I am wondering if it's possible to set the on site operator "N_up,i", or two operators on the same site.

Question

Hi,
I want to know if it's possible to set two operators on the same site, like these:
ampo +="Cdagup",2,"Cdn",2; or
ampo +="Cdagup",2,"Cup",2;

I have tried these settings and got the errors:

AutoMPO: cannot put two operators on same site in a single term

So, I am wondering how to set the two operators on the same site.

Chenrong Liu

Comments

Hi Chenrong,

I remembered using AutoMPO to make Hamiltonian with two operators on the same site myself before and it didn't cause any error, and I have seen others doing the same thing without any error on this forum, have you checked that you had the latest version of ITensor package? On the other hand, maybe you could use "Nup",2 instead of "Cdagup",2,"Cup",2 or make a new operator to represent the two operator on the same site.

Best,

Yixuan

---

Thank you, I have solved this. I updated the package and it worked well now.

Answer 1

Thanks for the question Chenrong - it's good to keep an eye on these things and glad it's working well now.

Yixuan - thanks for the answer also. Feel free in the future to post an official answer; the forum allows multiple answers as you can see, so it's a good way for people to contribute.

Miles