# Category:Meta-GGA

**Meta-GGAs** are a family of exchange-correlation functionals that in addition to the electron density , its gradient depend on

- the kinetic-energy density , and/or
- the Laplacian of the electron density .

Thus, the exchange-correlation energy can be written as

Although **meta-GGAs** are slightly more expensive than GGAs, they are still fast to evaluate and appropriate for very large systems. Furthermore, meta-GGAs can be more accurate than GGAs and more broadly applicable. Note that as in most other codes, **meta-GGAs** are implemented in VASP (see METAGGA) within the generalized KS scheme^{[1]}.

## How to

A **meta-GGA functional** can be used by specifying

in the INCAR file.

How to do a band-structure calculation using meta-GGA functionals.