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Spontaneously broken time-reversal symmetry in quantum dots.

Steffens, Oliver ; Rössler, Ulrich ; Suhrke, Michael
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Date of publication of this fulltext: 05 Aug 2009 13:28


Abstract

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.


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