Coulomb oscillations of conductance in an open ring interferometer in a strong magnetic field |
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Authors: | A A Bykov D V Nomokonov A K Bakarov O Estibals J C Portal |
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Institution: | (1) Institute of Semiconductor Physics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia;(2) Grenoble High Magnetic Fields Laboratory, MPI-FKF and CNRS B.P.166, F-38042 Grenoble, France |
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Abstract: | Under the conditions corresponding to tunnel-coupled edge current states in an open ring interferometer, oscillations of conductance as a function of gate voltage with two noticeably different periods are observed. The large-period oscillations are attributed to the electron tunneling between the source and drain regions via a closed edge state of the ring, when an integral number of magnetic flux quanta passes through its contour at the Fermi level. The small-period oscillations are explained by the effect of single-electron variations of the ring potential on the transparency of the barriers between the localized and delocalized edge states of the interfer-ometer. |
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