spxtr

6 ms·

1.
by spxtr 4mo ago
I thought this was a hilarious comment, for what it's worth.
2.
by spxtr 3y ago
Pretty funny. Having taught low-temperature condensed matter labs, a big part of the grade is figuring out what went wrong, and either correcting for it, or at least acknowledging that it went wrong. The student needed to give more informat
3.
by spxtr 3y ago
ET Jaynes has a book "Probability Theory: The Logic of Science". It's a nice book, and I was wondering if you had any thoughts on it.
4.
by spxtr 3y ago
Do you disagree with ET Jaynes then?
5.
by spxtr 4y ago
They won't, but MoS_2 very well could be.
6.
by spxtr 4y ago
Superconductivity in TBG was originally sold as "unconventional". This article reaffirms that claim by showing how it cannot be a BCS superconductor, and more. Very interesting. It's worth reiterating that while graphene can
7.
by spxtr 4y ago
The other problem with this approach is that it is limited to 50% efficiency long-term. They claim "up to 90%", but it is only 90% efficient immediately after switching directions. The efficiency then drops to 0% before switching
8.
by spxtr 4y ago
Matt Yankowitz' "Tuning superconductivity in magic-angle graphene" shows how hydrostatic pressure affects TBG magic.
9.
by spxtr 4y ago
I was measuring a delicate electronic device at MagLab in Tallahassee. They warned me that the best data would be had at night, because of reduced noise from a nearby radio station. Precisely at 8 PM every night my data became noticably sha
10.
by spxtr 4y ago
Particle physics does not include that. There is no evidence that superconductivity requires any physics outside of the standard model.
11.
by spxtr 4y ago
You can probe different areas of the same device by adding many electrical probes, usually in a geometry called a Hall bar. In the old days of TBG, the different regions of the same device would do wildly different things. These days we are
12.
by spxtr 4y ago
The mechanical tearing imparts the strain. Probably. Nobody really knows that for sure. These days, common practice is to cut the graphene with an AFM or laser prior to stacking.
13.
by spxtr 4y ago
https://www.nature.com/articles/s41586-019-1431-9 https://arxiv.org/abs/1812.08776
14.
by spxtr 4y ago
Lovely article. > Creating a working device typically takes them dozens of tries. And even then, each device behaves differently, so specific experiments are almost impossible to repeat. This is frustrating. You can make two twisted bila
15.
by spxtr 4y ago
The article is from 2016, before she started her YouTube channel.
16.
by spxtr 5y ago
I'm probably misreading this, but I see "In this study, age ≥65 years, immunosuppression, diabetes, and chronic kidney, cardiac, pulmonary, neurologic, and liver disease were associated with higher odds for severe COVID-19 outcome
17.
by spxtr 5y ago
I have comcast internet with my own modem/router. Comcast will not give me a static IP unless I use their rental modem/router, which costs quite a bit monthly. I use ddns to work around this issue, and it mostly works fine.
18.
by spxtr 5y ago
It's sad that a great scientist got caught up in politics here. I suspect that if he had received money from any other country then he would have received a mere slap on the wrist. Of course what he did was mega illegal and he knew it,
19.
by spxtr 5y ago
I felt like this book was incredibly clever, but at times it felt like the pacing was infuriatingly slow. Especially near the start, it feels like there are too many chapters of world building per chapter of story. Still, thoroughly enjoyed
20.
by spxtr 5y ago
> The new particle contains two charm quarks and an up and a down antiquark. Several tetraquarks have been discovered in recent years (including one with two charm quarks and two charm antiquarks), but this is the first one that contains
21.
by spxtr 5y ago
I used to play a real-time version of this called Kung-Fu Chess. Each piece takes time to move to its destination, and when it arrives, a timer ticks down before that specific piece can be moved again. Very fun game. https://en.w
22.
by spxtr 5y ago
I don't understand what you are saying. The parent comment said that quantum allows a few types of operations to get faster, and your response was "No," followed by a specific algorithm that is faster. Where do you disagree?
23.
by spxtr 5y ago
Nice article! Many of the cool excitonic properties that he describes were recently (last 10 years ish) seen in a class of materials known as TMDCs: https://en.wikipedia.org/wiki/Transition_metal_dichalcogenid... Conde
24.
by spxtr 6y ago
I personally think that the Hofstadter butterfly stuff is absolutely gorgeous, and it was a large part of why I started working on 2D materials in the first place. https://en.wikipedia.org/wiki/Hofstadter%27s_butterfly
25.
by spxtr 6y ago
I think CVD graphene (grown, production-scale stuff) has gotten to decent quality these days. There's much more to these devices than graphene, however. You may have noticed that literally every experimental paper on this stuff has Ken
26.
by spxtr 6y ago
Graphene continues to impress condensed matter physics researchers. Just by taking this material made out of carbon atoms you can get superconducting states, correlated insulating states, ferromagnetism, and some others. By using field-effe
27.
by spxtr 6y ago
Momentum is still conserved in quantum mechanics. This breaks the laws of physics regardless of whether or not it needs a constant energy source.
28.
by spxtr 7y ago
Does this name have any significance other than what you said here and what they say in this article?