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 10K 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.

我们通过在直流偏置电场下使用太赫兹发射光谱研究了室温下基于 GaAs 的窄小间隙超晶格中的特殊 Bloch 振荡和小带间齐纳隧穿。先前观察到的布洛赫振荡在相对低的偏置场下在 10K 时具有π /2 相移，即使在 300K 时也能存活，其中热能kT超过相关的小间隙（k：玻尔兹曼常数，T：温度）。此外，高偏压场下的小带间齐纳隧穿导致单环太赫兹信号具有随后的温度依赖性颠簸尾部，表明它在布洛赫振荡电子的几个不同场合出现。