二维晶体中由电子对和空穴组成的新多粒子系统
New many-particle system consisting of electron pairs and holes in a two-dimensional crystal
摘要：
当原子被组织成晶体时，单个原子的单电子能级形成能带。然而，原子中也存在电子对态。我们以前发现，这些电子对状态的个别原子的对应物可以生存在一个二维的正方形晶格晶体。当晶体势的幅值大于某一值时，在两个最低的单电子能带之间会出现一个亚稳电子对带。在本文中，我们证明了多粒子交换关联修正重整化的能带，并可能稳定的电子对一定的空穴和电子对密度的二维晶体。因此，依赖于晶体势和自由载流子密度，可能存在由电子对和空穴组成的新的多粒子系统。此外，我们还计算了这个新的多粒子系统的电荷密度激发谱。
英文摘要：
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.
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