1. Department of Physics, Chemistry and Biology (IFM)Linköping University S-581 83 Linköping Sweden
2. Laboratory of NanoelectronicsSt-Petersburg Academic University Khlopina 8/3 194021 St. Petersburg Russian Federation
3. School of PhotonicsITMO University Kronverkskiy pr. 49 197101 St. Petersburg Russian Federation
4. Centre of Nanoheterostructure PhysicsIoffe Institute Politekhnicheskaya 26 194021 St. Petersburg Russian Federation