Optical Aharonov-Bohm Effect on Wigner Molecules in Type-II Semiconductor Quantum Dots

Details Optical Aharonov-Bohm Effect on Wigner Molecules in Type-II Semiconductor Quantum Dots Optical Aharonov-Bohm Effect on Wigner Molecules in Type-II Semiconductor Quantum Dots

2011-03-25

arxiv.org/abs/1103.4921v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 10 figures, accepted for publication in Phys. Rev. B

Scientific paper

We theoretically examine the magnetoluminescence from a trion and a biexciton in a type-II semiconductor quantum dot, in which holes are confined inside the quantum dot and electrons are in a ring-shaped region surrounding the quantum dot. First, we show that two electrons in the trion and biexciton are strongly correlated to each other, forming a Wigner molecule: Since the relative motion of electrons is frozen, they behave as a composite particle whose mass and charge are twice those of a single electron. As a result, the energy of the trion and biexciton oscillates as a function of magnetic field with half the period of the single-electron Aharonov-Bohm oscillation. Next, we evaluate the photoluminescence. Both the peak position and peak height change discontinuously at the transition of the many-body ground state, implying a possible observation of the Wigner molecule by the optical experiment.

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