Can I read Unconventional Metallicity and Giant Thermopower in a Strongly Interacting Two Dimensional Electron System on EtoBox?

Unconventional Metallicity and Giant Thermopower in a Strongly Interacting Two Dimensional Electron System by Narayan, Vijay; Goswami, Srijit; Pepper, Michael; Griffiths, Jonathan; Beere, Harvey; Sfigakis, Francois; Jones, Geb; Ritchie, Dave; Ghosh, Arindam is a scholarly article available to read on EtoBox.

What is Unconventional Metallicity and Giant Thermopower in a Strongly Interacting Two Dimensional Electron System about?

We present thermal and electrical transport measurements of low-density (10$^{14}$ m$^{-2}$), mesoscopic two-dimensional electron systems (2DESs) in GaAs/AlGaAs heterostructures at sub-Kelvin temperatures. We find that even in the supposedly strongly localised regime, where the electrical resistivity of the system is two orders of magnitude greater than the quantum of resistance $h/e^2$, the thermopower decreases linearly with temperature indicating metallicity. Remarkably, the magnitude of the thermopower exceeds the predicted value in non-interacting metallic 2DESs at similar carrier densities by over two orders of magnitude. Our results indicate a new quantum state and possibly a novel class of itinerant quasiparticles in dilute 2DESs at low temperatures where the Coulomb interaction plays a pivotal role.

Author

Narayan, Vijay; Goswami, Srijit; Pepper, Michael; Griffiths, Jonathan; Beere, Harvey; Sfigakis, Francois; Jones, Geb; Ritchie, Dave; Ghosh, Arindam

Published

2012

Language

EN