  We develop a nonequilibrium increment method to compute the R\'enyi
entanglement entropy and investigate its scaling behavior at the deconfined
critical (DQC) point via large-scale quantum Monte Carlo simulations. To
benchmark the method, we first show that at an conformally-invariant critical
point of O(3) transition, the entanglement entropy exhibits universal scaling
behavior of area law with logarithmic corner corrections and the obtained
correction exponent represents the current central charge of the critical
theory. Then we move on to the deconfined quantum critical point, where
although we still observe similar scaling behavior but with a very different
exponent. Namely, the corner correction exponent is found to be negative. Such
a negative exponent is in sharp contrast with positivity condition of the
R\'enyi entanglement entropy, which holds for unitary conformal field
theories(CFT). Our results unambiguously reveal fundamental differences between
DQC and quantum critical points(QCPs) described by unitary CFTs.

Strongly Correlated Electrons;High Energy Physics - Theory