Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique
TT 16.83: Poster
Samstag, 5. März 2005, 11:00–16:30, Poster TU C
Checkerboard Order in the projected SO(5) model — •Martin Jöstingmeier1, Stephan Hochkeppel1, Werner Hanke1, and Shou-Cheng Zang2 — 1Theoretische Physik, Am Hubland, D-97074 Würzburg, Germany — 2Department of Physics, Stanford University, Stanford, 94305 California
Based on Contractor renormalization group calculations, it was recently proposed
[1] to extend the projected SO(5) model by offsite Coulomb repulsions. We study this model, using numerically essentially exact Quantum-Monte Carlo calculations, in order to clarify the (T=0) phase diagram. We find antiferromagnetism, superconductivity as well different types of charge-ordered phases. In particular, we determine the type of the phase transition at a multicritical point, that is a possible candidate for SO(5) symmetry restoration. Motivated by scanning tunneling microscopy experiments on Bi2Sr2CaCu2O8+δ and Ca2−xNaxCuO2Cl2
[2,3,4] , that observe charge ordering patterns, we also study in detail checkerboard order as function of doping as well as temperature.
[1] H.-D. Chen, S. Capponi, F. Alet, and S.-C. Zhang, Phys. Rev. B (2004).
[2] J. E. Hoffman, E. W. Hudson, K. M. Lang, V. Madhavan, H. Eisaki, S. Uchida, and J. C. Davis, Science 295, 466 (2002).
[3] C. Howald, H. Eisaki, N. Kaneko, M. Greven, and A. Kapitulnik, Phys. Rev. B 67, 014533 (2003).
[4] M. Vershinin, S. Misra, S. Ono, Y. Abe, Y. Ando, and A. Yazdani, Science 303, 1995 (2004).