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

Abstract

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.

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

References in corpus (7)

• Persistent currents in normal metal rings
• Aharanov-Bohm excitons at elevated temperatures in type-II ZnTe/ZnSe quantum dots
• Optical Aharonov-Bohm effect in stacked type-II quantum dots
• Excitonic Aharonov-Bohm Effect in Isotopically Pure 70Ge/Si Type-II Quantum Dots
• Non-circular semiconductor nanorings of type I and II: Emission kinetics in the exciton Aharonov-Bohm effect
• Coherent Aharonov Bohm oscillations in type-II (ZnMn)Te quantum dots
• Aharonov-Bohm Oscillations in Photoluminescence from Charged Exciton in Quantum Tubes

Cited by in corpus (4)

• Patterns of the Aharonov-Bohm oscillations in graphene nanorings
• Topology driven g-factor tuning in type-II quantum dots
• Artificial versus Natural Atoms: The uncanny capability of the many-body Schrödinger equation to produce emergent behavior
• Magneto-Optical Quantum Switching in a System of Spinor Excitons