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首页> 外文期刊>Physica, C. Superconductivity and its applications >Spectral properties of doped bilayer high T-c cuprates: Role of intra-bilayer coupling
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Spectral properties of doped bilayer high T-c cuprates: Role of intra-bilayer coupling

机译：掺杂的双层高T-c铜酸盐的光谱性质：双层内耦合的作用

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The present paper deals with the study of the spectral properties of optimal and overdoped bilayer high-T-c cuprates in their normal state. The strong electron correlation effects and the various hopping energies that predominate in CuO2 layers in cuprates are considered within a t-t'-J model. For the cuprates where the unit cell contains two CuO2 planes, we consider coupling between the planes, in the same unit cell. The kinetic energy part of the model Hamiltonian has been treated within an approximation and to avoid double occupancy of sites the electron correlation are treated in the limit of strong Coulomb interaction. The exchange part of the model Hamiltonian is treated within a mean field approximation. With these approximations we have calculated spectral function and density of states of bilayer cuprates by using the Green's function technique. The electronic spectral function is calculated as a function of intra-bilayer coupling in optimal and overdoped regimes, at (pi, 0) point of the Brillouin zone. We find that the spectral function shows a splitting near (pi, 0) point of the Brillouin zone in overdoped region which is in agreement with the photoemission experiments on the electronic spectra of doped bilayer cuprates. We have also computed numerically the density of states of bilayer cuprates in their normal state as a function of intra-bilayer coupling and hole density and compared the results with recent experiments. (c) 2005 Elsevier B.V. All rights reserved.
机译：本文致力于研究最佳和过量掺杂的双层高T-c铜酸盐在正常状态下的光谱特性。在t-t'-J模型中考虑了强电子相关效应和铜酸盐中CuO2层中占优势的各种跳跃能。对于单位单元包含两个CuO2平面的铜酸盐，我们考虑在同一单位单元中这些平面之间的耦合。已对哈密顿量模型的动能部分进行了近似处理，为避免位点重复占据，在强库仑相互作用的范围内对电子相关性进行了处理。模型哈密顿量的交换部分在平均场近似内进行处理。通过这些近似，我们已经使用格林函数技术计算了双层铜酸盐的光谱函数和状态密度。在布里渊区的（pi，0）点处，在最佳和超掺杂状态下，计算电子光谱函数为双层内耦合的函数。我们发现，光谱函数显示出在超掺杂区域中布里渊区附近的（pi，0）点分裂，这与掺杂的双层铜酸盐的电子光谱的光发射实验一致。我们还计算了双层铜酸盐在其正常状态下的状态密度，作为双层内耦合和空穴密度的函数，并将结果与​​最近的实验进行了比较。 （c）2005 Elsevier B.V.保留所有权利。

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