Magnetic field dependent transmission phase of a double dot system in a quantum ring

Details Magnetic field dependent transmission phase of a double dot system in a quantum ring Magnetic field dependent transmission phase of a double dot system in a quantum ring

2003-08-12

arxiv.org/abs/cond-mat/0308223v1

Phys. Rev. Lett. 93 (6) 66802 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.066802

The Aharonov-Bohm effect is measured in a four-terminal open ring geometry based on a Ga[Al]As heterostructure. 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. For example, phase lapses are found only in certain ranges of magnetic field.

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