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General Questions and Answers / Negative zero bias conductance
« on: September 24, 2013, 13:32 »
I am calculating zero bias conductances (ZBC) for narrow width twisted armchair graphene nanoribbons. For 3-AGNR and 5-AGNR (width) i am getting low but positive values..something like 10-18 and 10-9 Siemens respectively.... but for 4-AGNR (width) these values are low and NEGATIVE.
Why i am getting negative zero bias conductance?? Is it possible? I have kept same conditions for calculations of all three 'width' cases. Do i need to increase the (+E,-E) energy window of transmission. Right now it is (+2eV -2eV) See attached screenshot of transmission and 'negative' value of ZBC..
Why i am getting negative zero bias conductance?? Is it possible? I have kept same conditions for calculations of all three 'width' cases. Do i need to increase the (+E,-E) energy window of transmission. Right now it is (+2eV -2eV) See attached screenshot of transmission and 'negative' value of ZBC..