Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-01-15
Phys. Rev. B 75, 245328 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
minor changes included, accepted in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.75.245328
Adiabatic time evolution of degenerate eigenstates of a quantum system provides a means for controlling electronic states since mixing between degenerate levels generates a matrix Berry phase. In the presence of spin-orbit coupling in n-type semiconductor quantum dots the electron Hamiltonian is invariant under time reversal operation and the many body groundstate may be doubly degenerate. This double degeneracy can generate non-Abelian vector potentials when odd number of electrons are present. We find that the antisymmetry of many electron wavefunction has no effect on the matrix Berry phase. We have derived equations that allow one to investigate the effect of electron correlations by expressing the non-Abelian vector potentials for many electron system in terms of single electron non-Abelian vector potentials.
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