Figure 3
(a) The panels refer to
(left),
(center), and
(right). When
approaches the black curve, i.e., at values very close to the analytical value of Eq. (
5) (dashed line), a change of sign in the heat flow occurs. For
above the threshold (blue region), the machine works as pictured in (b), extracting heat from the
and
reservoirs and pumping it into
. In the opposite regime (under the threshold, red region), heat cannot be extracted from
. The dashed black line above the gray region indicates
. The background color intensity is proportional to the actual heat pumped to (extracted from)
. (c) Comparison between heat extraction and single-particle occupation for
. In regions I and II, the SCR is working (heat is extracted from
), while in regions III and IV, the
bath receives heat. In regions I and III, we have an effective decrease of the occupation number of
(i.e.,
). (d) Efficiency of the SCR compared to the Carnot efficiency (dashed black line) for
. The curves represent, respectively from top to bottom,
(blue),
(magenta), and
(brown). The dashed horizontal line indicates the maximum limit of efficiency for the quadridot computed (for
) as in Ref.
4.
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