Identical bosons vs. fermions in square potential well

Click For Summary
SUMMARY

This discussion clarifies the behavior of identical bosons and fermions in a square potential well, specifically referencing the probability density functions illustrated on the Wolfram Demonstrations Project. It establishes that while fermions require antisymmetrization of states to achieve the ground state, bosons can occupy the same state, resulting in a single probability density peak when both are in the ground state (n=1). The confusion arises from the visual representation of these states, which may suggest a rotation rather than a distinct difference in behavior.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly wave functions.
  • Familiarity with the concepts of bosons and fermions.
  • Knowledge of potential wells in quantum physics.
  • Basic grasp of antisymmetrization in quantum states.
NEXT STEPS
  • Explore the implications of antisymmetrization in quantum mechanics.
  • Study the properties of bosons and fermions in greater detail.
  • Investigate the mathematical formulation of wave functions in potential wells.
  • Learn about the applications of the Pauli exclusion principle in fermionic systems.
USEFUL FOR

Students and professionals in physics, particularly those focusing on quantum mechanics, as well as educators seeking to explain the differences between bosons and fermions in a pedagogical context.

bobshae
Messages
2
Reaction score
0
The following Wolfram web page shows the probability density functions for two identical bosons in a square potential well. It also shows the probability density for two identical fermions.

http://demonstrations.wolfram.com/WaveFunctionsOfIdenticalParticles/

So it appears that each is just a 90 degree rotation of the other. That doesn't seem correct. If Bosons can share the same state, shouldn't their lowest state just be a single blob in the middle (per the ground state for a single particle)? I know that quantum mechanics is very non-intuitive, so I'm probably missing something. Please help to explain this. Thank you.

--Bob
 
Physics news on Phys.org
The sliders at the top tell you the individual states. The starting point is one particle in the ground state (n=1) and one in the first excited state (n=2). For fermions, antisymmetrizing these does give the ground state, but for bosons, you would need n=1 for both, which would give a single blob in the middle.
 
Avodyne said:
The sliders at the top tell you the individual states. The starting point is one particle in the ground state (n=1) and one in the first excited state (n=2). For fermions, antisymmetrizing these does give the ground state, but for bosons, you would need n=1 for both, which would give a single blob in the middle.

Ah I see. Thank you.
 

Similar threads

  • · Replies 14 ·
Replies
14
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
16
Views
3K
Replies
6
Views
3K
  • · Replies 2 ·
Replies
2
Views
10K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
4
Views
4K
  • · Replies 9 ·
Replies
9
Views
6K
  • · Replies 0 ·
Replies
0
Views
4K