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|Date and time:||18th Aug. (Wed.) 16:00〜|
|Place:||Lecture room 739, 7F, Faculty of Science, University of Hyogo|
|Title:||Effect of long-range transfer on superconductivity and incommensurate antiferromagnetism in two-dimensional Hubbard model|
|Speaker:||Prof. Mitake Miyazaki (Hakodate National College of Technology)|
By using a variational Monte Carlo method, we discuss the ground state of the under-doped region on a two-dimensional t-t'-t''-U Hubbard model (t, t' and t'' are the first-, second- and third-neighbor transfer energies, respectively).
The t'- and t''- dependence of the condensation energies of inhomogeneous magnetic and charge-ordered states was investigated.
As t' increases with a fixed relation t''=-t'/2, the stable spin texture changes from a striped structure to a checkerboarded structure.
We also show that the d-wave superconducting state coexisting with the striped spin structure is the most stable state among other ordered states for small |t'|.
 M. Miyazaki, K. Yamaji, T. Yanagisawa and R. Kadono, J. Phys. Soc. Jpn. 78 (2009) 043706.