Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals
Pei-Hao Fu, Jun Wang, Jun-Feng Liu, Rui-Qiang Wang
DOI 10.1103/PhysRevB.100.115414 · Physical Review B
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Abstract
Weyl node creation and annihilation are unique topological phenomena associated with Weyl fermions. Besides the magnetic field, high-frequency illumination can also break the time-reversal symmetry and induce the creation and annihilation of Weyl nodes from a Dirac semimetal. Experimentally, the Weyl node creation and annihilation induced by a magnetic field have been verified by the signature of negative magnetoresistance. In this work, instead of magnetoresistance signatures by application of a magnetic field, we theoretically study the Josephson signatures of Weyl node creation and annihilation in irradiated Dirac semimetals. It is found that Weyl node creation is accompanied by a two-mode oscillation and 0-π transitions in the Josephson current. We further illustrate that two oscillation modes stem from two Andreev reflection processes: opposite-chirality and equal-chirality Andreev reflections, respectively. With Weyl node annihilation, the Josephson current is first shut down and then recovered by the activation of spin-flipping at interfaces by two ferromagnets. The recovered anomalous Josephson current has an arbitrary and tunable ground-state phase difference, other than 0 and π. These predictions are helpful for experimental observation of illumination-induced Weyl node creation and annihilation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cd3As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Na3Bi 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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