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TT: Fachverband Tiefe Temperaturen

TT 24: Correlated Electrons: Low-dimensional Systems - Models

TT 24.13: Talk

Wednesday, February 27, 2008, 17:30–17:45, H 2053

Doped ladders under magnetic field — •Guillaume Roux¹, Edmond Orignac², Steven R. White³, and Didier Poilblanc⁴ — ¹Institut für theoretische Physik C, RWTH Aachen, Aachen, Germany — ²Laboratoire de Physique de l’École Normale Supérieure de Lyon, ENS-Lyon, CNRS UMR5672, Lyon, France — ³Department of Physics and Astronomy, University of California, Irvine, USA — ⁴Laboratoire de Physique Théorique, IRSAMC, Université Paul Sabatier, CNRS UMR5152, Toulouse, France

We study the effect of the magnetic field on doped two-leg ladders by means of density-matrix renormalization group (DMRG) and bosonization techniques. It is shown that the Zeeman effect induces a magnetization plateau controlled by hole doping and a FFLO phase. This latest is associated with an exceeding of Pauli limit which can help with the interpretation of experiments. Furthermore, superconducting non-polarized triplet fluctuations are also found to emerge at high magnetic field. In addition, the orbital effect is included and the transverse current correlations are shown to be commensurate with the charge density ones as soon as the magnetic field is turn on. Lastly, the diamagnetic susceptibility probes the commensurate phases appearing for commensurate dopings.