Aharonov-Bohm rings with strong spin-orbit interaction: the role of sample-specific properties
Wieck, Andreas D.
- Journal Article
Rights / licenseCreative Commons Attribution 3.0 Unported
We present low-temperature transport experiments on Aharonov–Bohm (AB) rings fabricated from two-dimensional hole gases in p-type GaAs/AlGaAs heterostructures. Highly visible h/e (up to 15%) and h/2e oscillations, present for different gate voltages, prove the high quality of the fabricated devices. Like in previous work, a clear beating pattern of the h/e and h/2e oscillations is present in the magnetoresistance, producing split peaks in the Fourier spectrum. The magnetoresistance evolution is presented and discussed as a function of temperature and gate voltage. It is found that sample specific properties have a pronounced influence on the observed behaviour. For example, the interference of different transverse modes or the interplay between h/e oscillations and conductance fluctuations can produce the features mentioned above. In previous work they have occasionally been interpreted as signatures of spin–orbit interaction (SOI)-induced effects. In the light of these results, the unambiguous identification of SOI-induced phase effects in AB rings remains still an open and challenging experimental task. Show more
Journal / seriesNew Journal of Physics
Pages / Article No.
Organisational unit03439 - Ensslin, Klaus / Ensslin, Klaus
03833 - Wegscheider, Werner / Wegscheider, Werner
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