Author Topic: Why the conductance is independent on the length of nanowire?  (Read 7809 times)

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Offline hol28

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Hi everyone:
I calculated the conductance of Li-wires with different lengths and found that the values of conductance are almost the same. But as I know, the electrical conductivity is a material property and indepedent on the length and cross section of the material. However, the conductance, which equals conductivity*(cross section)/length, should be inversely proportional to the length. Could someone tell me why my calculated conductance is independent on the length?
Thanks very much! 

Offline zh

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Re: Why the conductance is independent on the length of nanowire?
« Reply #1 on: November 29, 2012, 01:44 »
The conductance in your calculation takes into account only the ballistic conduction.  What you expect is true for the  resistance of the Ohmic contact.

Offline hol28

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Re: Why the conductance is independent on the length of nanowire?
« Reply #2 on: November 29, 2012, 16:40 »
Thanks!
The conductance in your calculation takes into account only the ballistic conduction.  What you expect is true for the  resistance of the Ohmic contact.