High electron mobility, quantum Hall effect and anomalous optical response in atomically thin InSe

Bandurin, Denis A. and Tyurnina, Anastasia V. and Yu, Geliang L. and Mishchenko, Artem and Zólyomi, Viktor and Morozov, Sergey V. and Kumar, Roshan Krishna and Gorbachev, Roman V. and Kudrynskyi, Zakhar R. and Pezzini, Sergio and Kovalyuk, Zakhar D. and Zeitler, Uli and Novoselov, Konstantin S. and Patanè, Amalia and Eaves, Laurence and Grigorieva, Irina V. and Fal'ko, V.I. and Geim, Andre K. and Cao, Yang (2016) High electron mobility, quantum Hall effect and anomalous optical response in atomically thin InSe. Nature Nanotechnology . ISSN 1748-3395

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A decade of intense research on two-dimensional (2D) atomic crystals has revealed that their properties can differ greatly from those of the parent compound. These differences are governed by changes in the band structure due to quantum confinement and are most profound if the underlying lattice symmetry changes. Here we report a high-quality 2D electron gas in few-layer InSe encapsulated in hexagonal boron nitride under an inert atmosphere. Carrier mobilities are found to exceed 10₃ cm₂ V−¹ s−¹ and 10⁴cm₂ V−¹ s−¹ at room and liquid-helium temperatures, respectively, allowing the observation of the fully developed quantum Hall effect. The conduction electrons occupy a single 2D subband and have a small effective mass. Photoluminescence spectroscopy reveals that the bandgap increases by more than 0.5 eV with decreasing the thickness from bulk to bilayer InSe. The band-edge optical response vanishes in monolayer InSe, which is attributed to the monolayer’s mirror-plane symmetry. Encapsulated 2D InSe expands the family of graphene-like semiconductors and, in terms of quality, is competitive with atomically thin dichalcogenides and black phosphorus.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1038/nnano.2016.242
Depositing User: Eprints, Support
Date Deposited: 22 Nov 2016 10:00
Last Modified: 19 Jul 2017 22:06
URI: http://eprints.nottingham.ac.uk/id/eprint/38877

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