Spin-valley information and energy transport via directed exciton currents in two-dimensional semiconductors
Final Report Abstract
Excitons in monolayers of semiconductor materials have been in the focus of semiconductor research in the past years due to intriguing novel physical phenomena arising from the 2D character of these materials. Hower, the spatial control of such excitons on the nanoscale, necessary for the fabrication of any form of logical device, stands as a particular challenge due to the lack of a charge in excitons that is usually used for this purpose. In this project the main goal was to investigate a novel approach to control and manipulate the excitons by applying local potentials and magnetic fields through structured interfaces. Despite the project being terminated already after one year (instead of the proposed two years) the most important proposed mechanism that can be used for controlling excitons in this approach could already be proven. It was shown that nanostructured dielectric substrates can be coupled to monolayers of semiconducting materials over large areas while maintaining the extremely high quality and properties of the materials. At the same time, these structured substrates then imprint locally confined, ultra-sharp energy gradients, proofing that it basically allows to create any form of energy landscape imaginable, limited just by the possibilities of nanofabrication technologies. The studies of the exciton propagation properties in these structures showed first promising results but was still ongoing when the project was terminated and studies are still being continued.
Publications
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Directing exciton propagation in monolayer TMDCs through patterned dielectric substrates, APS March Meeting, Chicago – contributed talk (2022)
J Zipfel et al.
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Hyperspectral imaging of exciton confinement within a moiré unit cell with a subnanometer electron probe. Science, 378(6625), 1235-1239.
Susarla, Sandhya; Naik, Mit H.; Blach, Daria D.; Zipfel, Jonas; Taniguchi, Takashi; Watanabe, Kenji; Huang, Libai; Ramesh, Ramamoorthy; da, Jornada Felipe H.; Louie, Steven G.; Ercius, Peter & Raja, Archana
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Optimizing cathodoluminescence microscopy of buried interfaces through nanoscale heterostructure design. Nanoscale, 14(20), 7569-7578.
Francaviglia, Luca; Zipfel, Jonas; Carlstroem, Johan; Sridhar, Sriram; Riminucci, Fabrizio; Blach, Daria; Wong, Ed; Barnard, Edward; Watanabe, Kenji; Taniguchi, Takashi; Weber-Bargioni, Alexander; Ogletree, D. Frank; Aloni, Shaul & Raja, Archana
