Ultra-high Aharonov_CBohm oscillations harmonics in a small ring interferometer

摘要

We report on the observation of ultra-high Aharonov_CBohm oscillations harmonics h/ne (n = 40_C45)in a very small quasibalistic ring (the ring effective radius is r = 60_C75 nm) fabricated on the basisof AlGaAs/GaAs heterostructures with a 2D electron gas. The highest harmonics observed so far weren = 2_C4. The observation of harmonics of so high a frequency proves that in real scattering systemswith dimensions of the order of the electron wave-length, multiple back-scattering processes are quitecommon.