Author(s): Huang, YW (Huang, YongWei); Shi, LK (Shi, Likun); Li, J (Li, Jun); Lou, WK (Lou, WenKai); Yuan, HH (Yuan, HuiHong); Yang, W (Yang, Wen); Chang, K (Chang, Kai)

Source: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY Volume: 64 Issue: 1 Article Number: 217211 DOI: 10.1007/s11433-020-1604-2 Published: JAN 2021

Abstract: 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 similar to 50%. This study may promote the usage of topological insulator quantum dots as an important source of THz radiation.

Accession Number: WOS:000593109400001

ISSN: 1674-7348

eISSN: 1869-1927

Full Text: https://link.springer.com/journal/11433/volumes-and-issues/64-1