Microwave spectroscopy on a double quantum dot with an on-chip Josephson oscillator

Details Microwave spectroscopy on a double quantum dot with an on-chip Josephson oscillator Microwave spectroscopy on a double quantum dot with an on-chip Josephson oscillator

1999-10-06

arxiv.org/abs/cond-mat/9910076v2

New Journal of Physics 2 (2000) 2.1-2.7

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

10.1088/1367-2630/2/1/302

We present measurements on microwave spectroscopy on a double quantum dot with an on-chip microwave source. The quantum dots are realized in the two-dimensional electron gas of an AlGaAs/GaAs heterostructure and are weakly coupled in series by a tunnelling barrier forming an 'ionic' molecular state. We employ a Josephson oscillator formed by a long Nb/Al-AlO$_x$/Nb junction as a microwave source. We find photon-assisted tunnelling sidebands induced by the Josephson oscillator, and compare the results with those obtained using an externally operated microwave source.

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