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23 papers · 1 filter
Radial fluctuations induced stabilization of the ordered state in two dimensional classical clusters
I. V. Schweigert, V. A. Schweigert, F. M. Peeters
Melting of two dimensional (2D) clusters of classical particles is studied using Brownian dynamics and Langevin molecular dynamics simulations. The particles are confined by a circ…
Condensation and interaction range in harmonic boson traps: a variational approach
J. Tempere, F. Brosens, L. F. Lemmens +1
For a gas of N bosons interacting through a two-body Morse potential a variational bound of the free energy of a confined system is obtained. The calculation method is based on the…
Vortex Matter in Mesoscopic Superconducting Disks and Rings
F. M. Peeters, V. A. Schweigert, B. J. Baelus +1
Phase transitions between different (i.e. giant and multi-vortex) superconducting states and between the superconducting-normal state of mesoscopic disks and rings are studied in t…
Transitions between different superconducting states in mesoscopic disks
V. A. Schweigert, F. M. Peeters
Using a linear analysis, we study the stability of giant-vortex states in very thin disks. The vortex expulsion and penetration fields are obtained for finite thickness disks from…
Confinement of two-dimensional excitons in a non-homogeneous magnetic field
J. A. K. Freire, A. Matulis, F. M. Peeters +2
The effective Hamiltonian describing the motion of an exciton in an external non-homogeneous magnetic field is derived. The magnetic field plays the role of an effective potential…
Vortex states in superconducting rings
B. J. Baelus, F. M. Peeters, V. A. Schweigert
The superconducting state of a thin superconducting disk with a hole is studied within the non-linear Ginzburg-Landau theory in which the demagnetization effect is accurately taken…