Intersubband terahertz transitions in Landau level system of cascade GaAs/AlGaAs quantum well structures in strong tilted magnetic field
1 Solid State Physics Dept., P.N.Lebedev Physical Institute, Moscow 119991, Russia
2 Theoretical Physics and Quantum Technologies Dept., Moscow Institute for Steel and Alloys, Moscow 119049, Russia
3 National Research Nuclear Center MEPHI, Moscow 115409, Russia
Nanoscale Research Letters 2012, 7:491 doi:10.1186/1556-276X-7-491Published: 31 August 2012
The tunable terahertz intersubband Landau level transitions in resonant tunneling cascade quantum well structures are considered. The way of lifting the selection rule forbidding the inter-Landau level terahertz transitions of interest by applying a magnetic field tilted with respect to the structure layers is proposed. The importance of asymmetric structure design to achieve considerable values of transition dipole matrix elements is demonstrated.