期刊
PHYSICAL REVIEW B
卷 105, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.064508
关键词
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资金
- JSPS KAKENHI [19J01006]
- JSPS [18H05406]
- MEXT Leading Initiative for Excellent Young Researchers, JSPS KAKENHI [JP21K03436]
- Matsuo Foundation
- Grants-in-Aid for Scientific Research [19J01006] Funding Source: KAKEN
In this study, we theoretically investigate the optical spin transport properties in a topological Fermi superfluid, considering a one-dimensional system with an interspin p-wave interaction. Our findings reveal that the optical spin conductivity exhibits a spin-gapped spectrum in a wide parameter range and the gap closes at the Z(2) topological phase transition point.
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 p-wave interaction, which can be realized in ultracold-atom experiments. Developing the BCS-Leggett theory to describe the BCS to Bose-Einstein condensate (BEC) evolution and the 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 the 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 p-wave unitarity.
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