Molecule signatures in photoluminescence spectra of transition metal dichalcogenides
Artikel i vetenskaplig tidskrift, 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.

Författare

Maja Feierabend

Chalmers, Fysik, Kondenserade materiens teori

Gunnar Berghäuser

Chalmers, Fysik, Kondenserade materiens teori

Malte Selig

Chalmers, Fysik, Kondenserade materiens teori

Technische Universität Berlin

Samuel Brem

Chalmers, Fysik, Kondenserade materiens teori

Timur Shegai

Chalmers, Fysik, Bionanofotonik

Siegfried Eigler

Freie Universität Berlin

Ermin Malic

Chalmers, Fysik, Kondenserade materiens teori

Physical Review Materials

2475-9953 (ISSN)

Vol. 2 014004

Ämneskategorier

Atom- och molekylfysik och optik

Teoretisk kemi

Den kondenserade materiens fysik

DOI

10.1103/PhysRevMaterials.2.014004