Kreisbeck, Christoph and Kramer, Tobias and Buchholz, Sven S. and Fischer, Saskia F. and Kunze, Ulrich and Reuter, Dirk and Wieck, Andreas D. (2010) Phase shifts and phase pi jumps in four-terminal waveguide Aharonov-Bohm interferometers. PHYSICAL REVIEW B, 82 (16): 165329. ISSN 1098-0121,
Full text not available from this repository. (Request a copy)Abstract
Quantum coherent properties of electrons can be studied in Aharonov-Bohm (AB) interferometers. We investigate both experimentally and theoretically the transmission phase evolution in a four-terminal quasi-one- dimensional AlGaAs/GaAs-based waveguide AB ring. As main control parameter besides the magnetic field, we tune the Fermi wave number along the pathways using a top-gate. Our experimental results and theoretical calculations demonstrate the strong influence of the measurement configuration upon the AB-resistance- -oscillation phase in a four-terminal device. While the nonlocal setup displays continuous phase shifts of the AB oscillations, the phase remains rigid in the local voltage-probe setup. Abrupt phase jumps are found in all measurement configurations. We analyze the phase shifts as functions of the magnetic field and the Fermi energy and provide a detailed theoretical model of the device. Scattering and reflections in the arms of the ring are the source of abrupt phase jumps by pi.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NORMAL-METAL RINGS; QUANTUM-DOT; OSCILLATIONS; INTERFERENCE; TRANSMISSION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Alumni or Retired Professors > Group Tobias Kramer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Jul 2020 06:19 |
| Last Modified: | 08 Jul 2020 06:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24001 |
Actions (login required)
 |
View Item |
