Group News (2017)1 January 2018|ILP SengstockSymmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atomsPhoto: AG SengstockWe study several effects which lead to symmetry-broken momentum distributions of quantum gases released from optical lattices. In particular, we...8 September 2017|ilp SengstockCharacterizing topology by dynamics: Chern number from linking numberPhoto: AG SengstockTopology plays an important role in modern solid state physics describing intriguing quantum states such as topological insulators. It is an...6 July 2017|ILP SengstockTime-reversal symmetry breaking in 1D superfluidsPhoto: AG SengstockWe found a superfluid which spontaneously breaks the time-reversal symmetry in one-dimensional optical lattices. This twisted superfluid is...8 March 2017|ilp SengstockObservation of topological Bloch-state defects and their merging transitionPhoto: AG SengstockTopological defects in Bloch bands, such as Dirac points in graphene, and their resulting Berry phases play an important role for the electronic...