Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of Tokyo (Japan)
Here, we show that Weyl superconductivity can be induced by finite supercurrent in noncentrosymmetric spin–orbit-coupled superconductors with line nodes. We introduce a three-dimensional tight-binding model of a tetragonal superconductor in a D+p-wave pairing state with a finite center-of-mass momentum, and elucidate that a line-nodal to point-nodal spectral transition occurs by applying an infinitesimal supercurrent. We also clarify that the higher-order effect in spin–orbit coupling is particularly important for this phenomenon. The point nodes are protected by topologically nontrivial Weyl charges, and therefore gapless arc states appear on the surface of the superconductor. Furthermore, both the positions and the Weyl charges of the point nodes depend on the direction of the current. In addition, a quantized Berry phase defined on high-symmetry planes characterizes the Weyl nodes when the in-plane supercurrent is considered. Our proposition paves a new way for controlling the superconducting gap structures by using an external field.
Sumita, Shuntaro and Takasan, Kazuaki. "Supercurrent-Induced Weyl Superconductivity." Journal of the Physical Society of Japan, vol. 91, no. 7, Jun. 2022. https://doi.org/10.7566/jpsj.91.074703
Sumita, Shuntaro, & Takasan, Kazuaki (2022). Supercurrent-Induced Weyl Superconductivity. Journal of the Physical Society of Japan, 91(7). https://doi.org/10.7566/jpsj.91.074703
Sumita, Shuntaro, and Takasan, Kazuaki, "Supercurrent-Induced Weyl Superconductivity," Journal of the Physical Society of Japan 91, no. 7 (2022), https://doi.org/10.7566/jpsj.91.074703
@article{osti_1905098,
author = {Sumita, Shuntaro and Takasan, Kazuaki},
title = {Supercurrent-Induced Weyl Superconductivity},
annote = {Here, we show that Weyl superconductivity can be induced by finite supercurrent in noncentrosymmetric spin–orbit-coupled superconductors with line nodes. We introduce a three-dimensional tight-binding model of a tetragonal superconductor in a D+p-wave pairing state with a finite center-of-mass momentum, and elucidate that a line-nodal to point-nodal spectral transition occurs by applying an infinitesimal supercurrent. We also clarify that the higher-order effect in spin–orbit coupling is particularly important for this phenomenon. The point nodes are protected by topologically nontrivial Weyl charges, and therefore gapless arc states appear on the surface of the superconductor. Furthermore, both the positions and the Weyl charges of the point nodes depend on the direction of the current. In addition, a quantized Berry phase defined on high-symmetry planes characterizes the Weyl nodes when the in-plane supercurrent is considered. Our proposition paves a new way for controlling the superconducting gap structures by using an external field.},
doi = {10.7566/jpsj.91.074703},
url = {https://www.osti.gov/biblio/1905098},
journal = {Journal of the Physical Society of Japan},
issn = {ISSN 0031-9015},
number = {7},
volume = {91},
place = {United States},
publisher = {Physical Society of Japan},
year = {2022},
month = {06}}