Influence of exciton-exciton interaction with spin paired charge carriers and exciton-lattice interaction on the surface properties of crystalline solids |
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Authors: | J Singh N Itoh V V Truong |
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Institution: | (1) Research School, Faculty of Science, Northern Territory University, P.O. Box 40146, N.T. 0811 Casuarina, Australia;(2) Department of Physics, Faculty of Science, Nagoya University, Furocho Chikusaku, 464 Nagoya, Japan;(3) Department of Physics, Universite de Moncton, E1A 3E9, New-Brunswick, Canada |
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Abstract: | Applying tight-binding approximation and spin pairing of like charge carriers in a pair of excitons created in a lattice, the possibility of forming a bound exciton-exciton state is studied. It is found that, provided there exists strong exciton-lattice interaction, such a bound state may be formed and its energy may lie within the valence band deforming the material into a crystalline solid with no energy gap. Lowering of the energy is calculated in naphthalene and anthracene crystals where some experimental results are known. The excess energy released after the formation of such bound state can be adequate, depending on the material, to desorb neutral atoms or eject of electrons from surfaces. |
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Keywords: | 71 35 +z 73 90 + f |
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