Quantum hydrodynamic modeling of edge modes in chiral Berry plasmons
AbstractA quantum hydrodynamic model is used to study the edge modes of chiral Berry plasmons in two-dimensional materials with nonzero Berry flux. A quantum effect of collective electron motions appears in systems with a high electron density. For the considered edge plasmon, the transcendental equation of the dispersion relation is solved nonlinearly and semianalytically. We predict a one-way chiral edge state in the presence of the quantum statistical effect and quantum diffraction effect. Indeed, the plasmon frequencies for counterpropagating edge modes exhibit different long-wavelength limits. The quantum effect can enhance the chirality of edge plasmons and their spatial confinement.