Majorana states in helical Shiba chains and ladders

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Date
2014
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
1-7
Series
PHYSICAL REVIEW B, Volume 89, issue 11
Abstract
Motivated by recent proposals to realize Majorana bound states in chains and arrays of magnetic atoms deposited on top of a superconductor, we study the topological properties of various chain structures, ladders, and two-dimensional arrangements exhibiting magnetic helices. We show that magnetic domain walls where the chirality of a magnetic helix is inverted support two protected Majorana states giving rise to a tunneling conductance peak twice the height of a single Majorana state. The topological properties of coupled chains exhibit nontrivial behavior as a function of the number of chains beyond the even-odd dichotomy expected from the simple Z2 nature of coupled Majorana states. In addition, it is possible that a ladder of two or more coupled chains exhibit Majorana edge states even when decoupled chains are trivial. We formulate a general criterion for the number of Majorana edge states in multichain ladders and discuss some experimental consequences of our findings.
Description
Keywords
Other note
Citation
Pöyhönen , K , Westström , A , Röntynen , J & Ojanen , T 2014 , ' Majorana states in helical Shiba chains and ladders ' , Physical Review B , vol. 89 , no. 11 , 115109 , pp. 1-7 . https://doi.org/10.1103/PhysRevB.89.115109