论文标题
高温超导粉末中有效配对相互作用的轨道结构
Orbital structure of the effective pairing interaction in the high-temperature superconducting cuprates
论文作者
论文摘要
有效相互作用的性质，负责在高温超导层中配对的有效相互作用尚未确定。这个问题已使用简化的单频哈伯德模型进行了广泛的研究，该模型并未明确考虑相关CUO $ _2 $ planes的轨道自由度。在这里，我们使用动态簇量蒙特卡洛近似来研究三频哈伯德模型中配对相互作用的轨道结构，该模型明确处理轨道的自由度。我们发现这种相互作用主要作用在相邻的铜轨道之间，但在周围的键合分子氧轨道上出现了显着的额外重量。通过将这些结果与简单的单频哈伯德模型的结果明确比较，我们的研究为描述丘比特的超导性的单带框架提供了强有力的支持。
The nature of the effective interaction responsible for pairing in the high-temperature superconducting cuprates remains unsettled. This question has been studied extensively using the simplified single-band Hubbard model, which does not explicitly consider the orbital degrees of freedom of the relevant CuO$_2$ planes. Here, we use a dynamic cluster quantum Monte Carlo approximation to study the orbital structure of the pairing interaction in the three-band Hubbard model, which treats the orbital degrees of freedom explicitly. We find that the interaction predominately acts between neighboring copper orbitals, but with significant additional weight appearing on the surrounding bonding molecular oxygen orbitals. By explicitly comparing these results to those from the simpler single-band Hubbard model, our study provides strong support for the single-band framework for describing superconductivity in the cuprates.
