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(Color online) (a) Configuration of the thermal transistor. (b) Heat current vs the control temperature . Parameters are , , , , , , , , , and . Notice that in a wide region both and increase when the temperature is increased.
(Color online) Heat current vs the control temperature . Here , , , , , , , , , and . The shadow region is the range of variation of in the temperature interval .
(Color online) (a) Configuration of the model exhibiting the negative differential thermal resistance (see definition in the text). (b) Heat current vs temperature (at fixed ) for different coupling constants , with lattice size . The system parameters are , , , and . (c) Same as (b) but for different system sizes and . Notice that when the heat current increases with decreasing the external temperature difference.
(Color online) The power spectra of the particles at the right (R) side and the left (L) side of the interface for different temperatures with fixed . The system parameters are , , , , , and . Notice that the overlap of the spectra increases as the temperature increases, which results in the increase of the heat current with decreasing the external temperature difference when .
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