Beating of Aharonov-Bohm oscillations in a closed-loop interferometer

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dc.creatorJo, Sanghyun
dc.creatorKhym, Gyong Luck
dc.creatorChang, Dong-In
dc.creatorChung, Yunchul
dc.creatorLee, Hu-Jong
dc.creatorKang, Kicheon
dc.creatorMahalu, Diana
dc.creatorUmansky, Vladimir
dc.date2008-06-10
dc.date.accessioned2026-07-07T09:43:34Z
dc.date.available2026-07-07T09:43:34Z
dc.descriptionOne of the points at issue with closed-loop-type interferometers is beating in the Aharonov-Bohm (AB) oscillations. Recent observations suggest the possibility that the beating results from the Berry-phase pickup by the conducting electrons in materials with the strong spin-orbit interaction (SOI). In this study, we also observed beats in the AB oscillations in a gate-defined closed-loop interferometer fabricated on a GaAs/AlGaAs two-dimensional electron-gas heterostructure. Since this heterostructure has very small SOI, the picture of the Berry-phase pickup is ruled out. The observation of beats in this study, with the controllability of forming a single transverse subband mode in both arms of our gate-defined interferometer, also rules out the often-claimed multiple transverse subband effect. It is observed that nodes of the beats with an h/2e period exhibit a parabolic distribution for varying the side gate. These results are shown to be well interpreted, without resorting to the SOI effect, by the existence of two-dimensional multiple longitudinal modes in a single transverse subband. The Fourier spectrum of measured conductance, despite showing multiple h/e peaks with the magnetic-field dependence that are very similar to that from strong-SOI materials, can also be interpreted as the two-dimensional multiple-longitudinal-modes effect.
dc.identifierhttps://arxiv.org/abs/0806.1595
dc.identifierhttp://arxiv.org/abs/0806.1595
dc.identifierPhysical Review B 76, 035110 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.035110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162609
dc.subjectMesoscale and Nanoscale Physics
dc.titleBeating of Aharonov-Bohm oscillations in a closed-loop interferometer
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