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. 2018 Jan 25;8:1588. doi: 10.1038/s41598-018-20001-3

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© The Author(s) 2018

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(a) The schematic displays the theory of the valley-selection excitation from the external beam. (b,c) The K₂ and ${K'}_{2}$ valley states are selectively excited by Gaussian beams at different incident directions respectively.