论文标题
以隐藏的字符串顺序参数为特征的对密度波
Pair density wave characterized by a hidden string order parameter
论文作者
论文摘要
超导状态的复合配对结构在两腿$ t $ - $ j $型号中密度矩阵重质化组研究揭示了。配对顺序参数由配对振幅和相位因子组成，其中后者明确地取决于自旋背景，其分析形式在各向异性极限中鉴定为链链积分$ t _ {\ perp} \ rightarrow 0 $。这种类似弦的相位因子是由旋转偏振诱导的一对密度波（PDW），并用波形$ q _ {\ mathrm {pdw}} =2πm$（$ m $ the Magnatization）。相比之下，配对振幅保持光滑，未经PDW不变。特别是，局部自旋极化会导致局部缺陷范围参数的符号变化。与Fulde-Ferrell-larkin-ovchinnikov状态不同，这里的非局部相位因子是表征PDW的新阶参数，其起源可以追溯到掺杂的Mott Mitulator的基本符号结构。
A composite pairing structure of superconducting state is revealed by density matrix renormalization group study in a two-leg $t$-$J$ model. The pairing order parameter is composed of a pairing amplitude and a phase factor, in which the latter explicitly depends on the spin background with an analytic form identified in the anisotropic limit as the interchain hopping integral $t_{\perp}\rightarrow 0$. Such a string-like phase factor is responsible for a pair density wave (PDW) induced by spin polarization with a wavevector $Q_{\mathrm {PDW}}=2πm$ ($m$ the magnetization). By contrast, the pairing amplitude remains smooth, unchanged by the PDW. In particular, a local spin polarization can give rise to a sign change of the order parameter across the local defect. Unlike in an Fulde-Ferrell-Larkin-Ovchinnikov state, the nonlocal phase factor here plays a role as the new order parameter characterizing the PDW, whose origin can be traced back to the essential sign structure of the doped Mott insulator.
