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Chiral Topological Superconductors Enhanced by Long-Range Interactions.
Oscar Viyuela1,2,3, Liang Fu1, Miguel Angel Martin-Delgado2
1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|January 20, 2018
Summary
Long-range interactions in two-dimensional p-wave superconductors reveal new topological phases and Majorana quasiparticles. These novel states, particularly nonlocal edge states, offer enhanced robustness and potential applications in superconductivity experiments.
Area of Science:
- Condensed Matter Physics
- Topological Materials Science
Background:
- Two-dimensional p-wave superconductors host exotic topological phases and Majorana edge states.
- Conventional models typically assume short-range interactions, limiting the understanding of realistic systems.
Purpose of the Study:
- Investigate the impact of long-range hopping and pairing amplitudes on the phase diagram and edge states of 2D p-wave superconductors.
- Identify novel topological phases and quasiparticles arising from these long-range effects.
Main Methods:
- Theoretical modeling of a 2D p-wave superconductor incorporating long-range interactions.
- Analysis of the system's phase diagram and the properties of its edge states.
Main Results:
- Discovery of new topological phases and quasiparticles distinct from short-range models.
- Enhancement of topological chiral phases with propagating Majorana edge states when hopping and pairing decay similarly.
- Identification of new topological phases with nonlocally pairing, gapped Majorana edge states when pairing decays slower than hopping.
Conclusions:
- Long-range interactions significantly modify the topological properties of 2D p-wave superconductors.
- Novel nonlocal Majorana edge states are robust, bulk-separated, and simultaneously localized at both edges.
- Findings have potential applications for recent experiments involving magnetic impurities and islands in 2D superconductors.
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