Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-10-25
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 3 figures; longer version of the paper, to appear in PRB
Scientific paper
In a variety of rare-earth based compounds singlet superconductivity coexists with helical magnetism. Here we demonstrate that surfaces of these systems should generically host a finite density of zero-energy Majorana modes. In the limit of vanishing disorder, these modes lead to a divergent contribution to zero-energy density of states and to zero-temperature entropy proportional to the sample surface area. When confined to a wire geometry, a discrete number of Majorana modes can be isolated. The relatively large characteristic energy scales for superconductivity and magnetism, compared to other proposals, as well as the lack of need for fine-tuning, make helical magnetic superconducting compounds favorable for the observation and experimental investigation of Majorana fermions.
Martin Ivar
Morpurgo Alberto F.
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