论文标题
沮丧的铁磁链中绑定的磁蛋白簇的激发和运输
Excitation and transport of bound magnon clusters in frustrated ferromagnetic chain
论文作者
论文摘要
我们研究了磁性激发和挫折的自旋链的自旋传输特性，该链条用铁磁性近邻居和抗铁磁磁性的下一个邻居交换耦合在磁场中通过密度 - 矩阵重ren量化组方法。在田间引起的四极杆和八极式式方案中，低能激发分别受两种和三麦克农结合状态的控制，因此结合的木蛋白簇将有助于旋转运输。我们表明，当系统从四极制度转变为八振杆机制时，旋转电流相关性会降低。这表明自旋传输在八杆方向上受到抑制，尽管结合的三麦克农簇具有比绑定的两麦克农簇更大的角动量。
We investigate magnetic excitations and spin transport properties of a frustrated spin chain with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange couplings in a magnetic field by density-matrix renormalization group methods. In the field-induced quadrupole and octupole regimes, the low-energy excitation is governed by two- and three-magnon bound states, respectively, so that bound magnon clusters would contribute to the spin transport. We show that spin current correlations decrease when the system goes from the quadrupole regime into the octupole regime. This indicates that the spin transport is suppressed in the octupole regime, although bound three-magnon clusters carry a larger amount of angular momentum than bound two-magnon clusters.
