Particle Class Reference

Determines whether we are dealing with phonons or electrons. More...

#include <particle.h>

Public Member Functions
	Particle (int kind_)
	Constructor of Statistics. More...
double	getPopulation (const double &energy, const double &temperature, const double &chemicalPotential=0.) const
	Returns either a Bose–Einstein or a Fermi–Dirac distribution, depending on the value of "statistics". More...
double	getDndt (const double &energy, const double &temperature, const double &chemicalPotential=0., const bool &symmetrize=false) const
	Returns dn/dT, with T temperature, and n being either a Bose–Einstein or a Fermi–Dirac distribution, depending on the value of "statistics" NOTE: this is off by a factor of kB! dn/dT = n(n+/-1) * energy / kB T^2 Here, we are returning something which is (kB * T)^2 It might be good to change this, but it's used other places and this would require careful fixing. More...
double	getDnde (const double &energy, const double &temperature, const double &chemicalPotential=0., const bool &symmetrize=false) const
	Returns dn/dE, with E the particle energy, and n being either a Bose or Fermi distribution, depending on the value of "statistics". More...
double	getPopPopPm1 (const double &energy, const double &temperature, const double &chemicalPotential=0.) const
	Returns bose(bose+1) for bosons, fermi(1-fermi) for fermions. More...
bool	isFermi () const
	Method to check if the particle is a fermion.
bool	isBose () const
	Method to check if the particle is a boson.
bool	isElectron () const
	Method to check if the particle is an electron.
bool	isPhonon () const
	Method to check if the particle is a phonon.
int	getParticleKind () const

Static Public Attributes
static const int	electron = -1
static const int	phonon = -2

Detailed Description

This class decides whether we are dealing with phonons or electrons. Additionally, it contains the functionality to compute equilibrium occupation numbers, i.e. Fermi-Dirac or Bose-Einstein distributions, their derivatives w.r.t. temperature or energy, and factors N(N+1) or F(1-F).

Statistics

Constructor & Destructor Documentation

Particle()

Particle::Particle ( int  kind_ )

explicit

Saves which kind of particle we are dealing with.

Parameters

statistics

an integer equal to Statistics::electron or Statistics::phonon.

Member Function Documentation

getDnde()

double Particle::getDnde	(	const double &	energy,
		const double &	temperature,
		const double &	chemicalPotential = 0.,
		const bool &	symmetrize = false
	)		const

Parameters

energy	value of quasiparticle energy.
temperature	value of temperature.
chemicalPotential	0 by default, set a value for electrons.
symmetrize	false by default, if true rescales dndt by a factor 1/sqrt(f(1-f)) or 1/sqrt(n(1+n)). Used for the symmetrized BTE.

Returns

dndE: derivative wrt QP energy of the equilibrium distribution.

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getDndt()

double Particle::getDndt	(	const double &	energy,
		const double &	temperature,
		const double &	chemicalPotential = 0.,
		const bool &	symmetrize = false
	)		const

Parameters

energy	value of quasiparticle energy.
temperature	value of temperature.
chemicalPotential	0 by default, set a value for electrons.
symmetrize	false by default, if true rescales dndt by a factor 1/sqrt(f(1-f)) or 1/sqrt(n(1+n)). Used for the symmetrized BTE.

Returns

dndT: derivative wrt temperature of the equilibrium distribution

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getPopPopPm1()

double Particle::getPopPopPm1	(	const double &	energy,
		const double &	temperature,
		const double &	chemicalPotential = 0.
	)		const

Parameters

energy	value of quasiparticle energy.
temperature	value of temperature.
chemicalPotential	0 by default, set a value for electrons.

Returns

popPopPm1: bose(bose+1) for bosons, fermi(1-fermi) for fermions.

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getPopulation()

double Particle::getPopulation	(	const double &	energy,
		const double &	temperature,
		const double &	chemicalPotential = 0.
	)		const

Parameters

energy	value of quasiparticle energy.
temperature	value of temperature.
chemicalPotential	0 by default, set a value for electrons.

Returns

n: either the Bose or Fermi population.

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