QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: zhangguangping on May 13, 2018, 08:43

Title: How to calculated a bend two-probe system in ATK?
Post by: zhangguangping on May 13, 2018, 08:43

Dear ATK supporters,

I am wondering whether ATK can calculate a two-probe system with bend angle, like the one in the following article

 http://pubs.rsc.org/en/Content/ArticleLanding/2018/CP/C7CP08462E#!divAbstract

Thanks in advance.

/Guang-Ping Zhang

Title: Re: How to calculated a bend two-probe system in ATK?
Post by: Petr Khomyakov on May 14, 2018, 13:16

QuantumATK assumes that the electrodes attached to the central region of the device are periodic in the C (z)-direction. If you cannot make them periodic, then you will not be able to do transport calculations for such as a system, using the current implementation of the NEGF formalism in the QuantumATK.  One would have to implement a multiterminal NEGF approach for this kind of calculations, combined with a multigrid method.

Title: Re: How to calculated a bend two-probe system in ATK?
Post by: zhangguangping on May 14, 2018, 15:33

Quote from: Petr Khomyakov on May 14, 2018, 13:16

QuantumATK assumes that the electrodes attached to the central region of the device are periodic in the C (z)-direction. If you cannot make them periodic, then you will not be able to do transport calculations for such as a system, using the current implementation of the NEGF formalism in the QuantumATK.  One would have to implement a multiterminal NEGF approach for this kind of calculations, combined with a multigrid method.

Dear Petr Khomyakov,

Thanks for your reply.
It should be pointed that it is periodic for the right electrode in the C (z)-direction. Meanwhile, the point is that the vector A of the right electrode has a projection along z-direction. Is it allowed in ATK?

With best regards,

/Guang-Ping Zhang

Title: Re: How to calculated a bend two-probe system in ATK?
Post by: Petr Khomyakov on May 14, 2018, 16:37

If I divide the right electrode into layers with out-of-plane direction along the z-axis, the right electrode does not look like periodic in the z-direction.

Title: Re: How to calculated a bend two-probe system in ATK?
Post by: zhangguangping on May 15, 2018, 03:30

Quote from: Petr Khomyakov on May 14, 2018, 16:37

If I divide the right electrode into layers with out-of-plane direction along the z-axis, the right electrode does not look like periodic in the z-direction.

Dear Petr Khomyakov,

Thanks very much for your reply. As shown in the attached figure, the vector A of the right electrode has a projection along z direction. Meanwhile, as shown in (b), it can be periodic. If I understand correct, in this case, ATK can not solve this case.

Thanks very much.

/Guang-Ping Zhang