论文标题
$ ab $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $
Unconventional dual 1D-2D quantum spin liquid revealed by $ab$ $initio$ studies on organic solids family
论文作者
论文摘要
有机固体有各种电子相。尤其是有机固体的里程碑，$β'$ - $ x $ [pd（dmit）$ _ 2 $] $ _ 2 $，带$ x $ = etme $ _3 $ _3 $ sb显示量子旋转式旋转（qsl）属性，暗示了一种新颖的物质状态。但是，QSL的性质在很大程度上是未知的。在这里，我们在计算上使用2D $ ab $ $ $ $ $ $ $ $ $ hamiltonians进行计算研究五种化合物，并正确地复制了带有防铁磁性订单的实验相图，以$ x $ = me = me $ _4 $ _4 $ p，me $ _4 $ as，我$ _4 $ $ _4 $ sb an可调参数。我们发现，$ x $ = etme $ _3 $ sb的QSL表现为1D性质，其特征是沿一个方向旋转相关的代数衰减，而指数衰减在另一个方向上，表明尺寸从2D降低到1D。 1D性质确实解释了实验性特异性热，导热率和磁化率。然而，已确定的QSL保留了2D性质，并与自旋分数保持在Spinon中，并具有类似狄拉克的无间隙激发，并揭示了双重性桥接1D和2D QSL。
Organic solids host various electronic phases. Especially, a milestone compound of organic solid, $β'$-$X$[Pd(dmit)$_2$]$_2$ with $X$=EtMe$_3$Sb shows quantum spin-liquid (QSL) properties suggesting a novel state of matter. However, nature of the QSL has been largely unknown. Here, we computationally study five compounds comprehensively with different $X$ using 2D $ab$ $initio$ Hamiltonians and correctly reproduce experimental phase diagram with antiferromagnetic order for $X$=Me$_4$P, Me$_4$As, Me$_4$Sb, Et$_2$Me$_2$As and a QSL for $X$=EtMe$_3$Sb without adjustable parameters. We find that the QSL for $X$=EtMe$_3$Sb exhibits 1D nature characterized by algebraic decay of spin correlation along one direction, while exponential decay in the other direction, indicating dimensional reduction from 2D to 1D. The 1D nature indeed accounts for the experimental specific heat, thermal conductivity and magnetic susceptibility. The identified QSL, however, preserves 2D nature as well consistently with spin fractionalization into spinon with Dirac-like gapless excitations and reveals duality bridging the 1D and 2D QSLs.
