Doping asymmetry in the three-band Hamiltonian for cuprate ladders: Failure of the standard model of superconductivity in cuprates
Doping asymmetry in the three-band Hamiltonian for cuprate ladders: Failure of the standard model of superconductivity in cuprates
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DOI：
10.1103/physrevb.107.l241108
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发表时间：
2023-02
影响因子：
3.7
通讯作者：
J. Song;S. Mazumdar;R. T. Clay
中科院分区：
文献类型：
--
作者：
J. Song;S. Mazumdar;R. T. Clay
单带二维Hubbard模型与掺杂铜酸盐超导性的相关性最近受到质疑，基于扩展t-J模型的密度矩阵重整化群（DMRG）计算，该模型发现电子掺杂后在不切实际的宽掺杂区域上具有超导性，但完全没有空穴掺杂的超导性。我们报告非常相似的结果从DMRG计算Cu $_2$O$_3 $两个腿梯子内的父三带相关电子哈密顿量。在我们的计算中发现的强烈的不对称性是在矛盾的电子和空穴掺杂的铜酸盐超导体之间的深刻和深刻的对称性，除了他们的临界温度，已被发现从最近的实验。
The relevance of the single-band two-dimensional Hubbard model to superconductivity in the doped cuprates has recently been questioned, based on Density matrix Renormalization Group (DMRG) computations on extended t-J models that found superconductivity over unrealistically broad doping region upon electron-doping, yet complete absence of superconductivity for hole-doping. We report very similar results from DMRG calculations on Cu$_2$O$_3$ two-leg ladder within the parent three-band correlated-electron Hamiltonian. The strong asymmetry found in our calculations are in contradiction to the deep and profound symmetry between electron- and hole-doped cuprate superconductors, apart from their critical temperatures, that has been found from recent experiments.