Piezoacoustics for precision control of electrons floating on helium

Abstract

Piezoelectric surface acoustic waves (SAWs) are powerful for investigating and controlling elementary and collective excitations in condensed matter. In semiconductor two-dimensional electron systems SAWs have been used to reveal the spatial and temporal structure of electronic states, produce quantized charge pumping, and transfer quantum information. In contrast to semiconductors, electrons trapped above the surface of superfluid helium form an ultra-high mobility, two-dimensional electron system home to strongly-interacting Coulomb liquid and solid states, which exhibit non-trivial spatial structure and temporal dynamics prime for SAW-based experiments. Here we report on the coupling of electrons on helium to an evanescent piezoelectric SAW. We demonstrate precision acoustoelectric transport of as little as ~0.01% of the electrons, opening the door to future quantized charge pumping experiments. We also show SAWs are a route to investigating the high-frequency dynamical response, and relaxational processes, of collective excitations of the electronic liquid and solid phases of electrons on helium.

Main manuscript: 15 pages, 3 figures; Supplemental Information: 11 pages, 3 figures, 1 table

References in corpus (6)

• Propagating phonons coupled to an artificial atom
• Photon-induced vanishing of magnetoconductance in 2D electrons on liquid He
• Coupling between Rydberg states and Landau levels of electrons trapped on liquid helium
• Charge metastability and hysteresis in the quantum Hall regime
• Mobility of a spatially modulated electron liquid on the helium surface
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• Decoherence of surface phonons in a quantum acoustic system
• Plasmon Mode Engineering with Electrons on Helium
• Frequency-modulated enhancement of microwave resonator sensing
• Optimization of conveyance of quantum particles by moving potential well