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Electronic Structure of LK-99

arxiv.org

21–30 of 448 posts

Re: Electronic Structure of LK-99

#21
post #16

The most interesting phenomenon revealed so far is that the room-temperature superconductor people and the generative-LLMs-are-God people draw on the same limited global pool of credulity, such that HN cannot be flooded with both ChatGPT worship and superconductor speculation at the same time.

[deleted]

Re: Electronic Structure of LK-99

#22
post #19
post #16

The most interesting phenomenon revealed so far is that the room-temperature superconductor people and the generative-LLMs-are-God people draw on the same limited global pool of credulity, such that HN cannot be flooded with both ChatGPT worship and superconductor speculation at the same time.

the singularity isn't going to implement itself, you know.

not with that attitude it isn’t

Re: Electronic Structure of LK-99

#23

I got my PhD studying band structure of high-tc superconductors (experimentalist, ARPES). These Cu d-d interactions right at the fermi energy give me huge hope. Feels very familiar to other superconductors (re: all the cuprates). (Note: I specifically worked in a lab that was measuring a lot of the d-wave character / gap-energies of various superconductors) All in all, I'm now much more bullish on LK-99 being real su…

Thanks for your input.

What would you need to see to say "I am 100% convinced this is / isn't real"?

And how long would you expect it will be before that occurs?

Re: Electronic Structure of LK-99

#24
post #16

The most interesting phenomenon revealed so far is that the room-temperature superconductor people and the generative-LLMs-are-God people draw on the same limited global pool of credulity, such that HN cannot be flooded with both ChatGPT worship and superconductor speculation at the same time.

Given that I only have to go down to the eighth item on the front page to get to a story about LLMs (past three stories about superconductors) are you so sure about that?

Re: Electronic Structure of LK-99

#25

So theorically they agree with LK-99 reaching superconductivity?

I am a PhD student in Physics, but I am no expert in condensed matter physics (I do research in computational NMR). Based on my experience with theorists and simulation researcher, I am a bit concerned with anchoring bias and the speed at which simulation papers are being published here. Then again, I don't know exactly what kind of research steps they follow to do their research.

There’s an old saying that “simulations are bound to succeed,” but also as an academic that has a working knowledge of statistical mechanics but is not a (condensed matter) physicist, from what I’ve read it seems folks are approaching this with healthy skepticism likely due to the drama around the development and release of the first paper.

The simulation paper folks are talking about used what appeared to be an existing DFT simulation package. Now, DFT is an approximate theory used to render computation tractable, but to my understanding it is a popular and mature method. I was actually kind of impressed that they were able to reproduce results from the LK paper in simulation so quickly. While it’s possible the speed led to a bug or error in the analysis, simulations often don’t just magically work and can take a decent amount of parameter tuning — especially if the system being simulated has something tricky or exotic going on. The fact that they were able to get what appears to be an accurate simulation working quickly that also justifies the low yield rates has made me more cautiously optimistic than anything

Re: Electronic Structure of LK-99

#26

This ongoing research saga pretty much the most excited I’ve been about anything since before Covid. It feels like the science equivalent of watching your favorite sports team on an epic rise towards winning a world championship. Even if this turns out to flop, I hope history remembers the original authors favorably. They really did find something that by all accounts could plausibly be a room temp superconductor. An…

Just curious, how did you find Covid "exciting"? Making lots of money on the bear market?

Re: Electronic Structure of LK-99

#27
post #23

I got my PhD studying band structure of high-tc superconductors (experimentalist, ARPES). These Cu d-d interactions right at the fermi energy give me huge hope. Feels very familiar to other superconductors (re: all the cuprates). (Note: I specifically worked in a lab that was measuring a lot of the d-wave character / gap-energies of various superconductors) All in all, I'm now much more bullish on LK-99 being real su…

Thanks for your input. What would you need to see to say "I am 100% convinced this is / isn't real"? And how long would you expect it will be before that occurs?

I'm not a scientist, but personally I expect I'll have two "wow, this is really happening" moments:

(1) When there's peer-reviewed replication from a group of reputable labs.

(2) When I see the classic superconductor-on-magnetic-track demo, but without liquid nitrogen.

Re: Electronic Structure of LK-99

#28
post #10

So theorically they agree with LK-99 reaching superconductivity?

yes, but if you reported 100 different substances reaching superconductivity, 100 theorists will publish papers demonstrating their model supports the observation... regardless of whether those substances actually reach superconductivity. (put another way: it's post-hoc)

Sure it’s post hoc, but these are ab initio calculations, there’s not all that much wiggle room that you could make anything you like come out looking like a superconductor. Plus now I’ve seen three calculations with three different functionals and reasonable convergence criteria and they all find similar electronic structure

Re: Electronic Structure of LK-99

#29

I got my PhD studying band structure of high-tc superconductors (experimentalist, ARPES). These Cu d-d interactions right at the fermi energy give me huge hope. Feels very familiar to other superconductors (re: all the cuprates). (Note: I specifically worked in a lab that was measuring a lot of the d-wave character / gap-energies of various superconductors) All in all, I'm now much more bullish on LK-99 being real su…

So happy to hear this. I've been hoping for some sort of breakthrough ever since I first encountered footage of magnets falling through Cu tubes at an extremely leisurely pace.

Any conductive material for the tube will have a similar effect. It isn't specific to copper.

The moving magnet induces a current in the tube which in turn creates the magnetic field that interacts with the magnet.

Re: Electronic Structure of LK-99

#30
My understanding is that the "99" in LK-99 is the year it they first synthesized the material, i.e. 1999.

Assuming this is all true, why is it just now coming to light? Did they just not know what they had? (I have not been following this closely, maybe this has already been explained)

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