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. 2018 Sep 13;9:3721. doi: 10.1038/s41467-018-05632-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Charge dependence of PL. a Schematic and b optical image of the charge-tuneable device. The red dashed frame highlights the 1L-WSe₂ flake. The scale bar is 5 μm. c Circular co-polarised PL intensity (I_σ+/σ+ + I_σ-/σ-) as a function of applied bias. The dashed lines are a guide to the eye to highlight each peak. d DoP of PL as a function of bias and energy in the same range as (c). The colour code is such that blue regions indicate co-polarisation, whereas the red regions indicate counter-polarisation with respect to excitation polarisation