New many-particle system consisting of electron pairs and holes in a two-dimensional crystal
| Autor: | Hai, Guo-Qiang, Cândido, Ladir |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | When atoms are organized into a crystal, the single-electron energy levels of individual atoms form energy bands. However, there also exist electron-pair states in atoms. We found previously that the counterpart of these electron-pair states of individual atoms may survive in a two-dimensional square-lattice crystal. When the amplitude of the crystal potential is larger than a certain value, a metastable electron-pair band arises between the two lowest single-electron energy bands. In this paper, we demonstrate that the many-particle exchange-correlation corrections renormalize the energy bands and may stabilize the electron pairs for certain hole and electron-pair densities in the two-dimensional crystal. Therefore, depending upon the crystal potential and free carrier densities, there may exist a new many-particle system consisting of electron pairs and holes. Furthermore, we calculate the charge-density excitation spectrum in this new many-particle system. Comment: In this manuscript, we dealt with a system with holes in a single-electron band interacting with electron pairs. We found that the way we introduced the hole states was inaccurate. We recommend arXiv:1802.06593 for a system with single electrons and electron pairs |
| Databáze: | arXiv |
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