Rotating Bose-Einstein Condensate

Superfluids are distinguished from normal fluids by their peculiar response to rotation: circulating flow in superfluid helium, a strongly coupled Bose liquid, can appear only as quantized vortices. The newly created Bose-Einstein condensates - clouds of millions of ultracold, weakly interacting alkali-metal atoms that occupy a single quantum state - offer the possibility of investigating superfluidity in the weak-coupling regime. An outstanding question is whether Bose-Einstein condensates exhibit a mesoscopic quantum analogue of the macroscopic vortices in superfluids, and what its experimental signature would be. Here we report calculations of the low-energy states of a rotating, weakly interacting Bose gas. We find a succession of transitions between stable vortex patterns of differing symmetries that are in general qualitative agreement with observations of rotating superfluid helium, a strong-coupling superfluid. Counterintuitively, the angular momentum per particle is not quantized. Some angular momenta are forbidden, corresponding to asymmetrical unstable states that provide a physical mechanism for the entry of vorticity into the condensate.

Category:

Science & Technology

Tags:

• Rotating
• Bose
• Einstein
• condensate

[krebscycler]

Is this how they make donuts?

[AlienScientist]

Superfluids are BECs neomaster911. They have zero viscosity, no resistance!

[cuervotaylor]

@xOxyG3N Donuts

[JosephFiero]

@KoreaRwkz Opps, my apology, you are correct.

[KoreaRwkz]

@JosephFiero I don't think you can chill anything to complete zero even today. Very close to zero but not exactly zero.

[JosephFiero]

@xOxyG3N lol, youtube is so weird with videos. This video is about taking elements of the world and freezing them to the point where you can't freeze anything anymore, all the way to ZERO. When you apply pressure and cold to the gas "helium" the ones that lift of the balloons, you get liquid. Now if you freeze this liquid as cold as possible, the atoms that make up the element change into some kind of different energy or state. They go from looking like little balls to like spaghetti.

[JosephFiero]

@sweetduster Thanks for the reply and information! 

[xOxyG3N]

@JosephFiero i dont even know what the video was about

[sweetduster]

@JosephFiero These are all good questions, and while I can't answer all of them, I can tell you this much; strings all have fixed lengths, and depending on the type (there are 3), the string will adhere to certain laws of physics (for example closed strings have inter-dimentional properties while open ended ones are bound to our 3-D membrane.) The actual vibrations are reliant on the following factors: Is the string closed, single ended, or double ended, and ofcourse what matter it is making up.

[JosephFiero]

@qweqpo4224 Unless there are missing variables in this representation or I do not completely understand it, that behavoir could have something to do with the particles on top of each other and centrifugal force, I'm pretty sure there is something missing here, I find it very interesting on how, mathematically, a 2D/3D simulation can represent a quantium event. Maybe this thing is picking up different "versions" of gravity which are dependant on the object or "matrix" that is pulling on this.

[qweqpo4224]

@JosephFiero it could be, but it's behaving like an outside force like maybe wind currents are affecting the movement and shape of the condensate

[JosephFiero]

@academicroach I believe this is only with Helium in regard to the "Anti-gravity" part. The atoms in solid"ish" "non -wormy ""piled on top of each other" in a" non-conformed" way still causes the liquid to pass the containers solid state... please correct me if I am wrong. thanks