Physik

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Wikipedia: "Die Physik [...] ist eine Naturwissenschaft, die grundlegende Phänomene der Natur untersucht. Um deren Eigenschaften und Verhalten anhand von quantitativen Modellen und Gesetzmäßigkeiten zu erklären, befasst sie sich insbesondere mit Materie und Energie und deren Wechselwirkungen in Raum und Zeit."

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Das Banner zeigt DELPHI in CERN, aufgenommen 2014 von Bonny und steht unter der Lizenz CC BY-NC-SA 2.0.
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marv99

Physicists Find Particle That Only Has Mass When Moving in One Direction (www.sciencealert.com)

submitted 2 days ago* (last edited 2 days ago) by marv99 to c/physik

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tl;dr by ChatGPT:

Scientists have discovered a quasiparticle, the semi-Dirac fermion, which behaves unusually by having mass in one direction but being massless in another. Found in a ZrSiS crystal at extremely low temperatures, this particle challenges conventional physics. Researchers used magneto-optical spectroscopy and strong magnetic fields to observe it. The discovery opens new possibilities in quantum physics and electronics, though many questions remain unanswered.

Deutsch:

Wissenschaftler haben ein Quasiteilchen, das semi-Dirac-Fermion, entdeckt, das in eine Richtung masselos ist, in die andere jedoch Masse hat. Es wurde in einem ZrSiS-Kristall bei extrem niedrigen Temperaturen gefunden. Mithilfe von Magneto-Optischer Spektroskopie und starken Magnetfeldern konnte dieses ungewöhnliche Verhalten beobachtet werden. Die Entdeckung eröffnet neue Möglichkeiten in der Quantenphysik, wirft aber noch viele Fragen auf.

Paper: Semi-Dirac Fermions in a Topological Metal | PDF

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[–] sxan@midwest.social 11 points 2 days ago (2 children)

I do not understand this, so I'll joke:

We should find out which direction is the common "massfull" direction, and call that "Universal Up."

[–] peto@lemm.ee 5 points 2 days ago

Unfortunately I think the directions are only local to the crystal lattice. And being a quasiparticle it is confined to the crystal.

On the up side, you could probably consider this to be an actual magic crystal with special properties, so there is that.

[–] Mastema@infosec.pub 6 points 2 days ago* (last edited 2 days ago) (1 children)

Regrettably, most of my mass is in a direction I would have to call, "down"...

(I don't understand it either, so I'll be self-deprecating!)

[–] sxan@midwest.social 2 points 2 days ago

I was thinking about resistance, and energy required to lift things. But that works, too. I think "backwards" is also a good choice.

I'm studiously ignoring the reply that informed me that the direction is local, not universal, because that's boring.

[–] henfredemars@infosec.pub 2 points 2 days ago

Interesting, but I do think it's important to note for the layperson that these aren't real particles, no? They are groups that appear to change their emergent group property. That's not the same as saying a particle is actually massless in one direction through a crystal lattice.