论文标题
铁乙二醇高-TC超导体中的量子至关重旋转密度波
Quantum-Critical Spin-Density Waves in Iron-Selenide High-Tc Superconductors
论文作者
论文摘要
最近提出了带有Neel排序载体（PI，PI）的隐藏旋转密度波（HSDW）作为对电子掺杂的铁 - 羟基超导体的母体。掺杂这样的地面可以导致可见的电子型费米表面袋，而在折叠的布里鲁因区域的角落的孔型费米表面袋。最近已经预测了电子型和孔型费米表面之间在符号中交替的库珀对不稳定。以前是由于电子和孔与与量子关键点接近的HSDW阶连接的隐藏自旋波动的相互作用。通过增加HSDW状态的Hund统治力量来调节量子关键。我们发现，临界HSDW状态中电子/孔通过电子/孔的隐藏自旋波动的交换导致渐近自由。特别是，与HSDW阶范围相比，在长度尺度上，自旋相互作用的强度变得越短，较短。然后，我们认为弦指出，在HSDW中连接良好的分离粒子/孔激发是可靠的。这表明了一张图片，以前提到的自由度被限制在其中。
Hidden spin-density waves (hSDW) with Neel ordering vector (pi,pi) have been proposed recently as parent groundstates to electron-doped iron-selenide superconductors. Doping such groundstates can result in visible electron-type Fermi surface pockets and faint hole-type Fermi surface pockets at the corner of the folded Brillouin zone. A Cooper pair instability that alternates in sign between the electron-type and the hole-type Fermi surfaces has recently been predicted. The previous is due to the interaction of electrons and holes with hidden spin fluctuations connected with hSDW order that is near a quantum-critical point. Quantum criticality is tuned in by increasing the strength of Hund's Rule from the hSDW state. We find that the exchange of hidden spin fluctuations by electrons/holes in the critical hSDW state results in asymptotic freedom. In particular, the strength of spin-flip interactions becomes weaker and weaker on length scales that are shorter and shorter compared to the range of hSDW order. We then argue that string states that connect well-separated particle/hole excitations in the hSDW are robust. This suggests a picture where the hole degrees of freedom mentioned previously are confined.
