Gap anisotropy in layered superconductors due to Rashba and Dresselhaus spin-orbit interactions
Bahruz Suleymanli, B. Tanatar
DOI 10.1103/bfhr-5bnc · Physical Review B
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Abstract
The theory of layered superconductors is extended in the presence of Rashba and Dresselhaus spin-orbit interactions (SOIs). Using the intralayer BCS-like pairing interaction and employing the Gor'kov formalism, we obtain analytical expressions for the temperature Green's functions and determine the gap function Δ which becomes complex in the presence of SOIs. In the absence of SOIs, Δ is isotropic at both zero and finite temperatures, but it becomes anisotropic even in the presence of a single SOI. This anisotropy is related to the extra coskz factors in which the kz momentum along the z direction contributes to the magnitude of the gap function. It is also found that SOIs suppress Δ at both zero and finite temperatures, and for certain critical values of SOIs and beyond Δ vanishes. Analytical expressions for the critical values of SOIs at zero temperature are obtained. Additionally, how the BCS equation for layered superconductors changes in the presence of SOIs is determined.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl-Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.25 | Pressure not reported | unknown |
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