arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.7459cond-mat.supr-con
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二维手征超流体中的轨道Angular Momentum和谱流

Orbital Angular Momentum and Spectral Flow in Two Dimensional Chiral Superfluids

Yasuhiro Tada, Wenxing Nie, Masaki Oshikawa

摘要:

从谱不对称性和谱流的角度研究了零温下二维$N$费米子手征$(p_x+ip_y)^ν$波超流体中的轨道角动量$L_z$。它表明,$L_z=νN/2$的任何整数$ν$,在BEC制度。相反,在BCS极限中,虽然对于$p+ip$波SF,OAM是$L_z=N/2$,但对于具有$ν\geq2$的手性SF,OAM被显著抑制为$L_z=N\times O(Δ_0/\varepsilon_F)\ll N$,其中$Δ_0$是能隙振幅,$\varepsilon_F$是费米能.我们证明,$p+ip$波SF和BCS制度中的其他手征SF之间的差异源于边缘模式和相关的depairing效应的性质。

英文摘要:

We study the orbital angular momentum (OAM) $L_z$ in two dimensional chiral $(p_x+ip_y)^ν$-wave superfluids (SF) of $N$ fermions on a disc at zero temperature, in terms of spectral asymmetry and spectral flow. It is shown that $L_z=νN/2$ for any integer $ν$, in the BEC regime. In contrast, in the BCS limit, while the OAM is $L_z=N/2$ for the $p+ip$-wave SF, for chiral SF with $ν\geq2$, the OAM is remarkably suppressed as $L_z=N\times O(Δ_0/\varepsilon_F)\ll N$, where $Δ_0$ is the gap amplitude and $\varepsilon_F$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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