Transport characteristics of a window-coupled in-plane-gated wire system

Y. Hirayama, Y. Tokura, A. D. Wieck, S. Koch, R. J. Haug, K. Von Klitzing, K. Ploog

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20 Citations (Scopus)


Low-temperature (T50 mK) transport characteristics are measured for parallel wires coupled by a ballistic window. The structure is fabricated by focused Ga ion-beam scanning and subsequent annealing. The size of the structure is modified by in-plane-gated operation. At zero magnetic field, the transport characteristics are governed by the mode matching between one-dimensional modes in the wires and quasi-zero-dimensional modes in the window. When four-terminal resistance is measured as a function of in-plane-gate voltage, a small period oscillation is superimposed on the background oscillation corresponding to the subband population in each wire. At intermediate magnetic fields, Aharonov-Bohm interference effects are observed in both the magnetic field and the in-plane-gate voltage dependence. These originate from the circulating channel in the window. Theoretical calculations essentially reproduce the experimental results, supporting these explanations.

Original languageEnglish
Pages (from-to)7991-7998
Number of pages8
JournalPhysical Review B
Issue number11
Publication statusPublished - 1993


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