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. 2016 Jun 27;6:28515. doi: 10.1038/srep28515

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Copyright © 2016, Macmillan Publishers Limited

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(a) The bandgap E_g and (b) effective masses along armchair direction as function of the number of layers N. Bandgaps measured in transport experiments¹⁸ differ from those of optical measurements⁸,³³, and both are shown as reference. The DFT guided TB bandgaps follow the transport measurements more closely for multi-layer phosphorene. (c) The complex band structure of 2L-phosphorene and monolayer WTe₂. The complex bands are plotted at transverse wave-vector K_y = 0 and 0.1π/b for both materials. The area enclosed by the imaginary wave-vector and the vertical axis (i.e. the shaded area) determines the BTBT decay rate. Bilayer phosphorene not only has smaller BTBT decay rate at K_y = 0 due to small transport mass, but also at non-zero K_y due to large transverse m^*.

Inline graphic — (a) The bandgap E_g and (b) effective masses along armchair direction as function of the number of layers N. Bandgaps measured in transport experiments¹⁸ differ from those of optical measurements⁸,³³, and both are shown as reference. The DFT guided TB bandgaps follow the transport measurements more closely for multi-layer phosphorene. (c) The complex band structure of 2L-phosphorene and monolayer WTe₂. The complex bands are plotted at transverse wave-vector K_y = 0 and 0.1π/b for both materials. The area enclosed by the imaginary wave-vector and the vertical axis (i.e. the shaded area) determines the BTBT decay rate. Bilayer phosphorene not only has smaller BTBT decay rate at K_y = 0 due to small transport mass, but also at non-zero K_y due to large transverse m^*.