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As it is well known most of charge density wave (CDW) and spin density wave(SDW) exhibit the nonlinear transport with well defined threshold electricfield E_T. Here we study theoretically the threshold electric field ofunconventional density waves. We find that the threshold field increasesmonotonically with temperature without divergent behaviour at T_c, unlike theone in conventional CDW. The present result in the 3D weak pinning limitappears to describe rather well the threshold electric field observed recentlyin the low-temperature phase (LTP) of alpha-(BEDT-TTF)_2KHg(SCN)_4.Comment: 4 pages, 2 figure

Threshold electric field in unconventional density waves