Effect of nanoholes on the vortex core fermion spectrum and heat transport in p-wave superconductors.

TitleEffect of nanoholes on the vortex core fermion spectrum and heat transport in p-wave superconductors.
Publication TypeJournal Article
Year of Publication2013
AuthorsRosenstein B, Shapiro I, Shapiro YB
JournalJournal of physics. Condensed matter : an Institute of Physics journal
Volume25
Issue7
Pagination075701
Date Published2013 Feb 20
Abstract

The spectrum of core excitations of the Abrikosov vortex pinned by a nanohole of the size of the coherence length is considered. While the neutral zero energy Majorana core state remains intact due to its topological origin, the energy of charged excitations is significantly enhanced compared to that in the unpinned vortex. As a consequence of the pinning the minigap separating the Majorana state from the charged levels increases from Δ(2)/E(F) (E(F) is the Fermi energy and Δ is the bulk p-wave superconducting gap) to a significant fraction of Δ. Suppression of the thermodynamic and kinetic effects of the charged excitations allows us to isolate the Majorana state so it can be used for quantum computation. It is proposed that thermal conductivity along the vortex cores is a sensitive method to demonstrate the minigap. Using the Butticker-Landauer-Kopnin formula, we calculate the thermal conductance beyond the linear response as a function of the hole radius.

DOI10.1167/iovs.12-10847
Alternate JournalJ Phys Condens Matter