Importance of electron-impurity scattering for electron transport in terahertz quantum-cascade lasers

被引：102

作者：

Callebaut, H ^{[1
]}

Kumar, S

Williams, BS

Hu, Q

Reno, JL

机构：

[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[3] Sandia Natl Labs, Dept 1123, Albuquerque, NM 87185 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 05期

关键词：

D O I：

10.1063/1.1644337

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using an ensemble Monte Carlo simulation, including both electron-electron and electron-phonon scattering as well as electron-impurity scattering, the current density, population inversion, electron temperature, and gain in two THz quantum-cascade structures are investigated and compared to measurements. We find that the inclusion of electron-impurity scattering in the calculations is crucial when modeling the intersubband transport dynamics in these devices. However, the calculated gain is higher than inferred from experiments. This can be attributed to wavefunction localization caused by dephasing scattering, which is unaccounted for in the present model.(C) 2004 American Institute of Physics.

引用

页码：645 / 647

页数：3

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