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Charge transfer between van der Waals coupled metallic 2D layers

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Title: Charge transfer between van der Waals coupled metallic 2D layers
Authors: Matta, Bharti, Rosenzweig, Philipp, Polley, Craig, Starke, Ulrich, Küster, Kathrin
Contributors: Lund University, MAX IV Laboratory, Lunds universitet, MAX IV-laboratoriet, Originator, Lund University, MAX IV Laboratory, MAX IV, Science division, Lunds universitet, MAX IV-laboratoriet, MAX IV, Vetenskapsavdelning, Originator
Source: Nanoscale. 17(33):19317-19323
Subject Terms: Natural Sciences, Physical Sciences, Condensed Matter Physics (including Material Physics, Nano Physics), Naturvetenskap, Fysik, Den kondenserade materiens fysik (Här ingår: Materialfysik, nanofysik)
Description: Van der Waals heterostructures have become a rapidly growing field in condensed matter research, offering a platform to engineer novel quantum systems by stacking different two-dimensional (2D) materials. A diverse range of material combinations, including hexagonal boron nitride, transition metal dichalcogenides and graphene, with electronic properties spanning from insulating to semiconducting, metallic, and semimetallic, have been explored to tune the properties of these heterostacks. However, understanding the interactions and charge transfer between the stacked layers remains challenging, particularly when more than two layers are involved. In this study, we investigate the charge transfer in a potassium-adlayer/graphene/lead-monolayer heterostructure stacked on a SiC substrate. Using synchrotron-based angle-resolved photoemission spectroscopy, we analyze the band structure of each layer, focusing on the charge transfer from K to the underlying 2D layers. Since K forms a (2 × 2) overlayer with respect tographene, the amount of charge carriers donated by K can be determined. Our findings reveal that adsorption of K not only leads to a significant n-doping of the adjacent graphene layer but also to an electron transfer into the Pb monolayer. Remarkably, ≈44% of the electrons donated by the K adlayer are transferred into its second nearest neighbouring layer, i.e. Pb, while ≈56% remain in the graphene.
Access URL: https://doi.org/10.1039/d5nr01368b
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  Data: Charge transfer between van der Waals coupled metallic 2D layers
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  Data: <searchLink fieldCode="AR" term="%22Matta%2C+Bharti%22">Matta, Bharti</searchLink><br /><searchLink fieldCode="AR" term="%22Rosenzweig%2C+Philipp%22">Rosenzweig, Philipp</searchLink><br /><searchLink fieldCode="AR" term="%22Polley%2C+Craig%22">Polley, Craig</searchLink><br /><searchLink fieldCode="AR" term="%22Starke%2C+Ulrich%22">Starke, Ulrich</searchLink><br /><searchLink fieldCode="AR" term="%22Küster%2C+Kathrin%22">Küster, Kathrin</searchLink>
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  Data: Lund University, MAX IV Laboratory, Lunds universitet, MAX IV-laboratoriet, Originator<br />Lund University, MAX IV Laboratory, MAX IV, Science division, Lunds universitet, MAX IV-laboratoriet, MAX IV, Vetenskapsavdelning, Originator
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  Data: <i>Nanoscale</i>. 17(33):19317-19323
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  Data: <searchLink fieldCode="DE" term="%22Natural+Sciences%22">Natural Sciences</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+Sciences%22">Physical Sciences</searchLink><br /><searchLink fieldCode="DE" term="%22Condensed+Matter+Physics+%28including+Material+Physics%22">Condensed Matter Physics (including Material Physics</searchLink><br /><searchLink fieldCode="DE" term="%22Nano+Physics%29%22">Nano Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Naturvetenskap%22">Naturvetenskap</searchLink><br /><searchLink fieldCode="DE" term="%22Fysik%22">Fysik</searchLink><br /><searchLink fieldCode="DE" term="%22Den+kondenserade+materiens+fysik+%28Här+ingår%3A+Materialfysik%22">Den kondenserade materiens fysik (Här ingår: Materialfysik</searchLink><br /><searchLink fieldCode="DE" term="%22nanofysik%29%22">nanofysik)</searchLink>
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  Data: Van der Waals heterostructures have become a rapidly growing field in condensed matter research, offering a platform to engineer novel quantum systems by stacking different two-dimensional (2D) materials. A diverse range of material combinations, including hexagonal boron nitride, transition metal dichalcogenides and graphene, with electronic properties spanning from insulating to semiconducting, metallic, and semimetallic, have been explored to tune the properties of these heterostacks. However, understanding the interactions and charge transfer between the stacked layers remains challenging, particularly when more than two layers are involved. In this study, we investigate the charge transfer in a potassium-adlayer/graphene/lead-monolayer heterostructure stacked on a SiC substrate. Using synchrotron-based angle-resolved photoemission spectroscopy, we analyze the band structure of each layer, focusing on the charge transfer from K to the underlying 2D layers. Since K forms a (2 × 2) overlayer with respect tographene, the amount of charge carriers donated by K can be determined. Our findings reveal that adsorption of K not only leads to a significant n-doping of the adjacent graphene layer but also to an electron transfer into the Pb monolayer. Remarkably, ≈44% of the electrons donated by the K adlayer are transferred into its second nearest neighbouring layer, i.e. Pb, while ≈56% remain in the graphene.
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