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The Kitaev model exhibits a canonical quantum spin liquid as a ground stateand hosts two fractional quasiparticles, itinerant Majorana fermion andlocalized flux excitation. The former can carry heat and spin modulations inthe quantum spin liquid, but the role of the latter remains unknown for thetransport phenomena. Here, we focus on spin transport in the presence ofexcited fluxes and report that they yield strong interference in thepropagation of the Majorana fermions, which feel gauge-like potential emergentaround the fluxes. We examine the transient spin dynamics triggered by a pulsedmagnetic field at an edge. In the absence of excited fluxes, the magnetic-fieldpulse creates the plane wave of the Majorana fermions, which flows in thequantum spin liquid. Although this wave does not accompany the change of localspin moments in bulk, it induces local moments at the side opposite to the edgeunder the magnetic-field pulse. We observe the spatial modulation of inducedspin moments when fluxes are excited in the bulk region. This behavior is morestriking than the case of lattice defects. Moreover, we find that, although theamplitude of the spatial change is almost independent of the distance betweenlattice defects, it is strongly enhanced by increasing the distance for thecase of excited fluxes. The difference is understood from the influence on theitinerant Majorana fermions; the lattice defects change the system locally, butflux excitations alter all the transfer integrals on the string connectingthem. The present results will provide another route to observing intrinsicflux excitations distinguished from extrinsic effects such as lattice defects.

Scattering phenomena for spin transport in Kitaev spin liquid