Gapless Excitation above a Domain Wall Ground State in a Flat-Band Hubbard Model
作者： Makoto Homma , Chigak Itoi
DOI: 10.1007/S10955-004-2723-4
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摘要: We construct a set of exact ground states with localized ferromagnetic domain wall and an extended spiral structure in deformed flat-band Hubbard model arbitrary dimensions. show the uniqueness state for half-filled lowest band fixed magnetization subspace. The these structures are degenerate all-spin-up or all-spin-down under open boundary condition. represent spin one-point function terms local electron number density, find our model. existence gapless excitations above dimensions higher than one. On other hand, periodic condition, is state. that spin-wave excitation -down has energy gap because anisotropy
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Taku Matsui, On the Spectra of the Kink for Ferromagnetic XXZ Models Letters in Mathematical Physics. ,vol. 42, pp. 229- 239 ,(1997) , 10.1023/A:1007396827804
R. F. Werner, C. T. Gottstein, Ground states of the infinite q-deformed Heisenberg ferromagnet arXiv: Condensed Matter. ,(1995)
A Mielke, Exact ground states for the Hubbard model on the Kagome lattice Journal of Physics A. ,vol. 25, pp. 4335- 4345 ,(1992) , 10.1088/0305-4470/25/16/011
Andreas Mielke, Ferromagnetism in the Hubbard model and Hund's rule Physics Letters A. ,vol. 174, pp. 443- 448 ,(1993) , 10.1016/0375-9601(93)90207-G
Nilanjana Datta, Tom Kennedy, Instability of interfaces in the antiferromagnetic XXZ chain at zero temperature Communications in Mathematical Physics. ,vol. 236, pp. 477- 511 ,(2003) , 10.1007/S00220-003-0826-4
Ky-Thuan Bach, Nicolas Macris, On kink states of ferromagnetic chains Physica A-statistical Mechanics and Its Applications. ,vol. 279, pp. 386- 397 ,(2000) , 10.1016/S0378-4371(99)00532-4
Shinya Nishino, Masaki Goda, Koichi Kusakabe, Flat Bands of a Tight-Binding Electronic System with Hexagonal Structure Journal of the Physical Society of Japan. ,vol. 72, pp. 2015- 2023 ,(2003) , 10.1143/JPSJ.72.2015
Oscar Bolina, Pierluigi Contucci, Bruno Nachtergaele, Shannon Starr, Finite-volume excitations of the 111 interface in the quantum XXZ model Communications in Mathematical Physics. ,vol. 212, pp. 63- 91 ,(2000) , 10.1007/S002200000192
Akinori Tanaka, Hiromitsu Ueda, Stability of Ferromagnetism in the Hubbard Model on the Kagome Lattice Physical Review Letters. ,vol. 90, pp. 067204- ,(2003) , 10.1103/PHYSREVLETT.90.067204
Hal Tasaki, Ferromagnetism in the Hubbard models with degenerate single-electron ground states. Physical Review Letters. ,vol. 69, pp. 1608- 1611 ,(1992) , 10.1103/PHYSREVLETT.69.1608