Fortschritte der Physik

Cover image for Vol. 65 Issue 6-8

Editor: Dieter Lüst, Wolfgang Schleich (Co-Editor)

Impact Factor: 2.434

ISI Journal Citation Reports © Ranking: 2016: 16/79 (Physics Multidisciplinary)

Online ISSN: 1521-3978

Associated Title(s): Annalen der Physik

57_5-7/2009Cover Picture: Fortschritte der Physik 5–7 / 2009

The cover page of 2009 shows high-resolution interference “quantum carpet” patterns for the momentum wave function of an interacting Bose-Einstein condensate (BEC). As time progresses (from back to front), the many-body mean field interaction of the BEC first leads to a broadening of the wave function, but then also to a time-varying interference structure by inducing site-dependent nonlinear phase shifts when the BEC is confined in a spatially periodic potential. Imaging the wave function in momentum space for different times leads to a pattern that one reminds of a carefully woven carpet and is hence termed “quantum carpet”. Quantum carpets beautifully demonstrate the surprisingly high matter wave coherence of particle-particle interactions in the zero-temperature limit.

| Table of Contents