Thermoelectric effects in menososcopic physics

Date

2004

Author

Çipiloğlu, M. Ali

Metadata

Show full item record

Item Usage Stats

177
views

0
downloads

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

Suggestions

OpenMETU
Core

Thermomagnetic effects of nondegenerate Kane semiconductors under the conditions of mutual electron-phonon drag in high electric and arbitrary magnetic fields Babaev, MM; Gassym, TM; Tas, M; Tomak, Mehmet (IOP Publishing, 2005-06-01) The thermopower and Nemst-Ettingshausen (NE) effect of nondegencrate Kane semiconductors are investigated by taking into account the electron and phonon heating and their arbitrary mutual drag. The electron spectrum is taken in the Kane two-band form. The electric and magnetic field dependences of the electronic and phonon parts of the thermoelectric and NE coefficients and voltages are obtained in analytical forms. It is shown that the mutual drag of electrons and phonons and degree of nonparabolicity of t...
THERMODYNAMIC QUANTITIES AT HIGH PRESSURES IN THE i AND theta PHASES OF SOLID NITROGEN DEDUCED BY RAMAN FREQUENCY SHIFTS FOR THE INTERNAL MODES IN LITERATURE Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2013-04-10) The pressure dependence of the Raman frequencies of the internal modes is analyzed (T = 300 K) for the phases i and theta of solid nitrogen using the experimental data from the literature. Through the mode Gruneisen parameter, the isothermal compressibility kappa(T), thermal expansion alpha(p) and the specific heat C-p - C-v are calculated as a function of pressure using the Raman data in these phases.
Thermobaric and enhanced blast explosives (TBX and EBX) Türker, Burhan Lemi (2016-12-01) In this review, excerpts from the literature of thermobaric (TBX) and enhanced blast explosives (EBX) that are concentrated on studies that include their compositions, properties, reactive metal components, modeling and computations are presented. (C) 2016 The Author. Production and hosting by Elsevier B. V. on behalf of China Ordnance Society.
Thermo-oxidative reactions of crude oils Kök, Mustafa Verşan (Springer Science and Business Media LLC, 2011-08-01) In this research, thermo-oxidative reactions of crude oils of different origin are determined in limestone matrix using simultaneous thermogravimetry and differential thermal analysis (TG-DTA) systems. Two different reaction regions were identified known as low temperature (LTO) and high temperature oxidation (HTO). Kinetic parameters of the samples were determined by four different methods and the results are discussed.
Thermoluminescence properties of Al doped ZnO nanoparticles IŞIK, MEHMET; Hasanlı, Nızamı (Elsevier BV, 2018-08-15) ZnO nanoparticles doped with aluminum (AZO nanoparticles) were investigated using low temperature thermoluminescence (TL) and structural characterization experiments. TL experiments were performed on AZO nanoparticles in the temperature range of 10-300 K. TL curve presented one intensive peak around 123 K and two overlapped peaks to intensive peak around 85 and 150 K for heating rate of 0.1 K/s. Curve fitting and initial rise methods were used to find the activation energies of associated trapping centers. ...

Citation Formats

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