Volume 121, Number 5, March 2018
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 May 2018|
Detection of fractional solitons in quantum spin Hall systems
Institute for Theoretical Physics and Astrophysics, University of Würzburg - D-97074 Würzburg, Germany
Received: 13 February 2018
Accepted: 11 April 2018
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.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 74.55.+v – Tunneling phenomena: single particle tunneling and STM
© EPLA, 2018
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