Theory of $d + id$ Second-Order Topological Superconductors
- URL: http://arxiv.org/abs/2310.17992v1
- Date: Fri, 27 Oct 2023 09:06:12 GMT
- Title: Theory of $d + id$ Second-Order Topological Superconductors
- Authors: Zi-Ming Wang, Meng Zeng, Chen Lu, Da-Shuai Ma, Rui-Xing Zhang, Lun-Hui
Hu, Dong-Hui Xu
- Abstract summary: We study the realization of second-order topology that defines anomalous gapless boundary modes in a two-orbital superconductor.
We reveal a time-reversal symmetry-breaking second-order topological superconducting phase with $d+id$-wave orbital-dependent paring.
Our work not only reveals a unique mechanism of time-reversal symmetry breaking second-order topological superconductors but also bridges the gap between second-order topology and orbital-dependent pairings.
- Score: 9.85377596401486
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Topological superconductors are a class of unconventional superconducting
materials featuring sub-gap zero-energy Majorana bound modes that hold promise
as a building block for topological quantum computing. In this work, we study
the realization of second-order topology that defines anomalous gapless
boundary modes in a two-orbital superconductor with spin-orbital couplings. We
reveal a time-reversal symmetry-breaking second-order topological
superconducting phase with $d+id$-wave orbital-dependent paring without the
need for the external magnetic field. Remarkably, this orbital-active $d$-wave
paring gives rise to anomalous zero-energy Majorana corner modes, which is in
contrast to conventional chiral $d$-wave pairing, accommodating one-dimensional
Majorana edge modes. Our work not only reveals a unique mechanism of
time-reversal symmetry breaking second-order topological superconductors but
also bridges the gap between second-order topology and orbital-dependent
pairings.
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