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We theoretically demonstrate that dc electron flow across the junction oftwo-dimensional electron systems leads to excitation of edge magnetoplasmons.The threshold current for such plasmon excitation does not depend on contacteffects and approaches zero for ballistic electron systems, which makes astrong distinction from the well-known Dyakonov-Shur and Cerenkov-typeinstabilities. We estimate the competing plasmon energy gain from dc currentand loss due to electron scattering. We show that plasmon self excitation isfeasible in GaAs-based heterostructures at $T\lesssim 200$ K and magneticfields $B \lesssim 10$ T.

Thresholdless excitation of edge plasmons by transverse current