Instability toward Formation of Quasi-One-Dimensional Fermi Surface in Two-Dimensional t-J Model : Condensed Matter: Electronic Properties, etc.

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概要

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• We show within the slave-boson mean field approximation that the two-dimensional t-J model has an intrinsic instability toward forming a quasi-one-dimensional (q-1d) Fermi surface. This q-1d state competes with, and is overcome by, the d-wave pairing state for a realistic parameter choice. However, we find that a small spatial anisotropy in t and J exposes the q-1d instability which has been hidden behind the d-wave pairing state, and brings about the coexistence with the d-wave pairing. We argue that this coexistence can be realized in La_<2-x>Sr_xCuO_4 systems.

• 社団法人日本物理学会の論文
• 2000-07-15

著者

• Kohno Hiroshi

  Graduate School Of Engineering Science Osaka University

• Yamase Hiroyuki

  Institute For Solid State Physics University Of Tokyo

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• Possible Quasi-One-Dimensional Fermi Surface in La_Sr_xCuO_4 : Condensed Matter: Electronic Properties, etc.
• Instability toward Formation of Quasi-One-Dimensional Fermi Surface in Two-Dimensional t-J Model : Condensed Matter: Electronic Properties, etc.
• Magnetic Excitation of t–J Model with Quasi-One-Dimensional Fermi Surface — Possible Relevance to LSCO Systems

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