Influence of interface roughness in quantum cascade lasers

We use a numerical model based on non-equilibrium Green's functions to investigate the influence of interface roughness (IFR) scattering in terahertz quantum cascade lasers. We confirm that IFR is an important phenomenon that affects both current and gain. The simulations indicate that IFR causes a leakage current that transfers electrons from the upper to the lower laser state. In certain cases, this current can greatly reduce gain. In addition, individual interfaces and their impact on the renormalized single particle energies are studied and shown to give both blue-and red-shifts of the gain spectrum. (C) 2015 AIP Publishing LLC.

Winge, DavidLund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)teor-dwn (author)
Franckie, MartinLund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)teor-mln (author)
Wacker, AndreasLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fysi-awa (author)
Lund UniversityMatematisk fysik (creator_code:org_t)

By the author/editor: Krivas, K. A.; Winge, David; Franckie, Martin; Wacker, Andreas

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