Enhanced thermopower in ZnO two-dimensional electron gas

Enhanced thermopower in ZnO two-dimensional electron gas.

Control of dimensionality has proven to be an effective way to manipulate the electronic properties of materials, thereby enabling exotic quantum phenomena, such as superconductivity, quantum Hall effects, and valleytronic effects. Another example is thermoelectricity, which has been theoretically proposed to be favorably controllable by reducing the dimensionality. Here, we verify this proposa...

Highly enhanced thermopower in two-dimensional electron systems at millikelvin temperatures.

We report experimental observation of an unexpectedly large thermopower in mesoscopic two-dimensional (2D) electron systems in GaAs/AlGaAs heterostructures at sub-Kelvin temperatures and zero magnetic field. Unlike conventional nonmagnetic high-mobility 2D systems, the thermopower in our devices increases with decreasing temperature below 0.3 K, reaching values in excess of 100 microV/K, thus e...

Theory of thermopower in two-dimensional graphene

Motivated by recent experiments by Yuri M. Zuev et al. Phys. Rev. Lett. 102, 096807 2009 , Peng Wei et al. Phys. Rev. Lett. 102, 166808 2009 , and Joseph G. Checkelsky et al. Phys. Rev. B 80, 081413 R 2009 , we calculate the thermopower of graphene incorporating the energy dependence of various transport scattering times. We find that scattering by screened charged impurities gives a reasonable...

Two-dimensional electron gas near full polarization

We establish the consistency of the Fermi liquid description and find a relation between the Fermi liquid constants for a two-dimensional electron system near the point of full polarization due to a parallel magnetic field H. Our results enable us to predict connections between different thermodynamic properties of the system. In particular, we find that near the point of full polarization Hc ,...

Two dimensional electron gas at oxide interfaces