900 citations · 4.4k across the 91 of their papers we have counts for
91 papers
Searching for Magnetostatic Modes in Spin-Polarized Atomic Hydrogen
Lauri Lehtonen, Otto Vainio, Janne Ahokas +4
We consider a possibility of the magnetostatic type spin waves driven by a long-range magnetic dipole interactions, to account for the peaks in the ESR spectra observed in our prev…
Spin Waves in Quantum Gases --- The Quality Factor of the Identical Spin Rotation Effect
L. Lehtonen, O. Vainio, J. Ahokas +6
Our recent experimental work on electron spin waves in atomic hydrogen gas has prompted a revisit of the theory of the Identical Spin Rotation Effect (ISRE). A key characteristic d…
Identical Spin Rotation Effect and Electron Spin Waves in Quantum Gas of Atomic Hydrogen
L. Lehtonen, O. Vainio, J. Ahokas +7
We present an experimental study of electron spin waves in atomic hydrogen gas compressed to high densities of cm at temperatures ranging from 0.26 t…
Parabolic model with phase-jump coupling
Jaakko Lehto, Kalle-Antti Suominen
We study the coherent dynamics of a two-level parabolic model and ways to enhance population transfer and even to obtain complete population inversion in such models. Motivated by…
Time-dependent two-level models and zero-area pulses
Jaakko Lehto, Kalle-Antti Suominen
Time-dependent two-level models have been an important element in physics, and in particular in quantum optics since 1930's. We review the basics of these models and focus on the d…
Analytic Vortex Dynamics in an Annular Bose-Einstein Condensate
L. A. Toikka, K. -A. Suominen
We consider analytically the dynamics of an arbitrary number and configuration of vortices in an annular Bose-Einstein condensate obtaining expressions for the free energy and vort…