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- W3203659816 abstract "We theoretically investigate optical (frequency-dependent) bulk spin transport properties in a spin-1/2 topological Fermi superfluid. We specifically consider a one-dimensional system with an interspin {it p}-wave interaction, which can be realized in ultracold atom experiments. Developing the BCS-Leggett theory to describe the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) evolution and the $mathbb{Z}_2$ topological phase transition in this system, we show how the spin transport reflects these many-body aspects. We find that the optical spin conductivity, which is a small AC response of a spin current, shows the spin gapped spectrum in the wide parameter region and the gap closes at $mathbb{Z}_2$ topological phase transition point. Moreover, the validity of the low-energy effective model of the Majorana zero mode is discussed along the BCS-BEC evolution in connection with the scale invariance at {it p}-wave unitarity." @default.
- W3203659816 created "2021-10-11" @default.
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- W3203659816 date "2022-02-16" @default.
- W3203659816 modified "2023-10-15" @default.
- W3203659816 title "Optical spin transport theory of spin- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> topological Fermi superfluids" @default.
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- W3203659816 doi "https://doi.org/10.1103/physrevb.105.064508" @default.
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