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MA: Fachverband Magnetismus

MA 16: Bio- and Molecular magnetism

MA 16.11: Talk

Tuesday, March 17, 2015, 12:15–12:30, EB 202

Investigation of hexagonal spin tubes using DMRG — •Michael Czopnik and Jürgen Schnack — University of Bielefeld, Germany

The Density Matrix Renormalization Group (DMRG) is one of the most powerful numerical techniques for studying many-body systems. It was developed to overcome the problems arising in the application of the Numerical Renormalization Group (NRG) to quantum lattice many- body systems such as the Hubbard model of strongly correlated electrons.

The physics of spin tubes has attracted much attention in recent years. A so-called "spin tube" is a spin ladder with periodic boundary condition in the rung direction. It has a geometrical frustration in case the number of legs is odd and the frustration induces a variety of interesting phenomena.

We study the ground state and the magnetization of a Heisenberg spin tube made of nickel spins, using Den- sity Matrix Renormalization Group technique (DMRG) and exact diagonalization.

Special emphasis is put on unusual features of the magnetization curve, such as extended plateaus or jumps.