PairPotential¶
- class PairPotential(element_pair, distances, values)¶
Input class for setting the repulsive pair potential between two elements in the
HuckelCalculator
.- Parameters:
element_pair (tuple of
PeriodicTableElement
) – The two elements to set the pair potential for.distances (PhysicalQuantity of type length) – A list of distances for the pair potential. The length of this vector should be len(
values
).values (PhysicalQuantity of type energy) – The values of the pair potential at the given distances. The length of this vector should be len(
distances
).
- distances()¶
- Returns:
The distances of the pair potential.
- Return type:
PhysicalQuantity of type length
- elementPair()¶
- Returns:
The element pair of the pair potential.
- Return type:
tuple of
PeriodicTableElement
- uniqueString()¶
Return a unique string representing the state of the object.
- values()¶
- Returns:
The values of the pair potential.
- Return type:
PhysicalQuantity of type energy
Usage Examples¶
Make a repulsive exponential pair potential between two carbon atoms
# Define a cutoff distance
rc = 4.
# Define a list of distances
distances = numpy.linspace(0.0,rc,401)
# Evaluate an exponential function at the distance
# (subtract the value in the endpoint to make it go to 0)
values = 50.*(numpy.exp(-3.*distances)-numpy.exp(-3.*rc))
# Setup the pair potential object
pair_potential = PairPotential(
element_pair = (Carbon, Carbon),
distances = distances * Bohr,
values = values * eV,
)
Notes¶
The PairPotential is used to define a pair wise interaction between two elements. It is used to define the repulsive term for HuckelCalculator, DeviceHuckelCalculator, SlaterKosterCalculator and DeviceSlaterKosterCalculator.