Refined Majorana phase diagram in a topological insulator–superconductor hybrid system
Xin Yue (岳鑫), Guo-Jian Qiao (乔国健), C. P. Sun (孙昌璞)
DOI 10.1103/PhysRevB.108.195405 · Physical Review B
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Abstract
The edge state of the topological insulator coupled to a superconductor system is able to simulate the Majorana fermion in zero-energy mode since the Kitaev-type pairing is induced by exchanging quasi-excitations in electron tunneling. However, this is not always the case. The present study has revealed that this physical simulation is not valid for a larger surface gap, which is the energy gap of the insulator's surface states. A refined pairing term that depends on the surface gap has been obtained as a second-order effect of the proximity effect, whereas the lowest order produces a constant pairing strength. By carefully considering the dependence of pairing strength on the surface gap, the Majorana phase diagram is re-achieved and a significant difference from previous work is observed, where the pairing strength was assumed to be independent of the surface gap and resulted in a conical phase boundary.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbSe2 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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