Acoustic phonon-based interaction between coplanar quantum circuits in magnetic field

TL;DR

This study investigates how acoustic phonons mediate interactions between neighboring coplanar quantum circuits with quantum point contacts under a perpendicular magnetic field, revealing magnetic field-controlled phonon emission regions.

Contribution

It demonstrates magnetic field influence on phonon-mediated interactions in quantum circuits, providing insights into non-equilibrium transport mechanisms involving skipping orbits.

Findings

Induced current sign depends on magnetic field polarity.

Phonon emission regions are controlled by magnetic field.

Interaction mechanism involves non-equilibrium transport via skipping orbits.

Abstract

We explore the acoustic phonon-based interaction between two neighboring coplanar circuits containing semiconductor quantum point contacts in a perpendicular magnetic field B. In a drag-type experiment, a current flowing in one of the circuits (unbiased) is measured in response to an external current in the other. In moderate B the sign of the induced current is determined solely by the polarity of B. This indicates that the spatial regions where the phonon emission/reabsorption is efficient are controlled by magnetic field. The results are interpreted in terms of non-equilibrium transport via skipping orbits in two-dimensional electron system.