# CONTACT

Section can be repeated.

Parameters for defining device contacts. [Edit on GitHub]

## Keywords

- BANDWIDTH

- INJECTING_CONTACT

- INJECTION_SIGN

- N_ATOMS

- START

## Keyword descriptions

BANDWIDTH: integer = 0

  Usage: BANDWIDTH <integer>

  The number of neighboring unit cells that one unit cell interacts with. [Edit on GitHub]

INJECTING_CONTACT: logical = T

  Lone keyword: `T`

  whether or not the contact can inject electrons. [Edit on GitHub]

INJECTION_SIGN: enum = POSITIVE

  Usage: INJECTION_SIGN <integer>

  Valid values:

  - `POSITIVE` When the contact unit cell is at the upper left corner of the Hamiltonian.

  - `NEGATIVE` When the contact unit cell is at the lower right corner of the Hamiltonian.

  Contact unit cell interacts with unit cells to the right (positive) or to the left (negative). [Edit on GitHub]

N_ATOMS: integer = 0

  Usage: N_ATOMS <integer>

  Number of atoms in the contact unit cell. [Edit on GitHub]

START: integer = 0

  Usage: START <integer>

  Index of the first atom in the contact unit cell. Set to 0 to define the contact unit cell as the first/last N_ATOMS of the structure (after cutout) [Edit on GitHub]