Charge transfer between van der Waals coupled metallic 2D layers
(2025) In Nanoscale 17(33). p.19317-19323- Abstract
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... (More)
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 to graphene, 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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- author
- Matta, Bharti ; Rosenzweig, Philipp ; Polley, Craig LU ; Starke, Ulrich and Küster, Kathrin
- organization
- publishing date
- 2025-08-21
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nanoscale
- volume
- 17
- issue
- 33
- pages
- 7 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:105013791536
- pmid:40768204
- ISSN
- 2040-3364
- DOI
- 10.1039/d5nr01368b
- language
- English
- LU publication?
- yes
- id
- 9aeecc3b-959d-4cd9-9fb0-d8881670a3ba
- date added to LUP
- 2025-11-05 13:40:53
- date last changed
- 2025-11-05 13:41:41
@article{9aeecc3b-959d-4cd9-9fb0-d8881670a3ba,
abstract = {{<p>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 to graphene, 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.</p>}},
author = {{Matta, Bharti and Rosenzweig, Philipp and Polley, Craig and Starke, Ulrich and Küster, Kathrin}},
issn = {{2040-3364}},
language = {{eng}},
month = {{08}},
number = {{33}},
pages = {{19317--19323}},
publisher = {{Royal Society of Chemistry}},
series = {{Nanoscale}},
title = {{Charge transfer between van der Waals coupled metallic 2D layers}},
url = {{http://dx.doi.org/10.1039/d5nr01368b}},
doi = {{10.1039/d5nr01368b}},
volume = {{17}},
year = {{2025}},
}