Abstract-Temperature-dependent spectral linewidths of terahertz Bloch oscillations in biased semiconductor superlattices

Takeya Unuma, Aleph Matsuda,

https://www.researchgate.net/publication/324627887_Temperature-dependent_spectral_linewidths_of_terahertz_Bloch_oscillations_in_biased_semiconductor_superlattices

We investigate temperature-dependent spectral linewidths of Bloch oscillations in biased semiconductor superlattices experimentally and theoretically. The spectral linewidth in a GaAs-based superlattice determined by terahertz emission spectroscopy becomes larger gradually as temperature increases from 80 to 320 K. This behavior can be quantitatively reproduced by a microscopic theory of the spectral linewidth that has been extended to treat the phonon scattering and interface roughness scattering of electrons on a Wannier-Stark ladder. A detailed comparison between the terahertz measurements and theoretical simulations reveals that the LO phonon absorption process governs the increase in the spectral linewidth with increasing temperature.