Trotzky, S. [P:(DE-HGF)0] ; Chen, Y-A. [P:(DE-HGF)0] ; Flesch, A. [P:(DE-Juel1)139006] ; McCulloch, I. P. [P:(DE-HGF)0] ; Schollwöck, U. [P:(DE-HGF)0] ; Eisert, J. [P:(DE-HGF)0] ; Bloch, I. [P:(DE-HGF)0]