Anisotropic paramagnetic response of topological Majorana surface states in the superconductor UTe2
Ryoi Ohashi, Jushin Tei, Yukio Tanaka, Takeshi Mizushima, Satoshi Fujimoto
DOI 10.1103/PhysRevB.110.174521 · Physical Review B
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Abstract
Identifying the superconducting gap symmetry and topological signatures in the putative spin-triplet superconductor UTe2 is an important issue. Especially, a smoking-gun detection scheme for Majorana surface states hallmarking topological superconductivity in UTe2 is still lacking. In this study, we examine the surface spin susceptibility of UTe2 with a particular focus on the contribution of the surface states. We find that Majorana surface states contribute significantly to the surface spin susceptibility, and give rise to an Ising-like anisotropy and anomalous enhancement in the surface spin susceptibility. We calculate the surface spin susceptibility as well as the local density of states using the recursive Green's function method and examine the anisotropy of the surface spin susceptibility in terms of the topological surface states and symmetry for all irreducible representations of odd-parity pairing states. Our results indicate that the Ising anisotropy and the anomalous enhancement are attributed to the Majorana surface state protected by the crystalline symmetry. These findings suggest the possibility of detecting the Majorana surface state via magnetic measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.85 | Pressure not reported | unknown |
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