What Happens to a Particle's Energy When a 1D Box Shrinks?

In summary, when a particle in a 1D box at the lowest energy level is placed in a smaller box, it will remain at the same energy level. However, the energy levels will shift. This phenomenon can be observed in systems like a Josephson junction, where changing the bias current can change the shape and depth of the potential. If the change in shape is done quickly, it may even induce Landau-Zener transitions. This effect can be studied through experiments such as macrosopic quantum tunneling or resonant activation.
  • #1
msumm
19
0
what happens if we have a particle in a 1D box at the lowest energy level, and we shrink the box? i realize that it would need to get go to a higher energy level to continue to satisfy schrodinger's eqn in the smaller box. is that what happens? any links or explanation of the process?

thanks
 
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  • #2
No, the particle stays put. The energy levels shift.

What you are describing happens in e.g. a Josephson junction when you change the bias current (the shape and depth of the junction potential depends on the current); this effect can be seen quite easily macrosopic quantum tunneling (MQT) experiment and/or resonant activation.

Note that this assumes that you are changing the shape adiabatically. If you somehow change the shape very quickly things change and you might even be able to induce Landau-Zener transitions.
 
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  • #3


I can confirm that shrinking the box will indeed cause the particle to shift to a higher energy level. This is due to the uncertainty principle, which states that the more precisely we know the position of a particle, the less we know about its momentum, and vice versa. As the box shrinks, the particle's position becomes more confined, increasing its uncertainty in momentum. To satisfy the Schrodinger equation, the particle must then transition to a higher energy level where its momentum can accommodate the increased uncertainty.

This process is known as quantum confinement and is a common phenomenon in nanotechnology, where particles are confined to small spaces such as nanowires or nanoparticles. Here is a link to an article that explains this process in more detail: https://www.sciencedirect.com/science/article/pii/S1369702113000561

Additionally, this phenomenon has been observed in experiments with atoms confined in optical lattices, providing further evidence for the validity of this concept. I hope this helps to clarify the process.
 

1. What is a "Particle in a shrinking box"?

A "Particle in a shrinking box" is a hypothetical scenario used to teach the principles of quantum mechanics. It involves a particle confined to a box that is gradually shrinking in size, and how the particle's behavior and energy levels change in response to the changing size of the box.

2. How does the size of the box affect the particle's energy levels?

The energy levels of the particle are directly proportional to the size of the box. As the box shrinks, the energy levels increase, and as the box expands, the energy levels decrease. This is because the particle's location and momentum are inversely related, and a smaller box means the particle's possible locations are more restricted, leading to higher energy levels.

3. Can the particle escape from the shrinking box?

No, the particle cannot escape from the shrinking box. The box acts as a potential barrier that the particle cannot pass through. As the box shrinks, the potential barrier becomes higher, making it even more difficult for the particle to escape.

4. How does the uncertainty principle apply to the "Particle in a shrinking box" scenario?

The uncertainty principle states that the more precisely we know a particle's position, the less we know about its momentum, and vice versa. In the "Particle in a shrinking box" scenario, as the box shrinks and the particle's possible positions become more restricted, its momentum becomes less certain.

5. What real-world applications does the "Particle in a shrinking box" concept have?

The concept of a "Particle in a shrinking box" has applications in various fields of science, such as quantum computing and nanotechnology. It also helps to explain the behavior of electrons in atoms and molecules, and how their energy levels change in response to external factors.

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