Abstract
Electrical current induced heat generation through an ultrasmall quantum dot–leads coupled system under AC fields is investigated by employing the nonequilibrium Green’s function technique. The external AC fields, charging energy and junction capacitances influence the heat generation sensitively. We find negative differential heat generation in our system. The reason for this is the Coulomb interaction, and the negative differential heat generation becomes larger as the frequency of AC fields \(\omega \) increases. In addition, the peak caused by charging energy in \(Q{/}\omega _0\) curve increases with \(\omega \) rapidly. A region in which the value \(Q{/}I\) is low emerges due to the charging effect. It is an ideal region for device operation. This region will enlarge as the parameter \(R\) and the charging energy \(E_c\) increase.
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