Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 22: 2D Materials 8 (joint session DS/CPP)
DS 22.7: Vortrag
Donnerstag, 8. September 2022, 11:00–11:15, H17
Charge-transfer stabilization, modulation doping, and CDW phase in layered ferecrystal heterostructures — •Fabian Göhler1, Shrinidhi Ramasubramanian1, Sanam K. Rajak1, Niels Rösch1, Adrian Schütze1, Susanne Wolff1, Marisa Choffel2, Dmitri L. M. Cordova2, David C. Johnson2, and Thomas Seyller1 — 1Chemitz University of Technology, 09126 Chemnitz, Germany — 2University of Oregon, Eugene 97403, USA
A virtually unlimited number of metastable, layered heterostructures - called ferecrystals due to the non-epitaxial alignment between layers - can be grown via the self-assembly of layered amorphous precursors. [1] In this contribution, we want to highlight recent investigations on the electronic structure and interlayer interactions in several series of compounds using photoemission spectroscopy (PES).
In the Bi-Mo-Se system, the formation of the metallic 1T-polytype of MoSe2 is aided by charge transfer from rock-salt structured BiSe. By systematically stacking BiSe, Bi2Se3, and MoSe2, the mechanisms which stabilize these structures can be understood. [2]
Compounds prepared from PbSe and VSe2 layers show charge transfer between layers as well, allowing to tune transport properties via modulation doping. Additionally, the emergence of a charge density wave in the VSe2 layers has been reported below 100 K [3], and was investigated by angle-resolved PES.
[1] Esters et al., Angew. Chem. Int. Ed. 54, 1130 (2015).
[2] Göhler et al., J. Phys. Chem. C 125, 9469 (2021).
[3] Cordova et al., Chem. Mater. 31, 8473 (2019).