Song, J. W, N. A Kabir, Y.  Kawano, K.  Ishibashi, G. R Aizin, L.  Mourokh, J. L Reno, A. G Markelz, and J. P Bird. ?Terahertz Response Of Quantum Point Contacts?. Applied Physics Lettersapplied Physics Lettersapplied Physics Letters 92 (2008): 3. doi:https://doi.org/10.1063/1.2938416.

Kabir, N. A, Y.  Yoon, J. R Knab, J. Y Chen, A. G Markelz, J. L Reno, Y.  Sadofyev, S.  Johnson, Y. H Zhang, and J. P Bird. ?Terahertz Transmission Characteristics Of High-Mobility Gaas And Inas Two-Dimensional-Electron-Gas Systems?. Applied Physics Letters 89 (2006): 3. doi:10.1063/1.2357605.