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

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.

发文机构：State Key Laboratory for Superlattices and Microstructures CAS Center for Excellence in Topological Quantum Computation Department of Physics Beijing Academy of Quantum Information Sciences Beijing Computational Science Research Center

关键词：TERAHERTZtopologicalinsulatorquantumdotandquantumconfinementeffect

分类号： TN2[电子电信—物理电子学]