Majorana states in helical Shiba chains and ladders

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Majorana states in helical Shiba chains and ladders. / Pöyhönen, Kim; Westström, Alex; Röntynen, Joel; Ojanen, Teemu.

In: Physical Review B, Vol. 89, No. 11, 115109, 2014, p. 1-7.

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@article{70cdfc48e34d447eacea1e0b0c2c9b2b,
title = "Majorana states in helical Shiba chains and ladders",
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.",
author = "Kim P{\"o}yh{\"o}nen and Alex Weststr{\"o}m and Joel R{\"o}ntynen and Teemu Ojanen",
year = "2014",
doi = "10.1103/PhysRevB.89.115109",
language = "English",
volume = "89",
pages = "1--7",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "11",

}

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TY - JOUR

T1 - Majorana states in helical Shiba chains and ladders

AU - Pöyhönen, Kim

AU - Westström, Alex

AU - Röntynen, Joel

AU - Ojanen, Teemu

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevB.89.115109

DO - 10.1103/PhysRevB.89.115109

M3 - Article

VL - 89

SP - 1

EP - 7

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 11

M1 - 115109

ER -

ID: 882485