Degeneracy — may refer to: Degeneration In science and mathematics: Degeneracy (statistical mechanics), a property of quantum states sharing the same energy levels Degeneracy (mathematics), a limiting case in which a class of object changes its nature so as… … Wikipedia
Quantum harmonic oscillator — The quantum harmonic oscillator is the quantum mechanical analogue of the classical harmonic oscillator. It is one of the most important model systems in quantum mechanics because an arbitrary potential can be approximated as a harmonic potential … Wikipedia
Old quantum theory — Quantum mechanics Uncertainty principle … Wikipedia
Degeneracy (mathematics) — For the degeneracy of a graph, see degeneracy (graph theory). This article is about degeneracy in mathematics. For other uses, see Degeneracy. In mathematics, a degenerate case is a limiting case in which a class of object changes its nature so… … Wikipedia
Quantum point contact — A Quantum Point Contact (QPC) is a narrow constriction between two wide electrically conducting regions, of a width comparable to the electronic wavelength (nano to micrometer). Quantum point contacts were first reported in 1988 by a Dutch group… … Wikipedia
Quantum stirring, ratchets, and pumping — A pump is an AC driven device that generates a DC current. In the simplest configuration a pump has two leads connected to two reservoirs. In such open geometry the pump takes particles from one reservoir and emits them into the other.… … Wikipedia
degeneracy — /di jen euhr euh see/, n. 1. degenerate state or character. 2. the process of degenerating; decline. 3. degenerate behavior, esp. behavior considered sexually deviant. 4. Physics. the number of distinct quantum states of a system that have a… … Universalium
Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a … Wikipedia
Hamiltonian (quantum mechanics) — In quantum mechanics, the Hamiltonian H is the observable corresponding to the total energy of the system. As with all observables, the spectrum of the Hamiltonian is the set of possible outcomes when one measures the total energy of a system.… … Wikipedia
Electron degeneracy pressure — is a consequence of the Pauli exclusion principle, which states that two fermions cannot occupy the same quantum state at the same time. The force provided by this pressure sets a limit on how much matter can be squeezed together without it… … Wikipedia