Resonant scattering induced thermopower in one-dimensional disordered systems

Article

关键词: QUANTUM-WELL STRUCTURES;    THERMOELECTRIC TRANSPORT;    FIGURE;    FORMULA;    POWER;   

DOI  :  10.1103/PhysRevB.91.205401

来源: SCIE

【 摘 要 】

This study analyzes thermoelectric properties of a one-dimensional random conductor which shows localization effects and simultaneously includes resonant scatterers yielding sharp conductance resonances. These sharp features give rise to a distinct behavior of the Seebeck coefficient in finite systems and incorporate the degree of localization as a means to enhance thermoelectric performance, in principle. The model for noninteracting electrons is discussed within the Landauer-Buttiker formalism such that analytical treatment is possible for a wide range of properties, if a special averaging scheme is applied. The approximations in the averaging procedure are tested with numerical evaluations showing good qualitative agreement, with some limited quantitative disagreement. The validity of low-temperature Mott's formula is determined and a good approximation is developed for the intermediate temperature range. In both regimes the intricate interplay between Anderson localization due to disorder and conductance resonances of the disorder potential is analyzed.

【 授权许可】

Free