NullfeldZustand
NullfeldZustand is a term used in physics, primarily in German-speaking literature, to denote the quantum state of a system when external fields are absent or negligibly small. It functions as a reference or baseline condition in which the Hamiltonian reduces to its zero-field form. The concept appears in areas such as condensed matter physics, quantum optics, and spintronics, where distinguishing field-free states from field-dressed ones clarifies theoretical and experimental analyses.
For a system described by a field-free Hamiltonian H0, a NullfeldZustand |ψ> is an eigenstate of H0
Typical examples include a spin-1/2 particle in the absence of a magnetic field, electrons in a quantum
See also: zero field, ground state, field-free Hamiltonian, reference state. Notes: The term is not universally