Bose-Einstein condensate diagram

  • I
  • Thread starter Jufa
  • Start date
  • #1
29
5

Summary:

Struggling with Bose-Einstein condensates diagram.

Main Question or Discussion Point

I have seen many of these diagrams in internet and I fail to figure out what their actual meaning is. Can someone explain what the axes and different colours mean? Also, which is the physical interpretation that can be extracted from them? Thanks in advance :).
miguel_bose.png
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
2019 Award
13,341
3,153
many of these diagrams
You could add a reference !

You know what BE condensation means ?

Picture shows particle velocities. Color is density: number of particles with vx, vy in a cell. When it gets colder number of particles with vx=vy=0 increases: they all tend occupy the same QM ground state
 
  • #3
DrClaude
Mentor
7,337
3,516
The original data looks like
bec1_fig2.jpg

Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor
M. H. Anderson, J. R. Ensher, M. R. Matthews, C. E. Wieman, E. A. Cornell
Science, v. 269, no. 5221 (1995), p. 198-201

These are false color images of the velocity distribution of the atoms in the clouds. The image you posted is the same data, but with an added height that is the same as the color map (in other words, color and height represent the same thing, namely the density of atoms with a given velocity).
 
  • Like
Likes BvU and vanhees71
  • #4
DrClaude
Mentor
7,337
3,516
Note that because Bose-Einstein in achieved here in a trap, the condensation happens not only in momentum space, but also in ordinary space. This is why the figure in the OP cheats a bit by presenting a spatial scale for what should be only velocities.
 
  • Like
Likes vanhees71
  • #5
29
5
You could add a reference !

You know what BE condensation means ?

Picture shows particle velocities. Color is density: number of particles with vx, vy in a cell. When it gets colder number of particles with vx=vy=0 increases: they all tend occupy the same QM ground state
If colour stands for the density, what is the height?
 
  • #6
BvU
Science Advisor
Homework Helper
2019 Award
13,341
3,153
color = height
 
  • #7
DrClaude
Mentor
7,337
3,516
If colour stands for the density, what is the height?
(in other words, color and height represent the same thing, namely the density of atoms with a given velocity).
 
  • #8
29
5
Perfect, thanks! I do fully understand the diagram now.
 

Related Threads on Bose-Einstein condensate diagram

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
10
Views
5K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
3
Views
929
  • Last Post
Replies
11
Views
5K
  • Last Post
Replies
2
Views
656
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
1
Views
3K
Replies
1
Views
2K
Top