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Surface instability in nodal noncentrosymmetric superconductors

机译:节点非中心对称超导体的表面不稳定性

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摘要

We study the stability of topologically protected zero-energy flat bands at the surface of nodal noncentrosymmetric superconductors, accounting for the alteration of the gap near the surface. Within a self-consistent mean-field theory, we show that the flat bands survive in a broad temperature range below the bulk transition temperature. There is a second transition at a lower temperature, however, below which the system spontaneously breaks time-reversal symmetry. The surface bands are shifted away from zero energy and become weakly dispersive. Simultaneously, a spin polarization and an equilibrium charge current develop in the surface region.
机译:我们研究了节点非中心对称超导体表面受拓扑保护的零能量平带的稳定性,这说明了表面附近间隙的变化。在自洽平均场理论中,我们表明,平坦带在低于体相转变温度的较宽温度范围内生存。但是,在较低的温度下会发生第二次跃迁,在此之下,系统会自发地破坏时间反转对称性。表面带移离零能量并变得弱分散。同时,在表面区域中产生了自旋极化和平衡电荷电流。

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