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Optical Fingerprint of Non-covalently Functionalized Transition Metal Dichalcogenides by Feierabend, Maja; Malic, Ermin; Knorr, Andreas; Berghäuser, Gunnar is a scholarly article available to read on EtoBox.

What is Optical Fingerprint of Non-covalently Functionalized Transition Metal Dichalcogenides about?

Atomically thin transition metal dichalcogenides (TMDs) hold promising potential for applications in optoelectronics. Due to their direct band gap and the extraordinarily strong Coulomb interaction, TMDs exhibit efficient light-matter coupling and tightly bound excitons. Moreover, large spin orbit coupling in combination with circular dichroism allows for spin and valley selective optical excitation. As atomically thin materials, they are very sensitive to changes in the surrounding environment. This motivates a functionalization approach, where external molecules are adsorbed to the materials surface to tailor its optical properties. Here, we apply the density matrix theory to investigate the potential of non-covalently functionalized TMDs. Considering exemplary spiropyran molecules with a strong dipole moment, we predict spectral redshifts and the appearance of an additional side peak in the absorption spectrum of functionalized TMDs. We show that the molecular characteristics, e.g. coverage, orientation and dipole moment, crucially influence the optical properties of TMDs, leaving a unique optical fingerprint in the absorption spectrum. Furthermore, we find that the molecular di

Author

Feierabend, Maja; Malic, Ermin; Knorr, Andreas; Berghäuser, Gunnar

Published

2018

Language

EN