THEORY OF THE THERMOPOWER OF A QUANTUM DOT

Article

关键词: COULOMB-BLOCKADE;    TRANSPORT;    OSCILLATIONS;    FLUCTUATIONS;    REGIME;    CONDUCTANCE;    CHANNEL;    CHARGE;   

DOI  :  10.1103/PhysRevB.46.9667

来源: SCIE

【 摘 要 】

A linear-response theory is presented for the thermopower of a quantum dot of small capacitance. In the classical regime (thermal energy kT much greater than the level spacing DELTAE), the thermopower oscillates around zero in a sawtooth fashion as a function of Fermi energy (as long as kT is small compared to the charging energy e2/C) . The periodicity of the oscillations is the same as that of the previously studied Coulomb-blockade oscillations in the conductance, and is determined by the difference in ground-state energies on addition of a single electron to the quantum dot. In the quantum regime of resonant tunneling (kT much less than DELTAE), a fine structure is predicted to develop on the oscillations. Unlike the Coulomb-blockade oscillations, the periodicity of the fine structure is determined by the excitation spectrum at a constant number of electrons on the quantum dot.

【 授权许可】

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