Piezoelectric surface acoustic waves (SAWs) are powerful for investigating and controlling
elementary and collective excitations in condensed matter. In semiconductor two …

Superfluid helium's low-loss dielectric properties, excellent thermal conductivity, and unique
collective excitations make it an attractive candidate to incorporate into superconducting …

Superconducting qubits, mesoscopic superconducting circuits with a single quantum co-
herent degree of freedom, have emerged as both a promising platform for quantum compu …

Electron systems in low dimensions are enriched with many superior properties for both
fundamental research and technical developments. Wide tunability of electron density, high …

Positive and negative ions in superfluid 4 He (He II) are interesting objects of experimental
and theoretical research and serve as important probes to study various aspects of …

We report on low-temperature noise measurements of a single electron transistor (SET)
immersed in superfluid 4 He. The device acts as a charge sensitive electrometer able to …

Piezoelectric surface acoustic waves (SAWs) are powerful for investigating and controlling
elementary and collective excitations in condensed matter. In semiconductors SAWs have …

Superfluid helium at milli-Kelvin temperatures is a dielectric liquid with an extremely low loss
tangent at microwave frequencies. As such, it is a promising candidate for incorporation into …

This thesis describes novel methods and experiments for investigating electrons floating on
the surface of liquid helium by utilizing surface acoustic wave (SAW) techniques. Electrons …

In this chapter we present a paradigm of cavity optomechanics with thin films of superfluid
helium. Two-dimensional superfluid films offer a number of desirable properties for both …