Optomagnonic Josephson effect in antiferromagnets

Combining advanced technologies of optics and antiferromagnetic spintronics, we present a method to realize ultrafast spin transport. The optical Barnett effect provokes quasiequilibrium Bose-Einstein condensates (BECs) magnons associated with the fully spin-polarized state in insulating antiferromagnets (AFs). This optomagnonic enables us exploit coherent high frequency over conventional ones (sub-) terahertz N\'eel magnetic order. We show that macroscopic coherence those magnon BECs induces current across junction interface weakly coupled two AFs, this Josephson realizes period oscillation is much shorter than one order picoseconds. Thus propose way transport AFs by means BECs.