Electrically pumped terahertz laser based on a topological insulator quantum dot

本文刊于: 《Science China(Physics,Mechanics & Astronomy)》 2021年第0期

关键词:
terahertz topologicalinsulator quantumdo

Keywords:
terahertz,topological insulator,quantum dot,and quantum confinement effect
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.

基金项目:
supportedbytheStrategicPriorityResearchProgramoftheChineseAcademyofSciences(GrantNo.XDB28000000);theNationalNaturalScienceFoundationofChina(GrantNos.61674145,11974340,11434010,11574303,and11774021);theMinistryofScienceandTechnologyofthePeople’sRepublicofC

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