Majorana states in helical Shiba chains and ladders

    Research output: Contribution to journalArticle

    88 Citations (Scopus)
    120 Downloads (Pure)

    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.
    Original languageEnglish
    Article number115109
    Pages (from-to)1-7
    JournalPhysical Review B
    Volume89
    Issue number11
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Fingerprint Dive into the research topics of 'Majorana states in helical Shiba chains and ladders'. Together they form a unique fingerprint.

    Cite this