Josephson effect of pseudospin-1 fermions in a dice lattice based superconducting junction
Zixuan Ding, Yuheng Xing, Mengyao Li, Hao Fu
DOI 10.1103/k3ph-hpnb · Physical Review B
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Abstract
We investigate the Josephson effect of pseudospin-1 fermions in a superconductor/normal/superconductor (S/N/S) junction based on the dice lattice, where the supercurrent is mediated by topological edge states. Two types of staggered magnetizations are applied in the middle N region, respectively. It is shown that, for the A-B-C lattice staggered magnetization, the 0−π state transition can be realized by modulating the magnetization strength M. However, a larger M may inhibit the occurrence of the 0−π state transition and even the supercurrent. For the A-C lattice staggered magnetization, the oppositely flowing critical supercurrents are asymmetric, indicating a Josephson diode effect (JDE), which is due to spin-resolved edge states possessing different Fermi velocities in opposite directions. In particular, the JDE efficiency can increase from zero to approximately 24% by modulating M, giving rise to a high nonreciprocity. Our results not only uncover the unique supercurrent features of pseudospin-1 fermions in the topological dice lattice but also provide an alternative approach for generating the 0−π state transition and an efficient JDE.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb3Br8 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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