談話会・セミナー

第3回 物理工学科教室談話会 (講師:Prof. Amnon Aharony)
2012.03.08

日 時: 2012年3月8日(木)16:00~
場 所: 大会議室(工6号館1階103号室)
講演者: Prof. Amnon Aharony(Ben Gurion University and Tel Aviv University, Israel)
題 目: Aharonov-Bohm interferometry with tunnel-coupled wires
概 要:
Yamamoto et al. have presented several experimental results on three-terminal systems, in which the currents exit through two terminals, attached to two wires which are coupled via a controllable tunneling. The electrons either enter into one of the wires, or enter into an Aharonov-Bohm ring and then exit through these wires. The whole system is penetrated by a magnetic flux. In this talk I shall present preliminary theoretical results, in which the wires are modeled by a ladder of tight-binding bonds, with a varying hopping energy on the rungs. The model reproduces many of the experimental results, e.g. the `in-phase’ and `anti-phase’ variation of the peaks in the outgoing currents as functions of the flux and of the inter-wire tunneling strength, and the Fourier spectra of these oscillations. In some cases, the theory yields a qualitative explanation of the observed phenomena.

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