Room-temperature Bloch oscillations and interminiband Zener tunneling in a GaAs-based narrow-minigap superlattice. (14th July 2021)

• Record Type: Journal Article
• Authors: Unuma, Takeya; Itagaki, Yuto; Asakura, Soichiro
• Is Part Of: Applied physics express. Volume 14:Number 8(2021)
• Publication Date: 2021-07-14
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/ac114f
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We investigate peculiar Bloch oscillations and interminiband Zener tunneling in a GaAs-based narrow-minigap superlattice up to room temperature, by using terahertz emission spectroscopy under dc bias electric fields. The Bloch oscillations observed previously with a π /2 phase shift at 10 K under relatively low bias fields are found to survive even at 300 K, where thermal energy kT exceeds the relevant minigap ( k : Boltzmann constant, T : temperature). Furthermore, the interminiband Zener tunneling under high bias fields leads to a monocyclic terahertz signal with a temperature-dependent subsequent bumpy tail, indicating its occurrence at a few different occasions for Bloch oscillating electrons.