Orbital Angular Momentum and Spectral Flow in Two-Dimensional Chiral Superfluids

Yasuhiro Tada, Wenxing Nie, and Masaki Oshikawa
Phys. Rev. Lett. 114, 195301 – Published 13 May 2015
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Abstract

We study the orbital angular momentum (OAM) Lz in two-dimensional chiral (px+ipy)ν-wave superfluids (SFs) of N fermions on a disk at zero temperature, in terms of spectral asymmetry and spectral flow. It is shown that Lz=νN/2 for any integer ν, in the Bose-Einstein condensation regime. In contrast, in the BCS limit, while the OAM is Lz=N/2 for the p+ip-wave SF, for chiral SFs with ν2, the OAM is remarkably suppressed as Lz=N×O(Δ0/ϵF)N, where Δ0 is the gap amplitude and ϵF is the Fermi energy. We demonstrate that the difference between the p+ip-wave SF and the other chiral SFs in the BCS regimes originates from the nature of edge modes and related depairing effects.

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  • Received 8 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.195301

© 2015 American Physical Society

Authors & Affiliations

Yasuhiro Tada1, Wenxing Nie2,1,*, and Masaki Oshikawa1

  • 1Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
  • 2Institute for Advanced Study, Tsinghua University, Beijing 100084, China

  • *Corresponding author. wenxing.nie@gmail.com

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Vol. 114, Iss. 19 — 15 May 2015

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