Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: 2D Semiconductors and van der Waals Heterostructures I

HL 2.12: Vortrag

Montag, 17. März 2025, 12:30–12:45, H15

Microscopic comparison of TMD and QW laser capabilities — •Tommy Schulz, Daniel Erben, Alexander Steinhoff, and Frank Jahnke — Institut für theoretische Physik, Bremen, Germany

The lasing capabilities of monolayer transition metal dichalcogenides (TMDs) are compared to quantum wells (QWs). For material-realistic calculations of the optical gain we connect tight-binding bandstructures for TMDs and k^→ · p^→ band structures for QWs and the respective interaction matrix elements with state of the art many-body theory. The semiconductor Bloch equations are solved for highly excited materials, where Coulomb interaction is treated selfconsistently on a GW level together with carrier-phonon interaction. While TMDs provide larger material gain, they also exhibit large shifts of the peak gain with increasing high excitation densitiy, thereby limiting the lasing capabilities.

Keywords: TMD; Quantum Well; Laser; Many-Body-Theory; Material Gain