Wang Lei, Troyer Matthias
Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland.
Phys Rev Lett. 2014 Sep 12;113(11):110401. doi: 10.1103/PhysRevLett.113.110401. Epub 2014 Sep 10.
We present a new algorithm for calculating the Renyi entanglement entropy of interacting fermions using the continuous-time quantum Monte Carlo method. The algorithm only samples the interaction correction of the entanglement entropy, which by design ensures the efficient calculation of weakly interacting systems. Combined with Monte Carlo reweighting, the algorithm also performs well for systems with strong interactions. We demonstrate the potential of this method by studying the quantum entanglement signatures of the charge-density-wave transition of interacting fermions on a square lattice.
我们提出了一种新算法，用于使用连续时间量子蒙特卡罗方法计算相互作用费米子的雷尼纠缠熵。该算法仅对纠缠熵的相互作用修正进行采样，通过设计确保了弱相互作用系统的高效计算。结合蒙特卡罗重加权，该算法对于强相互作用系统也表现良好。我们通过研究方形晶格上相互作用费米子的电荷密度波转变的量子纠缠特征，展示了这种方法的潜力。
