Speaker
Natalia Golubeva
(Aarhus University)
Description
We investigate the efficiency at maximum power (EMP) of
systems of autonomous molecular machines operating under
constant load and interacting through hard-core exclusion.
For biological machines we show in the case of kinesin
motors moving on a single filament that mutual interactions
enhance the EMP, as compared to the non-interacting case,
due to a change in the characteristic response of the system
to external load [1-2]. Remarkably, the EMP enhancement
occurs in a limited region of the system parameter space,
compatible with the biologically relevant range. By
considering exclusion processes on networks for generic
tightly and loosely coupled motors we show that interaction
induced EMP enhancement can also be observed for more
general cooperative systems [3]. Furthermore, we identify
parameter regimes for which the loss in the maximum output
power due to exclusion is compensated by the corresponding
EMP boost, thereby providing design strategies for efficient
artificial nanomotors operating at maximum power.
[1] N. Golubeva and A. Imparato, Phys.Rev.Lett 109, 190692
(2012)
[2] N. Golubeva and A. Imparato, Phys.Rev.E 88, 012114 (2013)
[3] N. Golubeva and A. Imparato, arXiv:1402.0713
