We investigate the effect of mixing Rashba/Dresselhaus spin-orbit couplings (SOCs) on the topological properties of D + p-wave superconductors. It is known that the nodal D + p-wave Rashba superconductors become gapful under a Zeeman magnetic field. We extend this gap-generation mechanism to mixed Rashba/Dresselhaus systems and find that the induced energy gaps are strongly modified by the Dresselhaus component in the second quadrant of the Brillion zone (BZ). We further calculate the Chern number numerically and obtain the topological phase diagram. It is shown that the Dresselhaus SOCs have a negative effect on the topological properties; the topological nontrivial region withC= -4 in the phase diagram shrinks as the amplitude of the Dresselhaus component increases. In the Dresselhaus-dominated regime, the contributions of gapped nodes from different quadrants of the BZ cancel each other, resulting in zero Chern number in most of the phase diagram. The numerical results are well explained by an approximate analytical formula for Chern number.

中文翻译：

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混合 Rashba/Dresselhaus 系统中 D+p 波超导体的拓扑特性。


我们研究了混合 Rashba/Dresselhaus 自旋轨道耦合 (SOC) 对 D + p 波超导体拓扑特性的影响。众所周知，节点 D + p 波 Rashba 超导体在塞曼磁场下会变得有隙。我们将这种能隙生成机制扩展到混合的 Rashba/Dresselhaus 系统，并发现感应能隙受到十亿区 (BZ) 第二象限中的 Dresselhaus 组件的强烈修改。我们进一步数值计算陈数并得到拓扑相图。结果表明，Dresselhaus SOC 对拓扑特性有负面影响；随着 Dresselhaus 分量幅度的增加，相图中 C= -4 的拓扑非平凡区域缩小。在 Dresselhaus 主导的体系中，来自 BZ 不同象限的带隙节点的贡献相互抵消，导致相图中大部分相图的陈数为零。陈数的近似解析公式可以很好地解释数值结果。