Spontaneously broken time-reversal symmetry in quantum dots
Institut für Theoretische Physik, Universität Regensburg - D-93040 Regensburg, Germany
Accepted: 4 September 1998
We present current-spin density-functional calculations for circular parabolic quantum dots in zero magnetic field. We find the possibility for broken time-reversal symmetry via exchange correlation with spontaneously induced orbital currents. For certain electron numbers, this results in new current textures which give rise to a finite magnetization even for ground states with vanishing total angular momentum.
PACS: 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilattices) / 71.15.Mb – Density functional theory, local density approximation / 73.23.-b – Mesoscopic systems
© EDP Sciences, 1998