Spectromicroscopy at the limit of few-atom thickness
Similar to graphene, many layered materials can be exfoliated down a thickness of few atomic layers, with properties of such layers often dramatically different compared to the bulk.
We studied thickness dependence of the band dispersions in transition metal di-chalcogenides (TMDCs). We also studied spectroscopic signatures in the angle-resolved photomission maps from twisted TMDC layers. In collaboration with the group from RWTH Aachen we have studied magnetic phase transition in MnPS3 and FePS3 exfoliated flakes.
We are currently pursuing a program to enable spectroscopic access to single magnetic domains in various materials, including ultra-thin exfoliated layers, using micro-focused photoemission.
Publications
Benjamin Pestka, Jeff Strasdas, Gustav Bihlmayer, Adam Krzysztof Budniak, Marcus Liebmann, Niklas Leuth, Honey Boban, Vitaliy Feyer, Iulia Cojocariu, Daniel Baranowski, Simone Mearini, Yaron Amouyal, Lutz Waldecker, Bernd Beschoten, Christoph Stampfer, Lukasz Plucinski, Efrat Lifshitz, Peter Kratzer, Markus Morgenstern, ACS Nano 18, 32924 (2024), https://doi.org/10.1021/acsnano.4c12520
Jeff Strasdas, Benjamin Pestka, Miłosz Rybak, Adam K Budniak, Niklas Leuth, Honey Boban, Vitaliy Feyer, Iulia Cojocariu, Daniel Baranowski, José Avila, Pavel Dudin, Aaron Bostwick, Chris Jozwiak, Eli Rotenberg, Carmine Autieri, Yaron Amouyal, Lukasz Plucinski, Efrat Lifshitz, Magdalena Birowska, and Markus Morgenstern, “Electronic Band Structure Changes across the Antiferromagnetic Phase Transition of Exfoliated MnPS3 Flakes Probed by μ-ARPES”, Nano Letters 23, 10342 (2023), https://doi.org/10.1021/acs.nanolett.3c02906
Bharti Parashar, Lars Rathmann, Hyun-Jung Kim, Iulia Cojocariu, Aaron Bostwick, Chris Jozwiak, Eli Rotenberg, José Avila, Pavel Dudin, Vitaliy Feyer, Christoph Stampfer, Bernd Beschoten, Gustav Bihlmayer, Claus M. Schneider, and Lukasz Plucinski, “Photoemission study of twisted monolayers and bilayers of WSe2 on graphite substrates”, Phys. Rev. Materials 7, 044004 (2023), https://doi.org/10.1103/PhysRevMaterials.7.044004
M. Gehlmann, I. Aguilera, G. Bihlmayer, S. Nemšák, P. Nagler, P. Gospodarič, G. Zamborlini, M. Eschbach, V. Feyer, F. Kronast, E. Młyńczak, T. Korn, L. Plucinski, Ch. Schüller, S. Blügel, and C. M. Schneider, “Direct observation of the band gap transition in atomically thin ReS2”, Nano Letters 17, 5187 (2017), https://doi.org/10.1021/acs.nanolett.7b00627