High-performance thermoelectricity in quantum-Hall Corbino structures

We study the thermoelectric response of Corbino structures in the quantum Hall effect using a resistive central heater. We present measurements of the thermoelectric voltage developed across the radius of the sample along with a theoretical analysis of these experiments. Our results indicate that the thermoelectric response is originated in the electrons, without effects introduced by the electron-phonon interaction. On this basis we estimate the figure of merit of the device and we show that it is very promising for a high-performance thermoelectrical cooling and heat-engine operation, particularly for partially filled Landau levels and high magnetic fields.