Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Exciton> ?p ?o }
- Exciton abstract "An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and in some liquids. The exciton is regarded as an elementary excitation of condensed matter that can transport energy without transporting net electric charge.An exciton can form when a photon is absorbed by a semiconductor. This excites an electron from the valence band into the conduction band. In turn, this leaves behind a positively charged electron hole (an abstraction for the location from which an electron was moved). The electron in the conduction band is then effectively attracted to this localized hole by the repulsive Coulomb forces from large numbers of electrons surrounding the hole and excited electron. This attraction provides a stabilizing energy balance. Consequently, the exciton has slightly less energy than the unbound electron and hole. The wavefunction of the bound state is said to be hydrogenic, an exotic atom state akin to that of a hydrogen atom. However, the binding energy is much smaller and the particle's size much larger than a hydrogen atom. This is because of both the screening of the Coulomb force by other electrons in the semiconductor (i.e., its dielectric constant), and the small effective masses of the excited electron and hole. The recombination of the electron and hole, i.e. the decay of the exciton, is limited by resonance stabilization due to the overlap of the electron and hole wave functions, resulting in an extended lifetime for the exciton.The electron and hole may have either parallel or anti-parallel spins. The spins are coupled by the exchange interaction, giving rise to exciton fine structure. In periodic lattices, the properties of an exciton show momentum (k-vector) dependence.The concept of excitons was first proposed by Yakov Frenkel in 1931, when he described the excitation of atoms in a lattice of insulators. He proposed that this excited state would be able to travel in a particle-like fashion through the lattice without the net transfer of charge.".
- Exciton thumbnail Exciton.png?width=300.
- Exciton wikiPageID "43597".
- Exciton wikiPageLength "17987".
- Exciton wikiPageOutDegree "74".
- Exciton wikiPageRevisionID "682198255".
- Exciton wikiPageWikiLink Anthracene.
- Exciton wikiPageWikiLink Antonina_Prikhotko.
- Exciton wikiPageWikiLink Atom.
- Exciton wikiPageWikiLink Band_gap.
- Exciton wikiPageWikiLink Biexciton.
- Exciton wikiPageWikiLink Binding_energy.
- Exciton wikiPageWikiLink Boltzmann_constant.
- Exciton wikiPageWikiLink Bose–Einstein_condensate.
- Exciton wikiPageWikiLink Boson.
- Exciton wikiPageWikiLink Bosons.
- Exciton wikiPageWikiLink Bound_state.
- Exciton wikiPageWikiLink Carbon_nanotube.
- Exciton wikiPageWikiLink Carbon_nanotubes.
- Exciton wikiPageWikiLink Carrier_generation_and_recombination.
- Exciton wikiPageWikiLink Category:Condensed_matter_physics.
- Exciton wikiPageWikiLink Category:Quasiparticles.
- Exciton wikiPageWikiLink Condensed_matter.
- Exciton wikiPageWikiLink Condensed_matter_physics.
- Exciton wikiPageWikiLink Conduction_band.
- Exciton wikiPageWikiLink Coulomb_force.
- Exciton wikiPageWikiLink Coulombs_law.
- Exciton wikiPageWikiLink Crystal_momentum.
- Exciton wikiPageWikiLink Dielectric_constant.
- Exciton wikiPageWikiLink Effective_mass_(solid-state_physics).
- Exciton wikiPageWikiLink Electric-field_screening.
- Exciton wikiPageWikiLink Electric_dipole_moment.
- Exciton wikiPageWikiLink Electric_field_screening.
- Exciton wikiPageWikiLink Electrical_insulation.
- Exciton wikiPageWikiLink Electron.
- Exciton wikiPageWikiLink Electron_hole.
- Exciton wikiPageWikiLink Electron_volt.
- Exciton wikiPageWikiLink Electronvolt.
- Exciton wikiPageWikiLink Exchange_interaction.
- Exciton wikiPageWikiLink Exotic_atom.
- Exciton wikiPageWikiLink Femtosecond.
- Exciton wikiPageWikiLink Fine_structure.
- Exciton wikiPageWikiLink Fullerene.
- Exciton wikiPageWikiLink Förster_resonance_energy_transfer.
- Exciton wikiPageWikiLink Giant_oscillator_strength.
- Exciton wikiPageWikiLink Gregory_Wannier.
- Exciton wikiPageWikiLink LUMO.
- Exciton wikiPageWikiLink Hydrogen.
- Exciton wikiPageWikiLink Hydrogen-like_atom.
- Exciton wikiPageWikiLink Hydrogen_spectral_series.
- Exciton wikiPageWikiLink Instanton.
- Exciton wikiPageWikiLink Insulator_(electricity).
- Exciton wikiPageWikiLink Ion.
- Exciton wikiPageWikiLink Light_emission.
- Exciton wikiPageWikiLink List_of_light_sources.
- Exciton wikiPageWikiLink Molecular_orbital.
- Exciton wikiPageWikiLink Molecule.
- Exciton wikiPageWikiLink Nanosecond.
- Exciton wikiPageWikiLink Nanoseconds.
- Exciton wikiPageWikiLink Nevill_Francis_Mott.
- Exciton wikiPageWikiLink Oscillator_strength.
- Exciton wikiPageWikiLink Phonon.
- Exciton wikiPageWikiLink Photon.
- Exciton wikiPageWikiLink Polariton.
- Exciton wikiPageWikiLink Polariton_superfluid.
- Exciton wikiPageWikiLink Polaron.
- Exciton wikiPageWikiLink Quasiparticle.
- Exciton wikiPageWikiLink Relative_permittivity.
- Exciton wikiPageWikiLink Semiconductor.
- Exciton wikiPageWikiLink Spin_(physics).
- Exciton wikiPageWikiLink Temperature.
- Exciton wikiPageWikiLink Tetracene.
- Exciton wikiPageWikiLink Valence_and_conduction_bands.
- Exciton wikiPageWikiLink Valence_band.
- Exciton wikiPageWikiLink Wave_function.
- Exciton wikiPageWikiLink Wavefunction.
- Exciton wikiPageWikiLink Xenon.
- Exciton wikiPageWikiLink Yakov_Frenkel.
- Exciton wikiPageWikiLink File:Exciton.png.
- Exciton wikiPageWikiLink File:Moving_Wannier_exciton.svg.
- Exciton wikiPageWikiLinkText "Exciton".
- Exciton wikiPageWikiLinkText "Frenkel excitons".
- Exciton wikiPageWikiLinkText "Wannier exciton".
- Exciton wikiPageWikiLinkText "bound core excitons".
- Exciton wikiPageWikiLinkText "correlated electron–hole".
- Exciton wikiPageWikiLinkText "exciton".
- Exciton wikiPageWikiLinkText "excitonic condensation".
- Exciton wikiPageWikiLinkText "hole-electron pair".
- Exciton wikiPageWikiLinkText "transfer of excitation energy".
- Exciton hasPhotoCollection Exciton.
- Exciton wikiPageUsesTemplate Template:Condensed_matter_physics.
- Exciton wikiPageUsesTemplate Template:Expand_section.
- Exciton wikiPageUsesTemplate Template:Gaps.
- Exciton wikiPageUsesTemplate Template:Particles.
- Exciton wikiPageUsesTemplate Template:Refimprove.
- Exciton wikiPageUsesTemplate Template:Reflist.
- Exciton subject Category:Condensed_matter_physics.
- Exciton subject Category:Quasiparticles.
- Exciton hypernym State.
- Exciton type PopulatedPlace.