Lattice-Induced Forces between Excitons
- 28 October 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 33 (18) , 1092-1094
- https://doi.org/10.1103/physrevlett.33.1092
Abstract
I consider the effects of the lattice on the total energy of a low-density exciton system. While only a weak attraction is contributed by acoustical-phonon coupling, polar optical phonons are found to cause a rather strong repulsion between the excitons, i.e., they increase the total energy. These lattice-induced terms provide a cancelation of the otherwise attractive forces. For intermediate or strong electron-phonon coupling, they can turn the total average exciton-exciton force into a repulsive one.Keywords
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