AnalyticalContinuerContinuousFractions.h

/* Copyright 2019 Kristofer Björnson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
#ifndef COM_DAFER45_TBTK_SOLVER_ANALYTICAL_CONTINUER_CONTINUOUS_FRACTIONS
#define COM_DAFER45_TBTK_SOLVER_ANALYTICAL_CONTINUER_CONTINUOUS_FRACTIONS
 
#include "TBTK/Communicator.h"
#include "TBTK/Property/GreensFunction.h"
#include "TBTK/Property/SelfEnergy.h"
#include "TBTK/Solver/Solver.h"
 
#include <complex>
 
namespace TBTK{
namespace Solver{
 
class AnalyticalContinuerContinuousFractions : public Solver, public Communicator{
public:
    AnalyticalContinuerContinuousFractions();
 
    void setEnergyWindow(
        double lowerBound,
        double upperBound,
        int resolution
    );
 
    void setEnergyInfinitesimal(double energyInfinitesimal);
 
    Property::GreensFunction convert(
        const Property::GreensFunction &greensFunction,
        Property::GreensFunction::Type type
    ) const;
private:
    double lowerBound;
 
    double upperBound;
 
    int resolution;
 
    static constexpr double ENERGY_INFINITESIMAL = 0;
 
    double energyInfinitesimal;
 
    std::complex<double> getContourDeformation(
        double energy,
        Property::GreensFunction::Type type
    ) const;
};
 
inline void AnalyticalContinuerContinuousFractions::setEnergyWindow(
    double lowerBound,
    double upperBound,
    int resolution
){
    this->lowerBound = lowerBound;
    this->upperBound = upperBound;
    this->resolution = resolution;
}
 
inline void AnalyticalContinuerContinuousFractions::setEnergyInfinitesimal(
    double energyInfinitesimal
){
    this->energyInfinitesimal = energyInfinitesimal;
}
 
};  //End of namespace Solver
};  //End of namespace TBTK
 
#endif