Matsushita Taiki, Ando Jiei, Masaki Yusuke, Mizushima Takeshi, Fujimoto Satoshi, Vekhter Ilya
Department of Materials Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8578, Japan.
Phys Rev Lett. 2022 Mar 4;128(9):097001. doi: 10.1103/PhysRevLett.128.097001.
We investigate the spin-Nernst effect in time-reversal-invariant topological superconductors, and show that it provides smoking-gun evidence for helical Cooper pairs. The spin-Nernst effect stems from asymmetric, in spin space, scattering of quasiparticles at nonmagnetic impurities, and generates a transverse spin current by the temperature gradient. Both the sign and the magnitude of the effect sensitively depend on the scattering phase shift at impurity sites. Therefore the spin-Nernst effect is uniquely suitable for identifying time-reversal-invariant topological superconducting orders.
我们研究了时间反演不变拓扑超导体中的自旋能斯特效应，并表明它为螺旋库珀对提供了确凿证据。自旋能斯特效应源于准粒子在非磁性杂质处的自旋空间不对称散射，并由温度梯度产生横向自旋电流。该效应的符号和大小都敏感地取决于杂质位点处的散射相移。因此，自旋能斯特效应特别适合于识别时间反演不变拓扑超导序。
