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. 2016 Feb 19;7:10559. doi: 10.1038/ncomms10559

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(a) Energy-momentum ARPES dispersion showing a gapless Dirac cone in pure Bi₂Se₃ films after deposition of 0.3 monolayer Mn at 30 K on the surface. Measurements are performed at the same temperature using 50 eV photon energy. (b) EDCs extracted from the measurements shown in a. The red curves in a and b emphasize the EDC in normal emission (k_||=0).