ZFactorCalculator.h

/* Copyright 2017 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_Z_FACTOR_CALCULATOR
#define COM_DAFER45_TBTK_Z_FACTOR_CALCULATOR

#include "TBTK/BrillouinZone.h"
#include "TBTK/IndexedDataTree.h"
#include "TBTK/RPA/SelfEnergyCalculator.h"

namespace TBTK{

class ZFactorCalculator{
public:
    ZFactorCalculator(
        const RPA::MomentumSpaceContext &momentumSpaceContext,
        unsigned int numWorkers = 1
    );

    ~ZFactorCalculator();

    void setNumSummationEnergies(unsigned int numSummationEnergies);

    void init();

    std::vector<std::complex<double>> calculateZFactor(
        const std::vector<double> &k
    );

/*  std::vector<std::complex<double>> calculateZFactor2(
        const std::vector<double> &k
    );*/

    void setU(std::complex<double> U);

    void setUp(std::complex<double> Up);

    void setJ(std::complex<double> J);

    void setJp(std::complex<double> Jp);

//  void precomputeSusceptibilities(unsigned int numWorkers = 128);

    void saveSusceptibilities(const std::string &filename) const;

    void loadSusceptibilities(const std::string &filename);
private:
    SelfEnergyCalculator selfEnergyCalculator;

    unsigned int numSummationEnergies;

    bool isInitialized;

    void invertMatrix(
        std::complex<double> *matrix,
        unsigned int dimensions
    );

    void multiplyMatrices(
        std::complex<double> *matrix1,
        std::complex<double> *matrix2,
        std::complex<double> *result,
        unsigned int dimensions
    );

    void printMatrix(
        std::complex<double> *matrix,
        unsigned int dimensions
    );

    std::complex<double> U, Up, J, Jp;
};

inline void ZFactorCalculator::setNumSummationEnergies(
    unsigned int numSummationEnergies
){
    this->numSummationEnergies = numSummationEnergies;
}

inline void ZFactorCalculator::setU(std::complex<double> U){
    this->U = U;
    selfEnergyCalculator.setU(U);
}

inline void ZFactorCalculator::setUp(std::complex<double> Up){
    this->Up = Up;
    selfEnergyCalculator.setUp(Up);
}

inline void ZFactorCalculator::setJ(std::complex<double> J){
    this->J = J;
    selfEnergyCalculator.setJ(J);
}

inline void ZFactorCalculator::setJp(std::complex<double> Jp){
    this->Jp = Jp;
    selfEnergyCalculator.setJp(Jp);
}

/*inline void ZFactorCalculator::precomputeSusceptibilities(
    unsigned int numWorkers
){
    selfEnergyCalculator.precomputeSusceptibilities(numWorkers);
}*/

inline void ZFactorCalculator::saveSusceptibilities(
    const std::string &filename
) const{
    selfEnergyCalculator.saveSusceptibilities(filename);
}

inline void ZFactorCalculator::loadSusceptibilities(
    const std::string &filename
){
    selfEnergyCalculator.loadSusceptibilities(filename);
}

};  //End of namespace TBTK

#endif