Competing higher order topological superconducting phases in triangular lattice magnet-superconductor hybrid systems
Ka Ho Wong, Jacopo Gliozzi, Mark R. Hirsbrunner, Arbaz Malik, Barry Bradlyn, Taylor L. Hughes, Dirk K. Morr
DOI 10.1103/PhysRevB.109.144521 · Physical Review B
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Abstract
We demonstrate that a plethora of higher order topological phases emerge in magnet-superconductor hybrid (MSH) systems through the interplay of a stacked magnetic structure and an underlying triangular surface lattice; the latter being of great current experimental interest. Such lattices offer the ability to create three main types of edge terminations — called x-, y- and y′-edges — of MSH islands that, in turn, give rise to a complex phase diagrams exhibiting various regions of higher order topological superconducting (HOTSC) phases. We identify the single adatom chain, as well as a pair of adjacent adatom chains (called a double-chain), as the basic building blocks for the emergence of HOTSC phases. Of particular interest are those HOTSC phases which arise from a competition between the topology of single- and double-chain blocks, which are absent for square lattices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NiSe2/CrBr3 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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