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We recently developed a scheme to use low-cost calculations to find a singletwist angle where the couple cluster doubles energy of a single calculationmatches the twist-averaged coupled cluster doubles energy in a finite unitcell. We used initiator full configuration interaction quantum Monte Carlo($i$-FCIQMC) as an example of an exact method beyond coupled cluster doublestheory to show that this selected twist angle approach had comparable accuracyin methods beyond coupled cluster. Further, at least for small system sizes, weshow that the same twist angle can also be found by comparing the energydirectly (at the level of second-order Moller-Plesset theory) suggesting aroute toward twist angle selection which requires minimal modification toexisting codes which can perform twist averaging.

Accelerating convergence to the thermodynamic limit with twist angle selection applied to methods beyond many-body perturbation theory