Ground state and far-infrared absorption of two-electron rings in a magnetic field - art. no. 125334

Motivated by recent experiments [A. Lorke et al., Phys. Rev. Lett. 84, 2223 (2000)] an analysis of the ground state and far-infrared absorption of two electrons confined in a quantum ring is presented. The height of the repul sive central barrier in the confining potential is shown to influence, in a n important way, the ring properties. The experiments an best explained ass uming the presence of both high- and low-barrier quantum rings in the sampl e. The formation of a two-electron Wigner molecule in certain cases is disc ussed.