Single-electron thermal devices coupled to a mesoscopic gate

Rafael Sánchez, Holger Thierschmann, Laurens W. Molenkamp

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    We theoretically investigate the propagation of heat currents in a three-terminal quantum dot engine. Electron-electron interactions introduce state-dependent processes which can be resolved by energy-dependent tunneling rates. We identify the relevant transitions which define the operation of the system as a thermal transistor or a thermal diode. In the former case, thermal-induced charge fluctuations in the gate dot modify the thermal currents in the conductor with suppressed heat injection, resulting in huge amplification factors and the possible gating with arbitrarily low energy cost. In the latter case, enhanced correlations of the state-selective tunneling transitions redistribute heat flows giving high rectification coefficients and the unexpected cooling of one conductor terminal by heating the other one. We propose quantum dot arrays as a possible way to achieve the extreme tunneling asymmetries required for the different operations.

    Original languageEnglish
    Article number113040
    Number of pages13
    JournalNew Journal of Physics
    Issue number11
    Publication statusPublished - 1 Nov 2017


    • heat currents
    • quantum dot
    • single-electron tunneling
    • thermal devices

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