IISER Pune
INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH (IISER) PUNE
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An Autonomous Institution, Ministry of Human Resource Development, Govt. of India
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Seminars and Colloquia

Physics

Can current decrease with increasing bias: onset of negative response in non-equilibrium systems 
 
Thu, May 31, 2018,   04:00 PM at Physics Seminar Room 31, 2nd floor, main buidling

Prof. P K Mohanty
Saha Institute of Nuclear Physics, Kolkata

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.
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