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The electron addition spectrum A+(k,omega) is obtained analytically for the one-dimensional (1D) supersymmetric t-J model with 1/r2 interaction. The result is obtained first for a small-sized system and its validity is checked against the numerical calculation. Then the general expression is found which is valid for arbitrary size of the system. The thermodynamic limit of A+(k,omega) has a simple analytic form with contributions from one spinon, one holon, and one antiholon-all of which obey fractional statistics. The upper edge of A+(k,omega) in the (k,omega) plane includes a delta-function peak which reduces to that of the single-electron band in the low-density limit. 相似文献
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F. Pan M.-X. Xie J.-J. Lin X.-G. Xue J. P. Draayer 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,72(4):479-484
The one-dimensional t-J
model Hamiltonian is realized by using hard-core boson operators. A
simple algorithm written in Mathematica based on a differential
realization of the hard-core bosons for finding exact solutions of
the model is proposed. As a simple example, some low-lying
excitation energies, the inverse compressibility, and the
superconducting structure factors, as well as the particle and spin
entanglement of a system with 8 sites are calculated. The results
not only confirm the validity of the hard-core boson picture, but
also indicate that a quantum phase transition near phase-separation
at zero temperature can also be recognized by the particle and spin
entanglement. 相似文献
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对一维玻色-哈伯模型进行了细致的研究, 得出了无界空间中的孤子解, 还求出了周期性边界条件下的精确椭圆函数波解和孤子解, 并得出了解的能量和有效质量. 相似文献
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Hanqin Ding Yanshen Wang 《The European Physical Journal B - Condensed Matter and Complex Systems》2011,79(2):169-175
Using the deformed Hubbard operator approach, we analytically study weak-coupling phase diagram of the one-dimensional t-J-V model at half filling. In the case of small deformed parameter ζ(≪1), the interactions induced by the no double occupancy constraint are softened, accessible by the bosonization field theory
and the renormalization group technique. The ground state exhibits insulating behavior of density-wave correlations. The bond-spin-density-wave
(BSDW) and
bond-charge-density-wave (BCDW) phases are realized in the whole weak-coupling regime while the charge-density-wave (CDW)
and spin-density-wave (SDW) phases depend on V/J > (V/J)
c
or V/J < (V/J)
c
, where (V/J)
c
= 1/4. Furthermore, our results are expected to adiabatically continue back to ζ = 1. 相似文献
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Solitary excitations in one-dimensional ferromagnetic spin chains with biquadratic exchange interaction 下载免费PDF全文
By using the traveling wave method, the solutions of the elliptic function wave and the solitary wave are obtained in a ferromagnetic spin chain with a biquadratic exchange interaction, a single ion anisotropic interaction and an anisotropic nearest neighbour interaction. The effects of the biquadratic exchange interaction and the single ion anisotropic interaction on the properties (width, peak and stability) of the soliton are investigated. It is also found that the effects vary with the strengths of these interactions. 相似文献