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原子力機構・兵県大合同物性コロキウム(第71回)

日時: 平成22年8月18日(水) 16:00〜
Date and time: 18th Aug. (Wed.) 16:00〜
場所: 兵庫県立大学理学部 研究棟7階談話室(739号室)
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
講演者: 宮崎真長 氏(函館高専)
Speaker: Prof. Mitake Miyazaki (Hakodate National College of Technology)
Abstract:

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.[1] 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'|.

[1] M. Miyazaki, K. Yamaji, T. Yanagisawa and R. Kadono, J. Phys. Soc. Jpn. 78 (2009) 043706.