Excitonics
Excitonics is a subfield of condensed-matter physics and device engineering that studies excitons—bound states of electrons and holes—and their use for information processing, energy transport and light–matter interactions. Excitons behave as charge-neutral quasiparticles with characteristic binding energy, size and lifetime determined by the host material and dimensionality. Two common types are Wannier–Mott excitons (large-radius, weakly bound, typical in inorganic semiconductors and quantum wells) and Frenkel excitons (tightly bound, common in organic crystals and molecular solids).
Research in excitonics covers exciton generation, transport, scattering, recombination and conversion to free charges or photons.
Experimental methods include photoluminescence, ultrafast pump–probe spectroscopy, transient absorption and near-field imaging. Theoretical approaches employ many-body