We have investigated the Aharonov-Bohm effect in mesoscopic semiconductor GaAs/GaAlAs rings in low magnetic fields. The oscillatory magnetoconductance of these systems is systematically studied as a function of electron density. We observe phase shifts of π in the magnetoconductance oscillations, and halving of the fundamental h/e period, as the density is varied. Theoretically, we find agreement with the experiment, by introducing an asymmetry between the two arms of the ring.
|Tidsskrift||Physica E: Low-Dimensional Systems and Nanostructures|
|Status||Udgivet - maj 2000|
|Begivenhed||MSS9: The 9th International Conference on Modulated Semiconductor Structures - Fukuoka, Jpn|
Varighed: 12 jul. 1999 → 16 jul. 1999
|Konference||MSS9: The 9th International Conference on Modulated Semiconductor Structures|
|Periode||12/07/1999 → 16/07/1999|
|Sponsor||Association for Promotion of Electrical and Information Eng., et al., Fukuoka Prefecture, International Communications Foundation, Technology Research Foundation|