Kubo formula for finite size systems

Details Kubo formula for finite size systems Kubo formula for finite size systems

2010-03-09

arxiv.org/abs/1003.1992v1

Europhysics Letters, 92, 30003 (2010)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

10.1209/0295-5075/92/30003

We demonstrate that the proper calculation of the linear response for finite-size systems can only be performed if the coupling to the leads/baths is explicitly taken into consideration. We exemplify this by obtaining a Kubo-type formula for heat transport in a finite-size system coupled to two thermal baths, kept at different temperatures. We show that the proper calculation results in a well-behaved response, without the singular contributions from degenerate states encountered when Kubo formulae for infinite-size systems are inappropriately used for finite-size systems.

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