ...
Low-lying Quasiparticle Excitations around a Vortex Core in Quantum Limit (1998)
Hayashi, N., Isoshima, T., Ichioka, M., Machida, K.
Focusing on a quantum-limit behavior, we study a single vortex in a clean s-wave type-II superconductor by self-consistently solving the Bogoliubov-de Gennes equation. The discrete energy levels of...