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The effect of stretching on the three nearest neighbor bond directions when is applied along various high symmetry directions. The dotted lines in (b)–(d) are the regular unstretched orientations. The magnitude of has been chosen to be very large to emphasize the effect of stretching; however, our numerical results will only go as high as .
The stretching induced anisotropy in the longitudinal conductance for three small pseudoforce values at . These correspond to bond stretching angles of ≈0.4°, 1.2°, and 2° for , respectively. Despite the relatively small stretching angle, the induced anisotropy is as much as 10%. The angular dependence of this quantity is quite well behaved. When stretching along the zigzag direction, the zigzag longitudinal conductance is increased, and similarly for stretching along the armchair direction. For stretching of , the system remains isotropic.
The transverse optical conductance as a function of stretching angle, with . Interestingly, even thought the symmetry is broken for stretching along the high symmetry directions, the transverse conductance remains zero. For chiral stretching this is not the case. Maximum stretching is reached for the longitudinally isotropic value of .
The transverse (Hall) conductance for and . The transverse conductance reaches a maximum of at the high density of states saddle point .
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