SelfEnergy.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_SOLVER_SELF_ENERGY
#define COM_DAFER45_TBTK_SOLVER_SELF_ENERGY
 
#include "TBTK/BrillouinZone.h"
#include "TBTK/IndexedDataTree.h"
#include "TBTK/Property/InteractionVertex.h"
#include "TBTK/RPA/MomentumSpaceContext.h"
#include "TBTK/Solver/Solver.h"
 
namespace TBTK{
namespace Solver{
 
class SelfEnergy : public Solver{
public:
    SelfEnergy(
        const RPA::MomentumSpaceContext &momentumSpaceContext,
        const Property::InteractionVertex &interactionVertex
    );
 
    ~SelfEnergy();
 
    const RPA::MomentumSpaceContext& getMomentumSpaceContext() const;
 
    const Property::InteractionVertex& getInteractionVertex() const;
 
    void init();
 
    std::vector<std::complex<double>> calculateSelfEnergy(
        const Index &index,
        const std::vector<std::complex<double>> &energies
    );
 
    std::vector<std::complex<double>> calculateSelfEnergySelfConsistently(
        unsigned int numMatsubaraFrequencies,
        const std::vector<std::complex<double>> &energies
    );
private:
    const RPA::MomentumSpaceContext &momentumSpaceContext;
 
    const Property::InteractionVertex &interactionVertex;
 
    int *kMinusQLookupTable;
 
    void generateKMinusQLookupTable();
 
    template<bool useKPlusKLookupTable>
    int getKMinusQLinearIndex(
        unsigned int meshIndex,
        const std::vector<double> &k,
        int kLinearIndex
    ) const;
 
    bool isInitialized;
 
    template<bool singleSelfEnergyEnergy>
    void selfEnergyMainLoop(
        const Index &index,
        const std::vector<std::complex<double>> &energies,
        std::vector<std::complex<double>> &result
    );
};
 
inline const RPA::MomentumSpaceContext& SelfEnergy::getMomentumSpaceContext(
) const{
    return momentumSpaceContext;
}
 
inline const Property::InteractionVertex& SelfEnergy::getInteractionVertex(
) const{
    return interactionVertex;
}
 
};  //End of namespace Solver
};  //End of namespace TBTK
 
#endif