LAUSR

We show that in quantum waveguides, the Fano resonance profile associated with propagating modes has its analogs with evanescent modes as well. This is found to be an unusual and a universal effect for any attractive potential. Further, we show that quantum dots or attractive impurity potentials embedded in the interior of a quantum waveguide yield significantly large Seebeck coefficient (thermopower) and power factor. Hence, they are good candidates for enhancing the thermoelectric energy conversion efficiency. We study the effect of a waveguide tapering on transport properties for the first time and the effect of curvature on the transmission coefficients. We propose a nanoscale current rectification device in two dimensions using tapered quantum waveguides.We show that in quantum waveguides, the Fano resonance profile associated with propagating modes has its analogs with evanescent modes as well. This is found to be an unusual and a universal effect for any attractive potential. Further, we show that quantum dots or attractive impurity potentials embedded in the interior of a quantum waveguide yield significantly large Seebeck coefficient (thermopower) and power factor. Hence, they are good candidates for enhancing the thermoelectric energy conversion efficiency. We study the effect of a waveguide tapering on transport properties for the first time and the effect of curvature on the transmission coefficients. We propose a nanoscale current rectification device in two dimensions using tapered quantum waveguides.