30 citations · 180 across the 23 of their papers we have counts for
23 papers
Matrix product states for invariant quantum spin chains
Rubina Zadourian, Andreas Fledderjohann, Andreas Klümper
A systematic and compact treatment of arbitrary invariant spin- quantum chains with nearest-neighbour interactions is presented. The ground-state is derived in terms of…
Diagrammatics for SU(2) invariant matrix product states
Andreas Fledderjohann, Andreas Klümper, Karl-Heinz Mütter
We report on a systematic implementation of su(2) invariance for matrix product states (MPS) with concrete computations cast in a diagrammatic language. As an application we presen…
Deconfinement phase transition in a two-dimensional model of interacting plaquettes
A. Fledderjohann, A. Klümper, K. H. Mütter
A two-dimensional model of interacting plaquettes is studied by means of the real space renormalization group approach. Interactions between the plaquettes are mediated solely by s…
Real space renormalization group approach to the 2d antiferromagnetic Heisenberg model
A. Fledderjohann, A. Klümper, K. H. Mütter
The low energy behaviour of the 2d antiferromagnetic Heisenberg model is studied in the sector with total spins by means of a renormalization group procedure, which gener…
Formation of clusters in the two dimensional t-J model: The mechanism for phase separation
A. Fledderjohann, A. Langari, K. -H. Muetter
The emergence of phase separation is investigated in the framework of a 2D t-J model by means of a variational product ansatz, which covers the infinite lattice by two types of L x…
Ferromagnetism in a hard-core boson model
A. Fledderjohann, A. Langari, E. Mueller-Hartmann +1
The problem of ferromagnetism -- associated with a ground state with maximal total spin -- is discussed in the framework of a hard-core model, which forbids the occupancy at each s…