Abstract
We theoretically investigate optical Aharonov-Bohm (AB) effects on trion and biexciton in the type-II semiconductor quantum dots, in which holes are localized near the center of the dot, and electrons are confined in a ring structure formed around the dot. Many-particle states are calculated numerically by the exact diagonalization method. Two electrons in trion and biexciton are strongly correlated to each other, forming a Wigner molecule. Since the relative motion of electrons are frozen, the Wigner molecule behaves as a composite particle whose mass and charges are twice those of an electron. As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring. We find that the magnetoluminescence spectra from trion and biexciton change discontinuously as the magnetic flux increases by h/2e.PACS: 71.35.Ji, 73.21.-b, 73.21.La, 78.67.Hc
Highlights
Rapid advance in nanotechnology has allowed us to fabricate ring structures whose circumference is shorter than the phase coherent length
We show that the peak position and intensity of the luminescence change discontinuously as F increases by h/2e. This indicates the possible observation of Wigner molecules by the optical experiment
We have found that two electrons in trion and biexciton form a Wigner molecule
Summary
Rapid advance in nanotechnology has allowed us to fabricate ring structures whose circumference is shorter than the phase coherent length. The angular momentum increases with in the ground state, and the energy oscillates as a function of F by the period of h/e [1]. This AB effect was observed experimentally as the B dependence of peak position of luminescence from excitons [4,5], in which the hole motion is almost frozen due to the strong confinement [6].
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