Higher-order topological superconductivity: Possible realization in Fermi gases and Sr2RuO4
Zhigang Wu, Zhongbo Yan, Wen Huang
DOI 10.1103/PhysRevB.99.020508 · Physical Review B
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Abstract
We propose to realize second-order topological superconductivity in bilayer spin-polarized Fermi gas superfluids. We focus on systems with intralayer chiral p-wave pairing and with tunable interlayer hopping and interlayer interactions. Under appropriate circumstances, an interlayer even-parity s- or d-wave pairing may coexist with the intralayer p wave. Our model supports localized Majorana zero modes not only at the corners of the system geometry, but also at the termination of certain one-dimensional defects, such as superfluid domain walls and lattice line defects. We show how such topological phases and the Majorana zero modes therein can be manipulated in a multitude of ways by tuning the interlayer pairing and hopping. Generalized to spinful systems, we further propose that the putative p-wave superconductor Sr2RuO4, when subject to uniaxial strains, may also realize the desired topological phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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