Semiconductor Plasma

IMGP1323
Experimental photograph of laser-pumped dense plasma condensation (EHL) in 2D semiconductors measured with time-resolved photoluminescence, absorption, and second harmonic generation microscopy. – Photograph taken by A. Bataller in the Gundogdu Laboratory at North Carolina State University.

The physics of dense plasma finds validity in both real and quasiparticle charged systems.  My current research at NCSU explores a parameter space that is largely inaccessible in atomic plasmas, but is readily found in solid-state structures.  The temperature-density scaling relationships that determine many-body interactions, and ultimately condensation, can be realized for the electronic excitation quasiparticle (exciton) in semiconductors. This relatively low-energy platform grants access to a parameter space occupied by liquid condensation and  is heavily influenced by quantum effects. In the nearly 50 years since its discovery, electron-hole liquid (EHL) created within bulk semiconductors has been limited to cryogenic temperatures, and is often generated with high-intensity pulsed lasers. Due to their quantum confinement, reduced material screening, and long charge lifetime, the class of 2D semiconductors known as transition metal dichalcogenides are ideal materials for high-temperature EHL formation. At NCSU, we have recently discovered EHL condensation in monolayer molybdenum disulfide, which can be created above room temperature using less excitation power than a laser pointer!

This work is currently under review for a high-impact journal; the arXiv version can be found here.  MUCH MORE TO COME!