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dkweiss31 / Schrieffer-Wolff

Computer algebra implementation of a Schrieffer-Wolff Transformation using Mathematica and SNEG
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Question about the runtime of the Schrieffer-Wolff (SW) package！ #1

Closed jsfeng-fudan closed 2 weeks ago

jsfeng-fudan commented 2 weeks ago

I have a question regarding the runtime of the Schrieffer-Wolff (SW) package. When I follow the example provided by the author and run the SW package, the calculation gets stuck when computing the 4th-order perturbation and has been running for 3 days without producing a result. My computing platform is Windows 10 + Mathematica 12 + SNEG 2.0.3.

dkweiss31 commented 2 weeks ago

Hi @jsfeng-fudan! So this package was just making public some code I wrote as part of my thesis, which you can find here, see Appendix A. I'm not certain why the calculation is taking so long on your platform: redownloading the code and running the first example, the fourth order effective Hamiltonian is computed in a few seconds and the sixth-order effective Hamiltonian takes about a minute (the second example is similarly fast). I am using a more outdated version of SNEG 1.250, so I wonder if you try downgrading to that version.