On the Metal-Insulator Transition in a Two-Dimensional Hubbard Model
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概要
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Antif'erromagnetic and metal to insulator transitions in the ground state of a two dimensionalhalf-filled Hubbard model with the nearest neighbor and the second nearest neighbor transfers( -t and t', respectively) are sttrdied by using the Hartree-Fock approximation. The resultsindicate that the phase diagram depends on the band structtrre or t'/t ratio; a discontinuoustransition between the paramagnetic metallic (PM) and the antiferromagnetic insulator (Al)phases takes place for t'/t : 0.2, while continuous transitions from PM to AM (antiferrornagneticmetal) and then to Al phases take place for t'/t : 0.5. The results are compared with thoseof the Gutzwiller approximation and discussed in the light of the other existing theories. Thegeneral importance of' considering antiferromagnetism in this problem is emphasized.
- 社団法人日本物理学会の論文
- 1996-08-15
著者
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Moriya Toru
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Kondo Hisashi
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Moriya Toru
Deparment Of Physics Wasea University
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