We present a new mechanical probe to study the properties of superfluid 3He at microkelvin temperatures down to 100μK. The setup consists of a set of coils for levitating a superconducting sphere and controlling its motion in a wide variety of regimes. In particular, the realisation of motion of a levitating body at a uniform velocity presents both an experimental challenge and a promising direction into the study of the edge states in topological superfluid 3He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system.
@article{arxiv.2107.07858,
title = {Design of a system for controlling a levitating sphere in superfluid $^3$He at extremely low temperatures},
author = {M. Arrayás and José L. Trueba and Carlos Uriarte and Dmitry E. Zmeev},
journal= {arXiv preprint arXiv:2107.07858},
year = {2021}
}