Canted phase in double quantum dots

David Sánchez, L. Brey, Gloria Platero
2001 Physical Review B (Condensed Matter)  
We perform a Hartree-Fock calculation in order to describe the ground state of a vertical double quantum dot in the absence of magnetic fields parallel to the growth direction. Intra- and interdot exchange interactions determine the singlet or triplet character of the system as the tunneling is tuned. At finite Zeeman splittings due to in-plane magnetic fields, we observe the continuous quantum phase transition from ferromagnetic to symmetric phase through a canted antiferromagnetic state. The
more » ... atter is obtained even at zero Zeeman energy for an odd electron number.
doi:10.1103/physrevb.64.235304 fatcat:ufp42nn3fzen5jlej7arikz6k4