Driven  systems are  associated with a net flow of some physical quantity,  namely  “current”, which  is the main observable that distinguishes non-equilibrium steady states from their  equilibrium  counterparts.  Current in non-equilibrium systems exhibit many interesting features. We discuss two, (a)  negative response: current decreases with increasing bias (b)  current reversal or uphill current : for a fixed bias, the direction of current can be reversed by changing the particle density.  We demonstrate these phenomena in several driven interacting particle systems where the steady state probabilities can be obtained  exactly.  

Conclusion:  Interacting particle systems have multiple current carrying modes;  slowing down some  non-driven modes   can  generate  negative  differential mobility.

Ref : 

2. Negative Differential Mobility in Interacting Particle Systems, AK Chatterjee, U Basu and PKM, arXiv:1712.01236