Excitonic Aharonov-Bohm Effect in Isotopically Pure 70Ge/Si Type-II Quantum Dots

Abstract

We report on a magneto-photoluminescence study of isotopically pure 70Ge/Si self-assembled type-II quantum dots. Oscillatory behaviors attributed to the Aharonov-Bohm effect are simultaneously observed for the emission energy and intensity of excitons subject to an increasing magnetic field. When the magnetic flux penetrates through the ring-like trajectory of an electron moving around each quantum dot, the ground state of an exciton experiences a change in its angular momentum. Our results provide the experimental evidence for the phase coherence of a localized electron wave function in group-IV Ge/Si self-assembled quantum structures.

4 pages, 4 figures

References in corpus (4)

• Aharanov-Bohm excitons at elevated temperatures in type-II ZnTe/ZnSe quantum dots
• Optical Aharonov-Bohm effect in stacked type-II quantum dots
• 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 (5)

• Optical Aharonov-Bohm Effect on Wigner Molecules in Type-II Semiconductor Quantum Dots
• Topology driven g-factor tuning in type-II quantum dots
• Electric and magnetic fields effects on the excitonic properties of elliptic core-multishell quantum wires
• Nuclear Spin-Depleted, Isotopically Enriched 70Ge/28Si70Ge Quantum Wells
• Vanishing Zeeman energy in a two-dimensional hole gas