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.
@article{arxiv.1002.2393,
title = {Excitonic Aharonov-Bohm Effect in Isotopically Pure 70Ge/Si Type-II Quantum Dots},
author = {Satoru Miyamoto and Oussama Moutanabbir and Toyofumi Ishikawa and Mikio Eto and Eugene E. Haller and Kentarou Sawano and Yasuhiro Shiraki and Kohei M. Itoh},
journal= {arXiv preprint arXiv:1002.2393},
year = {2015}
}