Content
Signatures of Anderson Orthogonality in quantum quenches
Wolfgang Münder
17.11.2010 at 16:00
Abstract:
Since the late 1960’s it is known that the response of a Fermi sea to changes in a local scattering potential results in a change of the scattering phase shifts of all the single-particle wave functions, which is known as Anderson Orthogonality. This causes the ground states of the system before and after the change to be orthogonal in the thermodynamic limit. Moreover, it is also known that Anderson Orthogonality also influences dynamical properties of the system like optical absorption spectra, which has been shown analytically at that time for the X-Ray edge effect. In recent work this has been extended to the context of the Kondo exciton. In this work, we establish a formalism to study signatures of the Anderson Orthogonality in quantum quenches in the general case of a switch between an initial Hamiltonian and a final Hamiltonian. Based on this, we study the Anderson Orthogonality for a series of models of increasing complexity within the framework of the numerical renormalization group, NRG.
Room A 450, Theresienstr. 37 , LMU