Models of superconducting Cu:Bi2Se3: Single- versus two-band description
S.-K. Yip
DOI 10.1103/PhysRevB.87.104505 · Physical Review B
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Abstract
Starting from a model Hamiltonian for the normal state of the topological insulator Bi2Se3, we construct a pseudospin basis for the single-particle wave functions. Considering weak superconducting pairing near the Fermi surface, we express the recently proposed superconducting order parameters for Cu-doped Bi2Se3 in this basis. For the odd-parity states, the d⃗(k⃗) vectors specifying the order parameter can have unusual momentum k⃗ dependence for certain parameter regimes. Some peculiar results in the literature for surface states are discussed in light of the forms of these d⃗(k⃗)'s. Properties of the even-parity states are also illuminated using this pseudospin basis. Results from this single-band description are compared with those from the full two-band model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Cu:Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
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