%0 Journal Article %1 PhysRevB.103.184510 %A Rui, W. B. %A Zhang, Song-Bo %A Hirschmann, Moritz M. %A Zheng, Zhen %A Schnyder, Andreas P. %A Trauzettel, Björn %A Wang, Z. D. %D 2021 %I American Physical Society %J Phys. Rev. B %K a %N 18 %P 184510 %R 10.1103/PhysRevB.103.184510 %T Higher-order Weyl superconductors with anisotropic Weyl-point connectivity %U https://link.aps.org/doi/10.1103/PhysRevB.103.184510 %V 103 %X Weyl superconductors feature Weyl points at zero energy in the three-dimensional Brillouin zone and arc states that connect the projections of these Weyl points on the surface. We report that higher-order Weyl superconductors can be realized in odd-parity topological superconductors with time-reversal symmetry being broken by periodic driving. Different from conventional Weyl points, the higher-order Weyl points in the bulk separate 2D first- and second-order topological phases, while on the surface, their projections are connected not only by conventional surface Majorana arcs but also by hinge Majorana arcs. Strikingly, without the protection by a Chern number, the hinge Majorana arcs are anisotropic with respect to surface orientations, forcing a different connectivity of Weyl points for a rotated surface. We identify such anisotropic Weyl-point connectivity as a characteristic feature of higher-order Weyl materials. Moreover, with time-reversal symmetry being broken, the higher-order hinge Majorana arcs are spin polarized, which offers a promising opportunity to observe the anisotropic Weyl-point connectivity with spin-sensitive probes. Besides condensed-matter systems, we provide a feasible experimental setup for realizing our predictions in cold-atom systems.

@article{PhysRevB.103.184510, abstract = {Weyl superconductors feature Weyl points at zero energy in the three-dimensional Brillouin zone and arc states that connect the projections of these Weyl points on the surface. We report that higher-order Weyl superconductors can be realized in odd-parity topological superconductors with time-reversal symmetry being broken by periodic driving. Different from conventional Weyl points, the higher-order Weyl points in the bulk separate 2D first- and second-order topological phases, while on the surface, their projections are connected not only by conventional surface Majorana arcs but also by hinge Majorana arcs. Strikingly, without the protection by a Chern number, the hinge Majorana arcs are anisotropic with respect to surface orientations, forcing a different connectivity of Weyl points for a rotated surface. We identify such anisotropic Weyl-point connectivity as a characteristic feature of higher-order Weyl materials. Moreover, with time-reversal symmetry being broken, the higher-order hinge Majorana arcs are spin polarized, which offers a promising opportunity to observe the anisotropic Weyl-point connectivity with spin-sensitive probes. Besides condensed-matter systems, we provide a feasible experimental setup for realizing our predictions in cold-atom systems.}, added-at = {2021-10-11T11:37:58.000+0200}, author = {Rui, W. B. and Zhang, Song-Bo and Hirschmann, Moritz M. and Zheng, Zhen and Schnyder, Andreas P. and Trauzettel, Bj\"orn and Wang, Z. D.}, biburl = {https://www.bibsonomy.org/bibtex/2dc8563a357c0241c01e76167458e8156/ctqmat}, day = 19, description = {Phys. Rev. B 103, 184510 (2021) - Higher-order Weyl superconductors with anisotropic Weyl-point connectivity}, doi = {10.1103/PhysRevB.103.184510}, interhash = {dfeacf45a11decf2fedca344b419537d}, intrahash = {dc8563a357c0241c01e76167458e8156}, journal = {Phys. Rev. B}, keywords = {a}, month = may, number = 18, numpages = {14}, pages = 184510, publisher = {American Physical Society}, timestamp = {2023-01-16T14:49:29.000+0100}, title = {Higher-order Weyl superconductors with anisotropic Weyl-point connectivity}, url = {https://link.aps.org/doi/10.1103/PhysRevB.103.184510}, volume = 103, year = 2021 }