sisl.physics.phonon.EigenvaluePhonon

class sisl.physics.phonon.EigenvaluePhonon[source]

Bases: CoefficientPhonon

Eigenvalues of phonon modes, no eigenmodes retained

This holds routines that enable the calculation of density of states.

Methods

`DOS`(E[, distribution])	Calculate DOS for provided energies, E.
`copy`()	Return a copy (only the coefficients are copied).
`degenerate`(atol)	Find degenerate coefficients with a specified precision
`iter`([asarray])	An iterator looping over the coefficients in this system
`occupation`([distribution])	Calculate the occupations for the states according to a distribution function
`remove`(index[, inplace])	Return a new coefficient without the specified coefficients
`sub`(index[, inplace])	Return a new coefficient with only the specified coefficients

Attributes

`c`
`dkind`	The data-type of the coefficient (in str)
`dtype`	Data-type for the coefficients
`hw`	Eigenmode values in units of \(\hbar \omega\) [eV]
`info`
`parent`
`shape`	Returns the shape of the coefficients

DOS(E, distribution='gaussian')[source]

Calculate DOS for provided energies, E.

This routine calls DOS with appropriate arguments and returns the DOS.

See DOS for argument details.

Parameters:: distribution (Literal['gaussian', 'lorentzian', 'fermi', 'bose-einstein', 'cold', 'step-function', 'heaviside'] | ~typing.Callable[[~collections.abc.Buffer | ~numpy._typing._array_like._SupportsArray[~numpy.dtype[~typing.Any]] | ~numpy._typing._nested_sequence._NestedSequence[~numpy._typing._array_like._SupportsArray[~numpy.dtype[~typing.Any]]] | complex | bytes | str | ~numpy._typing._nested_sequence._NestedSequence[complex | bytes | str]], ~numpy.ndarray])

copy()

Return a copy (only the coefficients are copied). parent and info are passed by reference

Parameters:: coefficient (Coefficient)
Return type:: Coefficient

degenerate(atol)

Find degenerate coefficients with a specified precision

Parameters:: atol (float) – the precision above which coefficients are not considered degenerate
Returns:: a list of indices
Return type:: list of numpy.ndarray

iter(asarray=False)

An iterator looping over the coefficients in this system

Parameters:

asarray (bool, optional) – if true the yielded values are the coefficient vectors, i.e. a numpy array. Otherwise an equivalent object is yielded.

Yields:

coeff (Coefficent) – the current coefficent as an object, only returned if asarray is false.
coeff (numpy.ndarray) – the current the coefficient as an array, only returned if asarray is true.

occupation(distribution='bose_einstein')[source]

Calculate the occupations for the states according to a distribution function

Parameters:: distribution (Literal['gaussian', 'lorentzian', 'fermi', 'bose-einstein', 'cold', 'step-function', 'heaviside'] | ~typing.Callable[[~collections.abc.Buffer | ~numpy._typing._array_like._SupportsArray[~numpy.dtype[~typing.Any]] | ~numpy._typing._nested_sequence._NestedSequence[~numpy._typing._array_like._SupportsArray[~numpy.dtype[~typing.Any]]] | complex | bytes | str | ~numpy._typing._nested_sequence._NestedSequence[complex | bytes | str]], ~numpy.ndarray]) – distribution used to find occupations
Returns:: len(self) with occupation values
Return type:: numpy.ndarray

remove(index, inplace=False)

Return a new coefficient without the specified coefficients

Parameters:

index (int | Sequence[int] | Sequence[bool]) – indices that are removed in the returned object
inplace (bool) – whether the values will be removed inplace
coefficient (Coefficient)

Returns:

a new coefficient without containing the requested elements

Return type:

Coefficient

sub(index, inplace=False)

Return a new coefficient with only the specified coefficients

Parameters:

index (int | Sequence[int] | Sequence[bool]) – indices that are retained in the returned object
inplace (bool) – whether the values will be retained inplace
coefficient (Coefficient)

Returns:

a new coefficient only containing the requested elements, only if inplace is false

Return type:

Coefficient

c

property dkind: The data-type of the coefficient (in str)

property dtype: Data-type for the coefficients

property hw: Eigenmode values in units of \(\hbar \omega\) [eV]

info

parent

property shape: Returns the shape of the coefficients