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首页> 外文期刊>Physica, B. Condensed Matter >Large non-adiabatic hole polarons and matrix element effects in the angle-resolved photoemission spectroscopy of dielectric cuprates
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Large non-adiabatic hole polarons and matrix element effects in the angle-resolved photoemission spectroscopy of dielectric cuprates

机译：介电铜酸盐的角度分辨光发射光谱中的大非绝热空穴极化子和基质元素效应

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We propose a generalization of the conventional theory based on the assumption of the well-isolated Zhang-Rice (1)A(1g) singlet to be a first electron-removal state in insulating copper oxide. The photohole is assumed to be localized on either small (pseudo) Jahn-Teller (PJT) polaron or large non-adiabatic polaron-enclosed one or four to five CuO4 centers, respectively, with active one-center valent ((1)A(1g)-E-1.3(u)) manifold. In the framework of the cluster model we have performed the model microscopic calculation of the k-dependence of the matrix element effects and photon polarization effects for the angle-resolved photoemission (ARPES) in insulating cuprates like Sr2CuO2Cl2. We show that effects like the "remnant Fermi surface" detected in the ARPES experiment for Ca2CuO2Cl2 may be. in fact, the manifestation of the matrix element effects rather than of the original band-structure Fermi surface or strong antiferromagnetic correlations. The measured dispersion-like features in the low-energy part of the ARPES spectra may be the manifestation of the complex momentum-dependent spectral line shape of the large PJT polaron response, in addition to the dispersion effect for the well-isolated Zhang-Rice singlet in antiferro-magnetic matrix. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 42]
机译：我们基于良好隔离的Zhang-Rice（1）A（1g）单重态为绝缘氧化铜中第一个电子去除态的假设，提出了常规理论的概括。假定光孔位于局域的小（伪）Jahn-Teller（PJT）极化子或大的非绝热极化子上，分别被一或四到五个CuO4中心包围，并具有活跃的一中心价（（1）A（ 1g）-E-1.3（u））歧管。在群集模型的框架中，我们对绝缘铜酸盐（如Sr2CuO2Cl2）中的角分辨光发射（ARPES）进行了矩阵元素效应和光子极化效应的k依赖性的模型微观计算。我们表明，在ARPES实验中检测到的Ca2CuO2Cl2之类的“残留费米表面”效应可能是。实际上，基体元素效应而不是原始的带结构费米表面或强反铁磁相关性的体现。在ARPES光谱的低能部分中测得的像分散一样的特征可能是大PJT极化子响应的复杂的动量依赖谱线形状的表现，以及对良好隔离的张米的色散效应铁磁矩阵中的单重态。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：42]

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