Nonlocal van der Waals density functional made simple and efficient

We present a simple revision of the VV10 nonlocal density functional by Vydrov and Van Voorhis J. Chem. Phys. 133, 244103 (2010) for dispersion interactions. Unlike the original functional our modification allows nonlocal correlation energy and its derivatives to be efficiently evaluated in a plane wave framework along the lines pioneered by Rom\'an-P\'erez and Soler Phys. Rev. Lett. 103, 096102 (2009). Our revised functional maintains the outstanding precision of the original VV10 in noncovalently bound complexes and performs well in representative covalent, ionic, and metallic solids.