DipoleOrientation.cpp

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 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#include "applications/staticProps/DipoleOrientation.hpp"
 
#include <string>
#include <vector>
 
#include "applications/staticProps/SpatialStatistics.hpp"
#include "brains/SimInfo.hpp"
#include "math/SquareMatrix3.hpp"
#include "math/Vector3.hpp"
#include "primitives/StuntDouble.hpp"
#include "utils/Accumulator.hpp"
#include "utils/AccumulatorView.hpp"
#include "utils/BaseAccumulator.hpp"
#include "utils/StringUtils.hpp"
 
using namespace OpenMD::Utils;
 
namespace OpenMD {
 
  DipoleOrientation::DipoleOrientation(
      SimInfo* info, const std::string& filename, const std::string& sele,
      const RealType dipoleX, const RealType dipoleY, const RealType dipoleZ,
      int nzbins, int axis) :
      SlabStatistics(info, filename, sele, nzbins, axis),
      axis_(axis) {
    switch (axis_) {
    case 0:
      axisLabel_ = "x";
      refAxis_   = Vector3d(1, 0, 0);
      break;
    case 1:
      axisLabel_ = "y";
      refAxis_   = Vector3d(0, 1, 0);
      break;
    case 2:
    default:
      axisLabel_ = "z";
      refAxis_   = Vector3d(0, 0, 1);
      break;
    }
    setOutputName(getPrefix(filename) + ".Sz");
 
    dipoleVector_ = Vector3d(dipoleX, dipoleY, dipoleZ);
    dipoleVector_.normalize();
 
    // Pre-load the OutputData
    data_.resize(DipoleOrientation::ENDINDEX);
 
    OutputData z;
    z.units        = "Angstroms";
    z.title        = axisLabel_;
    z.dataHandling = DataHandling::Average;
    for (unsigned int i = 0; i < nBins_; i++)
      z.accumulator.push_back(
          std::make_unique<AccumulatorView<RealAccumulator>>());
    data_[Z] = std::move(z);
 
    OutputData orderS;
    orderS.units        = "";
    orderS.title        = "Orientational Order parameter";
    orderS.dataHandling = DataHandling::Average;
    for (unsigned int i = 0; i < nBins_; i++)
      orderS.accumulator.push_back(
          std::make_unique<AccumulatorView<RealAccumulator>>());
    data_[ORDERS] = std::move(orderS);
 
    OutputData orderSCos;
    orderSCos.units        = "";
    orderSCos.title        = "Orientational Order parameter cosine Theta";
    orderSCos.dataHandling = DataHandling::Average;
    for (unsigned int i = 0; i < nBins_; i++)
      orderSCos.accumulator.push_back(
          std::make_unique<AccumulatorView<RealAccumulator>>());
    data_[ORDERSCOS] = std::move(orderSCos);
  }
 
  void DipoleOrientation::processFrame(int) {
    RealType z;
 
    hmat_ = currentSnapshot_->getHmat();
 
    for (unsigned int i = 0; i < nBins_; i++) {
      z = (((RealType)i + 0.5) / (RealType)nBins_) * hmat_(axis_, axis_);
      data_[Z].accumulator[i]->add(z);
    }
 
    volume_ = currentSnapshot_->getVolume();
 
    StuntDouble* sd;
    int i;
 
    std::vector<RealType> binS(nBins_, 0.0);
    std::vector<RealType> binSCos(nBins_, 0.0);
 
    std::vector<int> count(nBins_, 0.0);
 
    if (evaluator_.isDynamic()) {
      seleMan_.setSelectionSet(evaluator_.evaluate());
    }
 
    // loop over the selected atoms:
    SquareMatrix3<RealType> rotMat;
    Vector3d rotatedDipoleVector;
    RealType ctheta;
    RealType orderParameter;
 
    for (sd = seleMan_.beginSelected(i); sd != NULL;
         sd = seleMan_.nextSelected(i)) {
      // figure out where that object is:
      Vector3d pos = sd->getPos();
 
      int bin = getBin(pos);
 
      if (sd->isDirectional() || sd->isRigidBody()) {
        rotMat              = sd->getA();
        rotatedDipoleVector = rotMat * dipoleVector_;
        rotatedDipoleVector.normalize();
        ctheta = dot(rotatedDipoleVector, refAxis_);
 
        orderParameter = (3 * (ctheta * ctheta) - 1) / 2;
 
        binS[bin] += orderParameter;
        binSCos[bin] += ctheta;
 
        count[bin] += 1;
      }
    }
 
    for (unsigned int i = 0; i < nBins_; i++) {
      count[i] != 0 ? data_[ORDERS].accumulator[i]->add(binS[i] / count[i]) :
                      data_[ORDERS].accumulator[i]->add(binS[i]);
      count[i] != 0 ?
          data_[ORDERSCOS].accumulator[i]->add(binSCos[i] / count[i]) :
          data_[ORDERSCOS].accumulator[i]->add(binSCos[i]);
    }
  }
}  // namespace OpenMD