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ID 55655
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Author
Mizushima, T. Department of Physics, Okayama University
Machida, K. Department of Physics, Okayama University
Abstract
We investigate how the vortex-vortex separation changes Majorana zero modes in the vicinity of the BCS-BEC (Bose-Einstein condensation) topological phase transition of p-wave resonant Fermi gases. By analytically and numerically solving the Bogoliubov-de Gennes equation for spinless p-wave superfluids with plural vortices, it is demonstrated that the quasiparticle tunneling between neighboring vortices gives rise to the quantum oscillation of the low-lying spectra on the scale of the Fermi wavelength in addition to the exponential splitting. This rapid oscillation, which appears in the weak-coupling regime as a consequence of quantum oscillations of quasiparticle wave functions, disappears in the vicinity of the BCS-BEC topological phase transition. This is understandable from that the wave function of the Majorana zero modes is described by the modified Bessel function in the strong-coupling regime, and thus it becomes spread over the vortex core region. Due to the exponential divergence of the modified Bessel function, the concrete realization of the Majorana zero modes near the topological phase transition requires the neighboring vortices to be separated beyond the length scale defined by the coherence length and the dimensionless coupling constant. All these behaviors are also confirmed by carrying out the full numerical diagonalization of the nonlocal Bogoliubov-de Gennes equation in a two-dimensional geometry. Furthermore, this argument is expanded into the case of three-vortex systems, where a pair of core-bound and edge-bound Majorana states survive at zero-energy state regardless of the vortex separation.
Note
This is an article published by American Physical Society
Published Date
2010-08
Publication Title
Physical Review A
Volume
volume82
Issue
issue2
Publisher
American Physical Society
Start Page
023624
ISSN
1050-2947
NCID
AA10764867
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
American Physical Society
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DOI
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isVersionOf https://doi.org/10.1103/PhysRevA.82.023624