Theory of spin, electronic and transport properties of the lateral triple quantum dot molecule in a magnetic field

Details Theory of spin, electronic and transport properties of the lateral triple quantum dot molecule in a magnetic field Theory of spin, electronic and transport properties of the lateral triple quantum dot molecule in a magnetic field

2007-07-11

arxiv.org/abs/0707.1687v1

Phys. Rev. B 76, 115332 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

30 pages (one column), 9 figures

Scientific paper

10.1103/PhysRevB.76.115332

We present a theory of spin, electronic and transport properties of a few-electron lateral triangular triple quantum dot molecule in a magnetic field. Our theory is based on a generalization of a Hubbard model and the Linear Combination of Harmonic Orbitals combined with Configuration Interaction method (LCHO-CI) for arbitrary magnetic fields. The few-particle spectra obtained as a function of the magnetic field exhibit Aharonov-Bohm oscillations. As a result, by changing the magnetic field it is possible to engineer the degeneracies of single-particle levels, and thus control the total spin of the many-electron system. For the triple dot with two and four electrons we find oscillations of total spin due to the singlet-triplet transitions occurring periodically in the magnetic field. In the three-electron system we find a transition from a magnetically frustrated to the spin-polarized state. We discuss the impact of these phase transitions on the addition spectrum and the spin blockade of the lateral triple quantum dot molecule.

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