Ground-state angular momentum, spectral asymmetry, and topology in chiral superfluids and superconductors

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-05-10
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Language
en
Pages
1-10
Series
PHYSICAL REVIEW B, Volume 93, issue 17
Abstract
Recently, it was discovered that the ground-state orbital angular momentum in two-dimensional chiral superfluids with pairing symmetry (px+ipy)ν depends on the winding number ν in a striking manner. The ground-state value for the ν=1 case is Lz=N/2 as expected by counting the Cooper pairs, while a dramatic cancellation takes place for ν>1. The origin of the cancellation is associated with the topological edge states that appear in a finite geometry and give rise to a spectral asymmetry. Here, we study the reduction of orbital angular momentum for different potential profiles and pairing strengths, showing that the result Lz=N/2 is robust for ν=1 under all studied circumstances. We study how angular momentum depends on the gap size Δ/EF and obtain the result Lz=ν2N(1-μEF) for ν=2,3. Thus, the gap dependence of Lz for ν
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Ojanen , T 2016 , ' Ground-state angular momentum, spectral asymmetry, and topology in chiral superfluids and superconductors ' , Physical Review B , vol. 93 , no. 17 , 174505 , pp. 1-10 . https://doi.org/10.1103/PhysRevB.93.174505