Indications of spin-charge separation in the two-dimensional extended t - J model
Indications of spin-charge separation in the two-dimensional extended t - J model
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DOI：
10.1103/physrevb.60.r3716
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发表时间：
1999-04
影响因子：
3.7
通讯作者：
G. Martins;R. Eder;E. Dagotto
中科院分区：
文献类型：
--
作者：
G. Martins;R. Eder;E. Dagotto
利用近年来未掺杂铜离子${\ mathm {Ca}}_{2}{\ mathm {CuO}}_{2}{\ mathm {Cl}}_{2}$ [F]的光发射实验，在广泛的参数空间范围内对二维扩展的$t\ensuremath{-}J$模型进行了计算研究。罗宁等，科学，282,2067(1998)]。单空穴基态显示出被移动空穴（即穿过空穴）隔开的自旋之间的鲁棒反铁磁（AF）相关性。这种效应倾向于将电荷与自旋解耦，准粒子的重量变得可以忽略不计，特别是在动量$(0,\ensuremath{\pi})\ensuremath{-}（\ensuremath{\pi},0）处。有更多空穴的研究显示了金属条纹形成的前体，空穴共享它们各自的自旋排列，以及在条纹上产生的AF相关性。
The two-dimensional extended $t\ensuremath{-}J$ model is studied computationally in a broad region of parameter space, motivated by recent photoemission experiments for the undoped cuprate ${\mathrm{Ca}}_{2}{\mathrm{CuO}}_{2}{\mathrm{Cl}}_{2}$ [F. Ronning et al., Science 282, 2067 (1998)]. The one-hole ground state is shown to develop robust antiferromagnetic (AF) correlations between spins separated by the mobile hole (i.e., across the hole). This effect tends to decouple charge from spin, and the quasiparticle weight becomes negligible, particularly at momenta $(0,\ensuremath{\pi})\ensuremath{-}(\ensuremath{\pi},0).$ Studies with more holes show precursors of metallic stripe formation, with holes sharing their individual spin arrangements, and AF correlations generated across the stripe.