Title
Electronic properties of emergent topological defects in chiral p-wave superconductivity Electronic properties of emergent topological defects in chiral p-wave superconductivity
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y :American Physical Society ,
Subject
Physics
Source (journal)
Physical review B / American Physical Society. - New York, N.Y, 2016, currens
Volume/pages
94(2016) :2 , 13 p.
ISSN
2469-9969
2469-9969
Article Reference
024520
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Chiral p-wave superconductors in applied magnetic field can exhibit more complex topological defects than just conventional superconducting vortices, due to the two-component order parameter (OP) and the broken time-reversal symmetry. We investigate the electronic properties of those exotic states, some of which contain clusters of one-component vortices in chiral components of the OP and/or exhibit skyrmionic character in the relative OP space, all obtained as a self-consistent solution of the microscopic Bogoliubov-de Gennes equations. We reveal the link between the local density of states (LDOS) of the novel topological states and the behavior of the chiral domain wall between the OP components, enabling direct identification of those states in scanning tunneling microscopy. For example, a skyrmion always contains a closed chiral domain wall, which is found to be mapped exactly by zero-bias peaks in LDOS. Moreover, the LDOS exhibits electron-hole asymmetry, which is different from the LDOS of conventional vortex states with same vorticity. Finally, we present the magnetic field and temperature dependence of the properties of a skyrmion, indicating that this topological defect can be surprisingly large in size, and can be pinned by an artificially indented nonsuperconducting closed path in the sample. These features are expected to facilitate the experimental observation of skyrmionic states, thereby enabling experimental verification of chirality in emerging superconducting materials.
E-info
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/23d0f8/135742.pdf
Handle