QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: Yu Hailin on April 19, 2012, 07:12

Title: About transmission eigenvalue and transmission eigenstat.
Post by: Yu Hailin on April 19, 2012, 07:12

Dear all,
     I have some questions about transmission eigenvalue and transmission eigenstat.
1. The transmission eigenvalue equal to the transmission coefficient, while transmission coefficient dependes on K (kx, ky), it means the transmission eigenvalue is also K-point dependent? Or the transmission coefficient here refer to the sum of T(K)?

2. How to set the K-points when calcualte the transmission eigenvalue and transmission eigenstat for Fe/MgO/Fe MTJ? As question 1 refered, if the transmission eigenvalue is K-point depened, it need to supply a k-points list? Or if not, how large a k-point (such as 9x9, 16x16) is enough? what is the criterion?

3. Is it possible to perform transmission eigenstat calculation with more than one quantum number? How to set the K-points?

Thanks in advance!

Title: Re: About transmission eigenvalue and transmission eigenstat.
Post by: kstokbro on April 20, 2012, 08:54

1. It is k-point dependent, and calculated for a specific k-point. The k-point can be set from the VNL interface.
2. You need to calculate then transmission eigenvalues and eigenstates, one by one.
3. You need to do the calculation for many quantumnumbers one by one
I attach some examples for you inspiration

Title: Re: About transmission eigenvalue and transmission eigenstat.
Post by: Yu Hailin on April 23, 2012, 05:01

Thank you very much!