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• W2022184814 abstract "We calculate the thermopower of a quantum dot described by two doublets hybridized with two degenerate bands of two conducting leads, conserving orbital (band) and spin quantum numbers, as a function of the temperature $T$ and a splitting $delta$ of the quantum dot levels which breaks the SU(4) symmetry. The splitting can be regarded as a Zeeman (spin) or valley (orbital) splitting. We use the non-crossing approximation (NCA), the slave bosons in the mean-field approximation (SBMFA) and also the numerical renormalization group (NRG) for large $delta$. The model describes transport through clean C nanotubes %with weak disorder and in Si fin-type field effect transistors, under an applied magnetic field. The thermopower as a function of temperature $S(T)$ displays two dips that correspond to the energy scales given by the Kondo temperature $T_K$ and $delta$ and one peak when $k_BT$ reaches the charge-transfer energy. These features are much more pronounced than the corresponding ones in the conductance, indicating that the thermopower is a more sensitive probe of the electronic structure at intermediate or high energies. At low temperatures ($T ll T_K$) $T_K S(T)/T$ is a constant that increases strongly near the degeneracy point $delta=0$. We find that the SBMFA fails to provide an accurate description of the thermopower for large $delta$. Instead, a combination of Fermi liquid relations with the quantum-dot occupations calculated within the NCA gives reliable results for $T ll T_K$." @default.
• W2022184814 created "2016-06-24" @default.
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• W2022184814 date "2012-10-04" @default.
• W2022184814 modified "2023-10-10" @default.
• W2022184814 title "Thermopower of an SU(4) Kondo resonance under an SU(2) symmetry-breaking field" @default.
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• W2022184814 doi "https://doi.org/10.1103/physrevb.86.165106" @default.
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