论文标题
具有动态平均场理论的一频哈伯德模型中的电荷和配对密度波订单
Charge- and pair-density-wave orders in the one-band Hubbard model with dynamical mean field theory
论文作者
论文摘要
我们在高$ t_c $超导蛋糕的一频哈伯德模型中研究电荷密度波及其与超导性的竞争。我们在$ t = 0 $时使用群集动态平均场理论（CDMFT）。一频哈伯德模型仅包含铜原子，并且在这种情况下，位于氧原子上的电荷过量的物理电荷密度波在这种情况下表现为键密度波（BDW）。它纯粹来自局部相关效应，并且在存在$ d $ - 波超导率的情况下也会导致$ s'$ - 波配对密度波。 $ d $ - 波BDW因增加$ u $而受到压制，并受到对增加第二次邻居跳跃$ t'$的幅度的青睐。此外，在实验中可以看到，在与超导率竞争时，$ d $ - 波BDW订单会减弱。此外，与正常状态相比，在超导状态下，它在不同的$ u $方面的行为差异很大。
We study the charge-density-wave order and its competition with superconductivity in the one-band Hubbard model for high-$T_c$ superconducting cuprates. We use cluster dynamical mean field theory (CDMFT) at $T=0$. The one-band Hubbard model only contains copper atoms, and a physical charge-density-wave with charge excesses located on the oxygen atoms manifests itself as a bond-density-wave (BDW) within this context. It arises purely out of local correlation effects and also leads to a $s'$-wave pair-density-wave in the presence of $d$-wave superconductivity. The $d$-wave BDW is suppressed on increasing $U$ and is favored on increasing the magnitude of the second-neighbor hopping $t'$. Further, the $d$-wave BDW order is weakened when in competition with superconductivity, as seen in experiments. Additionally it behaves quite differently on varying $U$ in the superconducting state compared to the normal state.
