Singlet-triplet oscillations and far-infrared spectrum of four-minima quantum-dot molecule

Details Singlet-triplet oscillations and far-infrared spectrum of four-minima quantum-dot molecule Singlet-triplet oscillations and far-infrared spectrum of four-minima quantum-dot molecule

2004-08-09

arxiv.org/abs/cond-mat/0408178v1

Physica E 26, 286 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, QD2004 conference paper, accepted in Physica E

Scientific paper

10.1016/j.physe.2004.08.065

We study ground states and far-infrared spectra (FIR) of two electrons in four-minima quantum-dot molecule in magnetic field by exact diagonalization. Ground states consist of altering singlet and triplet states, whose frequency, as a function of magnetic field, increases with increasing dot-dot separation. When the Zeeman energy is included, only the two first singlet states remain as ground states. In the FIR spectra, we observe discontinuities due to crossing ground states. Non-circular symmetry induces anticrossings, and also an additional mode above $\omega_+$ in the spin-triplet spectrum. In particular, we conclude that electron-electron interactions cause only minor changes to the FIR spectra and deviations from the Kohn modes result from the low-symmetry confinement potential.

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