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