Abstract:
:High electron mobility is one of graphene's key properties, exploited for applications and fundamental research alike. Highest mobility values are found in heterostructures of graphene and hexagonal boron nitride, which consequently are widely used. However, surprisingly little is known about the interaction between the electronic states of these layered systems. Rather pragmatically, it is assumed that these do not couple significantly. Here we study the unoccupied band structure of graphite, boron nitride and their heterostructures using angle-resolved reflected-electron spectroscopy. We demonstrate that graphene and boron nitride bands do not interact over a wide energy range, despite their very similar dispersions. The method we use can be generally applied to study interactions in van der Waals systems, that is, artificial stacks of layered materials. With this we can quantitatively understand the 'chemistry of layers' by which novel materials are created via electronic coupling between the layers they are composed of.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Jobst J,van der Torren AJH,Krasovskii EE,Balgley J,Dean CR,Tromp RM,van der Molen SJdoi
10.1038/ncomms13621subject
Has Abstractpub_date
2016-11-29 00:00:00pages
13621issn
2041-1723pii
ncomms13621journal_volume
7pub_type
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