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 tunneling barrier forming an ’ionic’ molecular state. As a microwave source we employ a Josephson oscillator formed by a long Nb/Al-AlOx/Nb junction. W...

We present measurements on microwave spectroscopy on a double quantum dot with a near-field 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 tunneling barrier forming an 'ionic' molecular state. As a microwave source we employ a Josephson oscillator formed by a long Nb/Al-AlO x /Nb junctio...

This paper presents experimental characterization of plasmoids (fireballs) obtained by directing localized microwave power (<1 kW at 2.45 GHz) onto a silicon-based substrate in a microwave cavity. The plasmoid emerges up from the hotspot created in the solid substrate into the air within the microwave cavity. The experimental diagnostics employed for the fireball characterization in this study ...

It is easy to set a frisbee spinning but hard to flip a javelin end-over-end. The properties of a rotating body are determined by its moment of inertia. Changes in the energy associated with the rotation of a single molecule are incremental, or quantized, in contrast with the everyday examples of the frisbee and the javelin. Only photons with energies that correspond to specific discrete freque...

The history and development of microwave spectroscopy and nuclear magnetic resonance (NMR) spectroscopy have much in common. In this Account, we discuss the less widely appreciated connections between the parameters measured using the two techniques. Selected examples from our laboratory and from the recent literature attest to the utility and importance of these connections. For example, how a...

Recently we showed that microwave (MW) double resonance experiments can be performed with microwave Fourier transform (MWFT) techniques [1]. In our first experiments we used a continuous microwave (CW) pump radiation. One observation is that the transient emission signal in the presence of a CW p u m p radiation decays faster. This results in an additional line broadening, as can be seen in Fig...