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- W4281939807 abstract "We study theoretically the Josephson junction S/FI/S (S: d-wave superconductor, FI: ferromagnetic insulator) on the surface of a topological insulator. We find it can show a very large nonreciprocity, i.e., diode effect, by tuning the crystal axis of $d$-wave superconductor and the magnetization in FI. The difference of the upper critical currents $I_c$'s between the positive ($I_{c}^{+}$) and negative ($I_{c}^{-}$) directions can be about factor 2, where the current-phase relation can be modified largely from the conventional one, due to the simultaneous presence of $sin(varphi)$, $sin(2varphi)$ and $cos(varphi)$ components with $varphi$ being the macroscopic phase difference between two superconductors. The predicted quality factor $Q$ characterizing the diode effect has a strong temperature dependence and its sign is reversed by the change of the direction of the magnetization in FI. The enhancement of $Q$ at low temperature stems from the Majorana bound states at the interface. This result can pave a way to realize an efficient superconducting diode with low energy cost." @default.
- W4281939807 created "2022-06-13" @default.
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- W4281939807 date "2022-05-26" @default.
- W4281939807 modified "2023-09-27" @default.
- W4281939807 title "Theory of diode effect in d-wave superconductor junctions on the surface of topological insulator" @default.
- W4281939807 hasPublicationYear "2022" @default.
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