Abstract
We discuss bi-structures with one or two long bonds in the central part of the strained monoatomic chains appearing abruptly as a result of rigid bifurcations of the equilibrium state with increasing strain above some critical value. Bi-structures of this type were initially revealed in the model of the monoatomic chains with the Lennard-Jones interactions (L-J model). Such structures are universal because they must exist in the finite strained chains of any physical nature. We confirmed this statement for the strained chains of carbon and boron atoms with the aid of the density functional theory using results obtained in the simulation of the L-J model as initial approximation. The properties of these bi-structures, depending on the length of the chains, are investigated in detail. It is assumed that the abrupt change in the electrical properties of strained carbon and boron chains in the vicinity of the above bifurcations can be used to create nanodevices within the framework of straintronics.
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