We propose two experimental setups that allow for the implementation and the detection of fractional solitons of the Goldstone-Wilczek type. The first setup is based on two magnetic barriers at the edge of a quantum spin Hall system for generating the fractional soliton. If then a quantum point contact is created with the other edge, the linear conductance shows evidence of the fractional soliton. The second setup consists of a single magnetic barrier covering both edges and implementing a long quantum point contact. In this case, the fractional soliton can unambiguously be detected as a dip in the conductance without the need to control the magnetization of the barrier.
@article{arxiv.1802.05436,
title = {Detection of fractional solitons in quantum spin Hall systems},
author = {C. Fleckenstein and N. Traverso Ziani and B. Trauzettel},
journal= {arXiv preprint arXiv:1802.05436},
year = {2018}
}