Abstract
We prove that the ground state of a system of fermions is orthogonal to the ground state in the presence of a finite range scattering potential, as . This implies that the response to application of such a potential involves only emission of excitations into the continuum, and that certain processes in Fermi gases may be blocked by orthogonality in a low-, low-energy limit.
- Received 27 March 1967
DOI:https://doi.org/10.1103/PhysRevLett.18.1049
©1967 American Physical Society