MatsubaraSusceptibility.h

/* Copyright 2018 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_MATSUBARA_SUSCEPTIBILITY
#define COM_DAFER45_TBTK_SOLVER_MATSUBARA_SUSCEPTIBILITY

#include "TBTK/Communicator.h"
#include "TBTK/Property/GreensFunction.h"
#include "TBTK/MomentumSpaceContext.h"
#include "TBTK/Property/Susceptibility.h"
#include "TBTK/Solver/Solver.h"

#include <complex>

namespace TBTK{
namespace Solver{

class MatsubaraSusceptibility : public Solver, public Communicator{
public:
    MatsubaraSusceptibility(
        const MomentumSpaceContext &momentumSpaceContext,
        const Property::GreensFunction &greensFunction
    );

    virtual MatsubaraSusceptibility* createSlave();

    virtual std::vector<std::complex<double>> calculateSusceptibility(
        const Index &index,
        const std::vector<std::complex<double>> &energies
    );

    std::vector<std::complex<double>> calculateSusceptibility(
        const Index &index,
        int lowerMatsubaraEnergyIndex,
        int upperMatsubaraEnergyIndex
    );

    Property::Susceptibility calculateSusceptibilityAllBlocks(
        const Index &index,
        int lowerMatsubaraEnergyIndex,
        int upperMatsubaraEnergyIndex
    );

    const Property::GreensFunction& getGreensFunction() const;
private:
    const Property::GreensFunction &greensFunction;

    const MomentumSpaceContext &momentumSpaceContext;
};

inline const Property::GreensFunction&
MatsubaraSusceptibility::getGreensFunction() const{
    return greensFunction;
}

};  //End of namespace Solver
};  //End of namespace TBTK

#endif