Dissipative drift instability of plasmons in a single-layer graphene

We predict the plasmon instability associated with losses in hydrodynamic graphene with a drift -current bias. The instability appears even in a single -layer graphene and becomes stronger for greater losses in graphene in hydrodynamic regime but disappears in the lossless case. The unstable plasmon mode vanishes for zero drift velocity instead of transforming into any plasmon mode existing in graphene without carrier drift. The dissipative instability occurs for any finite drift velocity but the instability increment decreases down to zero for vanishing carrier drift velocity. The strongest instability develops for codirected carrier drift and plasmon propagation directions.