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DY: Fachverband Dynamik und Statistische Physik
DY 27: Statistical Physics far from Thermal Equilibrium - Part I
DY 27.4: Talk
Wednesday, March 18, 2015, 10:30–10:45, BH-N 334
The Second Laws for an Information driven Current through a Spin Valve — •Philipp Strasberg1, Gernot Schaller1, Tobias Brandes1, and Christopher Jarzynski2 — 1Institut für theoretische Physik, TU Berlin, Germany — 2Institute for Physical Science and Technology, University of Maryland, USA
We propose a physically realizable Maxwell's demon device using a spin valve interacting unitarily for a short time with electrons placed on a tape of quantum dots, which is thermodynamically equivalent to the device introduced by Mandal and Jarzynski [PNAS 109, 11641 (2012)]. The model is exactly solvable and we show that it can be equivalently interpreted as a Brownian ratchet demon. We then consider a measurement based discrete feedback scheme, which produces identical system dynamics, but possesses a different second law inequality. We show that the second law for discrete feedback control can provide a smaller, equal or larger bound on the maximum extractable work as compared to the second law involving the tape of bits. Finally, we derive an effective master equation governing the system evolution for Poisson distributed bits on the tape (or measurement times respectively) and we show that its associated entropy production rate contains the same physical statement as the second law involving the tape of bits.
REF: arXiv:1407.7679