Abstract
Thermoelectric effect is studied in an Aharonov-Bohm interferometer with an embedded quantum dot (QD) in the Coulomb blockade regime. The electrical conductance, electron thermal conductance, thermopower, and thermoelectric figure-of-merit are calculated by using the Keldysh Green's function method. It is found that the figure-of-merit ZT of the QD ring may be quite high due to the Fano effect originated from the quantum interference effect. Moreover, the thermoelectric efficiency is sensitive to the magnitude of the dot-lead and inter-lead coupling strengthes. The effect of intradot Coulomb repulsion on ZT is significant in the weak-coupling regime, and then large ZT values can be obtained at rather high temperature.
Highlights
Thermoelectric phenomenon, which involves the conversion between thermal and electrical energies, has attracted much theoretical and experimental interests in recent years [1,2]
The thermoelectric efficiency is usually characterized by the dimensionless figure-of-merit ZT = S2GT=(el + ph), where T is the temperature of the system, the thermopower (Seebeck coefficient) S measures how large a voltage can be induced in response to a given temperature gradient, the electrical conductance G measures how charges can flow through the system to generate voltage drop, the electron thermal conductance el and phonon thermal conductance ph measure how hard heat can transfer across the system to maintain a temperature gradient [2]
We study the thermoelectric effect in a single quantum dot (QD) ring with both Coulomb interaction and magnetic flux at room temperature
Summary
Thermoelectric phenomenon, which involves the conversion between thermal and electrical energies, has attracted much theoretical and experimental interests in recent years [1,2]. We study the thermoelectric effect in a single QD ring with both Coulomb interaction and magnetic flux at room temperature. The electrical conductance, thermal conductance, thermopower, and thermoelectric figure-of-merit as functions of the QD energy level are investigated in the linear-response regime, where the temperature and the bias voltage differences between the two leads all tend to zero.
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