AN EFFECTIVE TWO-LEVEL CHANNEL FOR AN IMPURITY IN A SUPERLATTICE

• 来源期刊: 中国物理(英文版)
• 学科: 物理学
• 关键词: localization avoided crossing
• 年，卷（期）: 2001,（6）
• 页码范围: 537-540
• 页数: 4页
• 分类号: O4
• 语种: 英文

摘要

The eigenstates and eigenspectrum of a charged particle in a one-dimensional semiconductor superlattice with animpurity under the action of a dc electric field are investigated employing the single-and tight-binding model. We find that the system undergoes a series of avoided crossings, at which resonant oscillations between the impurity and its nearest neighbour occur if appropriate conditions are met, suggesting an effective two-level approximation. This phenomenon shows that introducing an impurity in a perfect lattice provides a promising structure for the observation of terahertz radiation.