Universal term of Entanglement Entropy in the $\pi$-flux Hubbard model

Understand

Researchers in physical science aim to uncover universal features in strongly interacting many-body systems, often hidden in complicated observables like entanglement entropy (EE).

• The non-local nature of EE makes it challenging to compute numerically, necessitating the development of an unbiased and convenient algorithm.
• In this paper, we use quantum Monte Carlo to reveal that the coefficient of variation in direct EE calculations increases exponentially with system size, leading to inaccuracies.
• To address this issue, we develop a power incremental algorithm and a technique for straightforwardly calculating the universal term of EE, successfully evaluating the EE of a 2D Hubbard model.