Detection of fractional solitons in quantum spin Hall systems. (8th May 2018)

• Record Type: Journal Article
• Authors: Fleckenstein, C.; Traverso Ziani, N.; Trauzettel, B.
• Is Part Of: Europhysics letters. Volume 121:Number 5(2018:Mar.)
• Publication Date: 2018-05-08
• Subjects: 73.23.-b -- 71.10.Pm -- 74.55.+v; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/121/57003
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: 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.