TY  - JOUR
TI  - Generalized Gradient Approximation Made Simple
AU  - John P. Perdew
AU  - Kieron Burke
AU  - Matthias Ernzerhof
PY  - 1996
JO  - Physical Review Letters
DO  - 10.1103/physrevlett.77.3865
UR  - https://doi.org/10.1103/physrevlett.77.3865
AB  - Generalized gradient approximations (GGA's) for the exchange-correlation energy improve upon the local spin density (LSD) description of atoms, molecules, and solids. We present a simple derivation of a simple GGA, in which all parameters (other than those in LSD) are fundamental constants. Only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked. Improvements over PW91 include an accurate description of the linear response of the uniform electron gas, correct behavior under uniform scaling, and a smoother potential.
ER  -