QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: qingling on August 26, 2010, 08:59

Title: How to calculate the differential conductance?
Post by: qingling on August 26, 2010, 08:59

Hello, everyone!
I ofen see  the differential conductance was calculated as a property of electron transport in many papers.  I search through the ATK manual and the forum, but do not know how to calculate it ? I now only know the method to calculate the conductance at zero bias.  I hope someone can give me a detailed input file.
Thank you very much!

Title: Re: How to calculate the differential conductance?
Post by: qingling on August 26, 2010, 16:10

Hope someone can give me a helpful suggestion!!!

Title: Re: How to calculate the differential conductance?
Post by: Anders Blom on August 26, 2010, 23:17

In principle it's very simple, right: compute the I-V curve and differentiate it. Of course, in practice it's not that simple because it's very hard to get so many points on the I-V curve that you get an accurate estimate of the numerical derivative.

In the new version of ATK ( 10.8 ) we have implemented a new function to get the differential conductance. You can read more about it at http://quantumwise.com/documents/manuals/latest/ReferenceManual/XHTML/ref.transmissionspectrum.html (scroll down to "Object methods").

Title: Re: How to calculate the differential conductance?
Post by: qingling on September 8, 2010, 14:46

Thank you for your help!!