t-J model on the effective brick-wall lattice for the recently discovered high-temperature superconductor Ba2CuO3+delta
t-J model on the effective brick-wall lattice for the recently discovered high-temperature superconductor Ba2CuO3+delta
复制标题
最近发现的高温超导体 Ba2CuO3 δ 有效砖墙晶格的 t-J 模型
DOI：
10.1103/physrevb.101.180509
复制
发表时间：
2020
影响因子：
3.7
通讯作者：
Zhang Fu-Chun
中科院分区：
文献类型：
--
作者：
Wang Zhan;Zhou Sen;Chen Weiqiang;Zhang Fu-Chun
Layered copper oxides have the highest superconducting transition temperatures at ambient pressure. Its mechanism remains a major challenge in condensed matter physics. The essential physics lying in two-dimensional copper-oxygen layers is well described by a single-band Hubbard model or its strong-coupling limitmodel in a two-dimensional square lattice. The recently discovered high-temperature superconductorwithhas a different crystal structure with a large portion of in-plane oxygen vacancies. We observe that an oxygen vacancy breaks the bond of its two neighboring copper atoms, and propose the ordered vacancies inlead to an extendedmodel on an effective brick-wall lattice. For the nearest-neighbor hopping, the brick-wall model can be mapped onto themodel on a honeycomb lattice. Our theory explains the superconductivity ofat a high charge carrier density, and predicts a time-reversal symmetry-broken pairing state.
