自旋轨道耦合驱动下二维质量不相等费米气体的拓扑相

发布时间：2018-01-05 08:02

  本文关键词：自旋轨道耦合驱动下二维质量不相等费米气体的拓扑相　出处：《山西大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

  更多相关文章： 费米气体 自旋轨道耦合(SOC) 质量不相等 拓扑相

【摘要】：用平均场理论研究了二维质量不相等费米气系统的零温特性,该系统具有equal-Rashba-Dresselhaus(ERD)型自旋轨道耦合作用和Zeeman场。在该系统中存在三种不同的超流相(US-0相、US-1相、US-2相),我们通过数值分析能隙方程和粒子数方程组成的自洽方程组,发现二维费米气系统的质量相差越大,Zeeman场对超流序参量Δ的抑制作用就会越强。在弱吸引相互作用区域,随着自旋轨道耦合强度的增加,US-2拓扑超流相会逐渐收缩。自旋轨道耦合强度一定情况下,质量比0λ≤1时,只有在弱吸引相互作用区域存在US-2拓扑超流相;当质量比λ1时,在弱相互作用区域和强相互作用区域都存在US-2拓扑超流相。
[Abstract]:In this paper, the zero-temperature characteristic of two-dimensional Fermi gas system with unequal mass is studied by means of the mean field theory. The system has equal-Rashba-Dresselhauser ERD type spin-orbit coupling and Zeeman field. There are three different superflow phases in the system. US-0 phase. By numerical analysis of the self-consistent equations composed of the energy gap equation and the particle number equation, it is found that the mass difference of the two-dimensional Fermi gas system is greater than that of the two dimensional Fermi gas system. The stronger the suppression of the superfluid order parameter 螖 by the Zeeman field is, the more the coupling strength of the spin orbit increases in the region of weak attraction interaction. The supercurrent phase of US-2 topology will shrink gradually. When the spin-orbit coupling strength is constant, the mass ratio of 0 位 鈮，

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