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      Ultrathin β-tellurium layers grown on highly oriented pyrolytic graphite by molecular-beam epitaxy

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          Abstract

          Molecular-beam epitaxy of ultrathin β-tellurium layers on highly oriented pyrolytic graphite.

          Abstract

          Monolayer tellurium (Te) or tellurene has been suggested by a recent theory as a new two-dimensional (2D) system with great electronic and optoelectronic promises. Here we present an experimental study of epitaxial Te deposited on highly oriented pyrolytic graphite (HOPG) by molecular-beam epitaxy. Scanning tunneling microscopy of ultrathin layers of Te reveals rectangular surface cells with the cell size consistent with the theoretically predicted β-tellurene, whereas for thicker films, the cell size is more consistent with that of the [101̄0] surface of the bulk Te crystal. Scanning tunneling spectroscopy measurements show that the films are semiconductors with the energy band gaps decreasing with increasing film thickness, and the gap narrowing occurs predominantly at the valence-band maximum (VBM). The latter is understood by strong coupling of states at the VBM but a weak coupling at conduction band minimum (CBM) as revealed by density functional theory calculations.

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          Most cited references 32

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          Generalized Gradient Approximation Made Simple

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            From ultrasoft pseudopotentials to the projector augmented-wave method

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              Projector augmented-wave method

               P. Blöchl (1994)
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                Author and article information

                Affiliations
                [1 ]Physics Department
                [2 ]The University of Hong Kong
                [3 ]Hong Kong
                [4 ]College of Physics and Materials Science
                [5 ]Henan Normal University
                [6 ]Xinxiang
                [7 ]China
                [8 ]School of Physics and Electronic Engineering
                Journal
                NANOHL
                Nanoscale
                Nanoscale
                Royal Society of Chemistry (RSC)
                2040-3364
                2040-3372
                2017
                2017
                : 9
                : 41
                : 15945-15948
                10.1039/C7NR04085G
                © 2017
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C7NR04085G

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