Electronic structure of solids with WIEN2k

Abstract Aspects of the progress over the last 40–50 years in calculating the electronic structure of solids and surfaces are sketched in the context of collaboration on the code now called WIEN2k. Different facets that are relevant for material sciences are discussed, ranging from quantum mechanics to the augmented plane wave (APW) method, as well as improvements in computer hardware and algorithms and related numerical accuracy. In this long period, the complexity and realism of applications to condensed matter systems has significantly increased and many properties which are closely related to experiments can now be calculated. This progress is illustrated by the fact that WIEN2k now is used worldwide by more than 1600 groups. The major steps in this development are illustrated for a few selected examples. Keywords: quantum mechanicsdensity functional theoryaugmented plane wave methodWIEN2ksolidssurfaces Acknowledgements The authors express their thanks to the many people who have contributed to the development of the WIEN2k code (in particular L.D.Marks, and R.Laskowski for the most recent improvements) and its antecedents. SBT stand for the initials of the three authors but also for the third author, who thought up the Gainesville part of this project. He knew what his friends, K.S. and P.B., were doing in Vienna. The long-term friendship among SBT made it possible that WIEN2k is a success story. S.B.T. (the individual) acknowledges support from US Dept. of Energy grant DE-SC-0001239.