论文标题
Kitaev旋转梯子中的通量移动性离域
Flux mobility delocalization in the Kitaev spin ladder
论文作者
论文摘要
我们研究Kitaev Spin- $ 1/2 $梯子，该模型由于交换挫败感引起的分数而表现出自定位。当应用弱磁场时，该模型将通过有效的费米子哈密顿量描述，并具有额外的时间反向对称性破坏项。我们表明，仅此术语就无法将系统定位，但通量移动性是一种先决条件。对于更大但与通量间隙相当的磁场，通量变得可移动，并将系统驱动到具有有限直流运输系数的离域态度。我们的发现基于数值技术，精确的对角和动态量子典型性，从中，我们呈现了特定热量的结果，动态能电流相关函数以及反向参与率，将自旋与费米亚表示形成对比。将推测我们的结果对模型的二维扩展的影响。
We study the Kitaev spin-$1/2$ ladder, a model which exhibits self-localization due to fractionalization caused by exchange frustration. When a weak magnetic field is applied, the model is described by an effective fermionic Hamiltonian, with an additional time reversal symmetry breaking term. We show that this term alone is not capable of delocalizing the system but flux mobility is a prerequisite. For magnetic fields larger but comparable to the flux gap, fluxes become mobile and drive the system into a delocalized regime, featuring finite dc transport coefficients. Our findings are based on numerical techniques, exact diagonalization and dynamical quantum typicality, from which, we present results for the specific heat, the dynamical energy current correlation function, as well as the inverse participation ratio, contrasting the spin against the fermion representation. Implications of our results for two-dimensional extensions of the model will be speculated on.
