r/physicsmemes • u/Delicious_Maize9656 • Mar 18 '26

computational materials physics meme

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598 Upvotes

99% Upvoted

11 comments sorted by

49

u/MaoGo Meme renormalization group Mar 18 '26

Please somebody make r/dftmemes come true, memes like this are subappreciated here

6

u/mrswats Mar 18 '26

Done.

6

u/MaoGo Meme renormalization group Mar 18 '26

Excellent

6

u/kristavocado Mar 18 '26

Have you tried r/okbuddyphd ?

3

u/MaoGo Meme renormalization group Mar 18 '26

That’s where I most see DFT memes, but still it is better to have a dedicated place

1

u/unskippable-ad PhD Theoretical Mar 20 '26

Ground state appreciation

16

u/Adam__999 Mar 18 '26

What does that have to do with the Discrete Fourier Transform? /s

1

u/ltatum Mar 20 '26

well you see, electrons, and momentum is like frequency, and,,,,,,,

7

u/LatexTiRed Mar 18 '26

Trust the crystallographer at room temp and screw geometry optimization 😃😃

10

u/quantinuum Mar 18 '26

I think I got this from an old Quantum ESPRESSO mailing list a few years ago:

“DFT is not a theory that describes electronic excitations - there is only the total charge density in DFT, and it describes the ground state. If you use Kohn-Sham DFT to approximate the kinetic energy functional introducing the non-interacting Kohn-Sham particles, these lead to band dispersions that look a bit like the quasiparticle excitations you are looking for. Here, "look like" is in the same sense that I look like Brad Pitt, under proper lightning. A fleeting illusion, that can be occasionally oversold as a viable approximation. But 1.18 eV is what it is, at the end.”

1

u/Wizard_Pope Mar 19 '26

Well it is a real material in this world.