The Effciency of a Simple Quantum Heat Engine
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Date
2011-11
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Addis Ababa University
Abstract
We study a quantum heat engine with a working substance as a two level single spin-1/2
system immersed in a magnetic eld region. Work is produced when the spin-1/2 system
is being carried from high magnetic eld region to a low magnetic eld region. Heat is
transfered when the occupation probabilities of the spin-1/2 system is changed while the
energy level remains the same due to constant magnetic eld. We have found that the
e ciency of the engine at quasi-static limit is equal to the Carnot e ciency. We have also
found that the e ciency at maximum power of our model heat engine is equal to that of
the Curzon-Ahlborn e ciency
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Keywords
Quantum Heat Engine