Molecule signatures in photoluminescence spectra of transition metal dichalcogenides
Journal article, 2018

Monolayer transition metal dichalcogenides (TMDs) show an optimal surface-to-volume ratio and are thus promising candidates for novel molecule sensor devices. It was recently predicted that a certain class of molecules exhibiting a large dipole moment can be detected through the activation of optically inaccessible (dark) excitonic states in absorption spectra of tungsten-based TMDs. In this paper, we investigate the molecule signatures in photoluminescence spectra in dependence of a number of different experimentally accessible quantities, such as excitation density, temperature, as well as molecular characteristics including the dipole moment and its orientation, molecule-TMD distance, molecular coverage, and distribution. We show that under certain optimal conditions even room-temperature detection of molecules can be achieved.

Author

Maja Feierabend

Chalmers, Physics, Condensed Matter Theory

Gunnar Berghäuser

Chalmers, Physics, Condensed Matter Theory

Malte Selig

Technische Universität Berlin

Chalmers, Physics, Condensed Matter Theory

Samuel Brem

Chalmers, Physics, Condensed Matter Theory

Timur Shegai

Chalmers, Physics, Bionanophotonics

Siegfried Eigler

Freie Universität Berlin

Ermin Malic

Chalmers, Physics, Condensed Matter Theory

Physical Review Materials

2475-9953 (ISSN)

Vol. 2 1 014004

Subject Categories

Atom and Molecular Physics and Optics

Theoretical Chemistry

Condensed Matter Physics

DOI

10.1103/PhysRevMaterials.2.014004

More information

Latest update

1/24/2019