I just couldn't come up with the correct English word for it fast :D In the Netherlands we call them 'toppen' (that's why I wrote tops) or 'buiken' (which literally means bellies). Of course the word maxima is used too, but not quite often. Perhaps it has something to do with the (crown)prinses from Argentina whose name is Maxima... 
A potential well is a region in space where a particle is confined by a potential energy barrier. This means that the particle has a higher potential energy inside the well compared to outside, making it more likely to remain within the well.
A potential well is created by applying an external potential energy to a particle. This can be done using electric or magnetic fields, or by creating a physical barrier. The shape and depth of the well depends on the strength of the potential energy applied.
Particles in a potential well can either be bound within the well or have enough energy to escape. Bound particles oscillate back and forth within the well, while particles with enough energy will eventually leave the well. The behavior of particles in a potential well is governed by the laws of quantum mechanics.
Potential wells have various applications in physics, chemistry, and engineering. They are used in particle accelerators, quantum computing, and in the study of atomic and molecular interactions. They are also important in designing efficient electronic devices such as transistors and diodes.
Yes, potential wells can be manipulated and controlled using various methods. This includes changing the strength or shape of the potential energy barrier, applying external forces, or using quantum mechanical techniques to alter the behavior of particles within the well. This ability to control potential wells is crucial in many technological applications.