Thermoelectric effects in menososcopic physics

Date

2004

Author

Çipiloğlu, M. Ali

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The electrical and thermal conductance and the Seebeck coefficient are calculated for one-dimensional systems, and their behavior as a function of temperature and chemical potential is investigated. It is shown that the conductances are proportional to an average of the transmission probability around the Fermi level with the average taken for the thermal conductance being over a wider range. This has the effect of creating less well-defined plateaus for thermal-conductance quantization experiments. For weak non-linearities, the charge and entropy currents across a quantum point contact are expanded as a series in powers of the applied bias voltage and the temperature difference. After that, the expansions of the Seebeck voltage in temperature difference and the Peltier heat in current are obtained. Also, it is shown that the linear thermal conductance of a quantum point contact displays a half-plateau structure, almost flat regions appearing around half-integer multiples of the conductance quantum. This structure is investigated for the saddle-potential model.

Subject Keywords

Mesoscopic phenomena (Physics)

URI

https://hdl.handle.net/11511/14038

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. A. Çipiloğlu, “Thermoelectric effects in menososcopic physics,” Ph.D. - Doctoral Program, Middle East Technical University, 2004.