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It has been recently shown that the Tao-Mo (TM) [J. Tao and Y. Mo, Phys. Rev. Lett. 117, 073001 (2016)] semilocal exchange-correlation energy functional suffers from the order-of-limit problem, which affects the functional performance in phase transition pressures [Furness et al., J. Chem. Phys. 152, 244112 (2020)]. The root of the order-of-limit problem of the TM functional is inherent within the interpolation function, which acts as a switch between the compact density and the slowly varying density. This paper proposes a different switch function that avoids the order-of-limit problem and correctly interpolates the compact density and the slowly varying fourth-order density correction. By circumventing the order-of-limit problem, the proposed form enhances the applicability of the original TM functional on the diverse nature of solid-state properties. Our conclusion is ensured by examining the functional in predicting properties related to general-purpose solids, quantum chemistry, and phase transition pressure. Besides, we discuss the connection between the order-of-limit problem, phase transition pressure, and bandgap of solids.

A way of resolving the order-of-limit problem of Tao–Mo semilocal functional