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zdhlover(½ð±Ò+2,VIP+0):¶àл½»Á÷·´À¡ 7-24 21:57
In DFT simulation, we usually require that the force exerting on atoms are less than a certain value (i.e, if the force on each atom  reaches a converge criterion). It's meaningless to optimize the structure to make the force be zero for each atom. For the two-probe system, the forces calculated by the NEGF formula is still argued in science and they may be not  reliable.  

The optimization of two-probe system in ATK is indeed converted into the optimization of an equivalent bulk system. The "CalculateAtomicForces()" can not be used to optimize the two-probe system under different bias.
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