Phys. Rev. Lett. 93, 066802 (2004) [4 pages]Magnetic-Field-Dependent Transmission Phase of a Double-Dot System in a Quantum RingReceived 8 August 2003; published 4 August 2004 The Aharonov-Bohm effect is measured in a four-terminal open ring geometry. Two quantum dots are embedded in the structure, one in each of the two interfering paths. The number of electrons in the two dots can be controlled independently. The transmission phase is measured as electrons are added to or taken away from the individual quantum dots. Although the measured phase shifts are in qualitative agreement with theoretical predictions, the phase evolution exhibits unexpected dependence on the magnetic field. Phase lapses are found only in certain ranges of the magnetic field. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.066802
DOI:
10.1103/PhysRevLett.93.066802
PACS:
73.21.La, 73.23.Hk
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