Please use this identifier to cite or link to this item:
|Title:||Large frequency change with thickness in interlayer breathing mode — significant interlayer interactions in few layer black phosphorus||Authors:||Luo, Xin
Koon, Gavin Kok Wai
Castro Neto, Antonio H.
Quek, Su Ying
|Keywords:||Science::Physics||Issue Date:||2015||Source:||Luo, X., Lu, X., Koon, G. K. W., Castro Neto, A. H., Özyilmaz, B., Xiong, Q., & Quek, S. Y. (2015). Large frequency change with thickness in interlayer breathing mode — significant interlayer interactions in few layer black phosphorus. Nano Letters, 15(6), 3931-3938. doi:10.1021/acs.nanolett.5b00775||Journal:||Nano Letters||Abstract:||Bulk black phosphorus (BP) consists of puckered layers of phosphorus atoms. Few-layer BP, obtained from bulk BP by exfoliation, is an emerging candidate as a channel material in post-silicon electronics. A deep understanding of its physical properties and its full range of applications are still being uncovered. In this paper, we present a theoretical and experimental investigation of phonon properties in few-layer BP, focusing on the low-frequency regime corresponding to interlayer vibrational modes. We show that the interlayer breathing mode A3g shows a large redshift with increasing thickness; the experimental and theoretical results agree well. This thickness dependence is two times larger than that in the chalcogenide materials, such as few-layer MoS2 and WSe2, because of the significantly larger interlayer force constant and smaller atomic mass in BP. The derived interlayer out-of-plane force constant is about 50% larger than that of graphene and MoS2. We show that this large interlayer force constant arises from the sizable covalent interaction between phosphorus atoms in adjacent layers and that interlayer interactions are not merely of the weak van der Waals type. These significant interlayer interactions are consistent with the known surface reactivity of BP and have been shown to be important for electric-field induced formation of Dirac cones in thin film BP.||URI:||https://hdl.handle.net/10356/140423||ISSN:||1530-6984||DOI:||10.1021/acs.nanolett.5b00775||Rights:||This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.5b00775||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
Files in This Item:
|Large Frequency Change with Thickness in Interlayer Breathing.pdf||1.06 MB||Adobe PDF||View/Open|
Updated on Mar 10, 2021
Updated on Mar 9, 2021
Updated on Jul 26, 2021
Updated on Jul 26, 2021
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.