Soliton Lattice Modulation of Incommensurate Spin Density Wave in Two Dimensional Hubbard Model : A Mean Field Study
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概要
- 論文の詳細を見る
Spatially modulated magnetic phases are investigated within the mean field theoryfor an itinerant electron model, i.e. the Hubbard model on a two-dimensional squarelattice. By numerically diagonalizing the Hamiltonian for finite-size systems under aperiodic boundary condition, we examine relative stability and physical properties ofseveral possible magnetic states. When the electron fillings are nearly half-full, thediagonally or vertically modulated spin density wa.ve (SDW) state is stabilized overthe uniform antiferromagnetic state and a crossover from the vertical to the diagonalstates appears. The diagonal or vertical stripe state is characterized by the presence ofthe midgap band due to the soliton lattice formation inside the main SDW gap, beingan insulator. The wave length 2... is linearly proportional to the excess carrier con-centration. Excess carriers are accommodated in the form of the soliton lattice, form-ing a charge density wave whose wave length is 2..,./2.
- 社団法人日本物理学会の論文
- 1990-03-15
著者
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Machida K
Okayama Univ. Okayama
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Kato Masaru
Department Of Analytical Chemistry School Of Pharmaceutical Sciences University Of Shizuoka
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Machida Kazushige
Department Of Physics Kyoto University
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FUJITA Mitsutaka
Institute of Materials Science,University of Tsukuba
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Machida K
Department Of Physics Okayama University
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Nakanishi Hiizu
Institute For Theoretical Physics University Of California
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KATO Masary
Department of Mathmatical Sciences,College of Engineering,University of Osaka
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Kato Masary
Department Of Mathmatical Sciences College Of Engineering University Of Osaka
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Fujita Mitsutaka
Institute Of Materials Science And Center For- Tsukuba Advanced Research Alliance (tara) University
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