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. 2016 May 27;7:11631. doi: 10.1038/ncomms11631

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(a) A sketch of a van der Pauw device with a back-gate electrode. (b) Electron mobility at 2 K for various samples as a function of carrier density. The data in literatures¹⁵,¹⁶,¹⁷,¹⁸,¹⁹,²⁰ are also plotted for comparison. The inset shows an optical microscope image of the device defined by scratching. Scale bar, 500 μm.