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Fig. 1 | Nano Convergence

Fig. 1

From: A perspective on auxetic nanomaterials

Fig. 1

(Reproduced with permission from Jiang and Park [18]. Copyright 2014 Macmillan Publishers Ltd.)

The evolution of local structure in single-layer BP during uniaxial tension in the y-direction. a BP is stretched in the y-direction, i.e. atoms are moved in the direction of the attached arrows (blue online). b To accommodate the tension in the y-direction, BP contracts in the x-direction, i.e. atoms 1 and 4 move inward along the attached arrows (red online). The 1–4 bond thus becomes more closely aligned with the vertical (z)-direction. The green arrows display the movement of the four surrounding atoms following the movement of atoms 1 and 4

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