Intersubband optical absorption in InSb stepped quantum wells: Effect of spin sublevels crossing |
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| Institution: | 1. Departamento de Física, Universidad de La Laguna, La Laguna, 38206 Tenerife, Spain;2. Instituto Universitario de Estudios Avanzados (IUdEA) en Física Atómica, Molecular y Fotónica, Universidad de La Laguna, La Laguna, 38206 Tenerife, Spain;1. Department of Physics, Shahid Rajaee Teacher Training University, Lavizan, 16788-15811 Tehran, Iran;2. Department of Chemistry, Shahid Rajaee Teacher Training University, Lavizan, 16788-15811 Tehran, Iran;1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China;2. College of Physics and Electronic Engineering, Qilu Normal University, Jinan 250013, PR China;3. School of Space Science and Physics, Shandong University, Weihai 264209, PR China;1. State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System, National University of Defense Technology (NUDT), Changsha 410073, China;2. Center for Optical and Electromagnetic Research, State Key Lab of MOI, Zhejiang University, Hangzhou 310058, China |
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| Abstract: | We study linear and non-linear coefficients of the intersubband absorption in InSb-based stepped quantum wells subjected to an in-plane magnetic field. We consider also a transverse electric field to achieve near resonance conditions. Taking into account the two deepest conduction levels and their corresponding Zeeman spin splitting sublevels, we calculate dispersion relations by means of an improved version of Kane model. Besides the known anti-crossing between down and up spin split sublevels, we obtain an extra spin level crossing for some determined parameters. This crossing clearly modifies the absorption spectrum for transitions among the four sublevels considered. We study a low electron density case, when only the first deepest sublevel is occupied, and a high density case with only the highest sublevel empty. We find a similar behavior of the absorption spectrum in both cases. |
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| Keywords: | Spin intersubband transitions Quantum well Nonlinear optical absorption |
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