Electrically pumped terahertz laser based on a topological insulator quantum dot array

• 作者: YongWei Huang LiKun Shi Jun Li WenKai Lou HuiHong Yuan Wen Yang Kai Chang
• 来源期刊: 中国科学：物理学 力学 天文学（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Article
• 页码范围: 82-90
• 页数: 9页
• 语种: 英文

摘要

The energy level separation between the edge states in topological insulator quantum dots lies in the terahertz(THz)range.Quantum confinement ensures the nonuniformity of the energy level separation near the Dirac point.Based on these features,we propose that a topological insulator quantum dot array can be operated as an electrically pumped continuous-wave THz laser.The proposed device can operate at room temperature,with power exceeding 10 mW and quantum efficiency reaching～50％.This study may promote the usage of topological insulator quantum dots as an important source of THz radiation.