论文标题
在强伪磁场中的Weyl半法的超导性
Superconductivity in Weyl semimetals in a strong pseudomagnetic field
论文作者
论文摘要
在强应力诱导的伪磁场中，Weyl半法中的S-WAVE状态在具有局部四晶体相互作用的模型中研究了。发现仅在最低的伪landau水平近似中只能进行节点配对。与传统磁场中最低的兰道水平的情况不同，相应的间隙方程仅具有微不足道的解决方案。然而，可以通过通常的S波旋转超导体的接近效应来诱导超导性。由于伪磁场必然存在于Weyl半学表面，因此近端效应受伪磁场的强烈影响。对这种效果的分析表明，尽管在频谱中没有差距，但能量水平的退化却取消了。可以通过状态的密度，光谱函数和隧穿电流探测Weyl半学中接近效应的独特特征。状态的密度不会在小能量下消失，并与伪磁场强度线性缩放。此缩放也表现在隧道电流中。
The superconducting s-wave state in Weyl semimetals in a strong strain-induced pseudomagnetic field is investigated in a model with local four-fermion interaction. It is found that only the inter-node pairing is possible in the lowest pseudo-Landau level approximation. Unlike the case of the lowest Landau level in a conventional magnetic field, the corresponding gap equation has only a trivial solution. Nevertheless, superconductivity can be induced via the proximity effect with a usual s-wave spin-singlet superconductor. Since a pseudomagnetic field is present necessarily at the surface of a Weyl semimetal, the proximity effect is strongly affected by the pseudomagnetic field. The analysis of such an effect showed that while no gap is opened in the spectrum, the degeneracy of energy levels is lifted. The unique character of the proximity effect in Weyl semimetals can be probed via the density of states, the spectral function, and the tunneling current. The density of states does not vanish at small energies and scales linearly with the pseudomagnetic field strength. This scaling is manifested also in the tunneling current.
