Chiral Majorana hinge modes in superconducting Dirac materials

Bo Fu; Zi-Ang Hu; Chang-An Li; Jian Li; Shun-Qing Shen

doi:10.1103/PhysRevB.103.L180504

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Chiral Majorana hinge modes in superconducting Dirac materials

Bo Fu, Zi-Ang Hu, Chang-An Li, Jian Li, Shun-Qing Shen

DOI 10.1103/PhysRevB.103.L180504 · Physical Review B

T1

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Abstract

Chiral Majorana hinge modes are characteristic of a second-order topological superconductor in three dimensions. Here we systematically study pairing symmetry and the leading pairing channels in Dirac materials with the point group D2h, and find that the s+id-wave pairing superconductivity may exist as a consequence of competition between s- and d-wave pairing. The superconducting state is topologically nontrivial and possesses Majorana hinge and surface modes. The chiral Majorana hinge modes can be characterized by a winding number of the quadrupole moment or quantized quadruple moment at the symmetrically invariant point. Possible relevance to superconductivity in ZrTe5 is discussed. Our findings suggest the strong spin-orbital coupling, crystalline symmetries, and electron-electron interaction in the Dirac materials may provide a platform to realize chiral Majorana hinge modes with no proximity effect or external fields.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
ZrTe5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown