论文标题
预计的D-Wave超导状态：费米金投影纠缠的一对状态研究
Projected d-wave superconducting state: a fermionic projected entangled pair state study
论文作者
论文摘要
我们使用其费米子预测的纠缠配对状态（FPEPS）表示预测的D波配对状态的物理学。首先，我们使用高斯FPEP近似D-Wave Bardeen-Cooper-Schrieffer状态。接下来，我们将结果状态转换为FPEPS张量，并实施Gutzwiller投影，该预测通过修改局部张量元件来消除双重占用率。投影的D波配对状态的张量网络表示使我们能够在热力学极限中评估物理量，而无需使用Gutzwiller近似。尽管有很少的变异参数，但这种出于物理动机的张量网络仍显示出对掺杂的T-J模型的竞争能量。我们希望这种构造为各种张量网络计算提供了有用的初始状态和指导。
We investigate the physics of projected d-wave pairing states using their fermionic projected entangled pair state (fPEPS) representation. First, we approximate a d-wave Bardeen-Cooper-Schrieffer state using the Gaussian fPEPS. Next, we translate the resulting state into fPEPS tensors and implement the Gutzwiller projection which removes double occupancy by modifying the local tensor elements. The tensor network representation of the projected d-wave pairing state allows us to evaluate physical quantities in the thermodynamic limit without employing the Gutzwiller approximation. Despite having very few variational parameters, such physically motivated tensor network states are shown to exhibit competitive energies for the doped t-J model. We expect that such construction offers useful initial states and guidance for variational tensor network calculations.
