Serhii Shafraniuk
Northwestern University, USA
Title: Electric and thermal transport in low dimensional junctions
Biography
Biography: Serhii Shafraniuk
Abstract
The whole strategy of the research and development in the area of nanoscience depends on detailed knowledge microscopic mechanisms of the electric and thermal transport. We report our results on the quantized magneto-thermoelectric transport in the C/N-knot formed as crossing between a few atomic layer narrow stripe C and the other metal stripe N, when an external d.c. magnetic field is applied. The temperature gradient in C is created by injecting the non-equilibrium electrons, holes and phonons from the heater thereby directing them toward the C/N-knot. The non-linear coupling between electron states in the C/N-knot counter electrodes causes splitting the heat flow into several fractions owing to the Lorentz force acting in the C/N-knot vicinity, thus inducing the magneto-thermoelectric electric current (MTEC) in N whereas the phonons pass and propagate along C further forward. Thus, the longitudinal flow of heat along C generates a transversal electric current in N showing a series of maximums when dimensions of the Landau orbits and C/N-knot match each other. It allows observing the interplay between the quantum Hall effect and spatial quantization and deduce key parameters of the quantum well. Our results suggest that the magneto-thermoelectric phenomena enable understanding the microscopic mechanisms of transport in the few atomic layer materials and junctions, thereby opening many additional opportunities in a variety of the research and applications. It extends capabilities to determine the parameters of low-dimensional junctions on the nanoscale. Furthermore, the phenomenon can be utilized for the thermoelectric cooling and generation of electricity.