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Kemp, Z, Carvajal-Carmona, L, Spain, S, Barclay, E, Gorman, M, Martin, L, Jaeger, E, Brooks, N, Bishop, DT, Thomas, H, Tomlinson, I, Papaemmanuil, E, Webb, E, Sellick, GS, Wood, W, Evans, G, Lucassen, A, Maher, ER, Houlston, RS, and Identificat, CTG

Spain, S. G., Yaşayan, G., Soliman, M., Heath, F., Saeed, A. O., and Cameron Alexander

Quereda J., Palacios J.J., Agräit N., Castellanos-Gomez A., Rubio-Bollinger G. and The authors acknowledge Victor Rubio for kindly providing indium tin oxide samples. GR-B, NA and JQ acknowledge financial support from MICINN/ MINECO through program MAT2014-57915-R, from Comunidad Aut?noma de Madrid through program S2013/MIT-3007 (MAD2D) and from the European Commission under the Graphene Flagship, contract CNECTICT-604391. AC-G acknowledges financial support from the BBVA Foundation through the fellowship ?I Convocatoria de Ayudas Fundacion BBVA a Investigadores, Innovadores y Creadores Culturales?, from the MINECO (Ram?n y Cajal 2014 program, RYC-2014-01406) and from the MICINN (MAT2014- 58399-JIN). JJP acknowledges Spain?s Ministerio de Econom?a y Competitividad for financial support under grant FIS2013-47328-C02-1 and the Generalitat Valenciana under grant no. PROMETEO/2012/011. Note added. During the preparation of this manuscript an article appeared showing mechanically tunable electrical performance in a vertical metal/ semiconductor/metal atomically thin structure [44], where few-layer black phosphorus is used as semiconducting layer instead of the atomically thin MoS2 layer considered in our work. Interestingly, while the I?V characteristics presented in their article almost remain unchanged when the sign of bias voltage is reversed, here we obtain markedly asymmetric I?V characteristics, leading to a strong rectifying behavior.

Murli, A., Casaburi, D., Marcellino, Livia, Galletti, Ardelio, D'Amore, L., H. Adeli (USA), J. A. López-Ramos (Spain), S. Oharu (Japan), J. Ranilla (Spain), J. Rosenthal (Switzerland), N. Stollenwerk (Germany), Ezio Venturino (Italy) and Bruce A. Wade (USA), Murli, Almerico, Casaburi, D., D'Amore, Luisa, Galletti, A., and Marcellino, L.