Edge and bulk merons in double quantum dots with spontaneous interlayer   phase coherence
  We have investigated nucleation of merons in double quantum dots when a lateral distortion with a reflection symmetry is present in the confinement potential. We find that merons can nucleate both inside and at the edge of the dots. In addition to these merons, our results show that electron density modulations can be also present inside the dots. An edge meron appears to have approximately a half integer winding number. 
S.-R. Eric Yang and N.Y. Hwang