Charge conversion of nearly free and impurity bound magneto-trions immersed in 2D electron or hole gas with optically tunable concentration

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Jadczak, J.^1 ; Bryja, L.^1 ; Misiewicz, J.^1 ; Wójs, A.^1 ; Potemski, M.^2 ; Liu, F.^3 ; Yakovlev, D.R.^3 ; Bayer, M.^3 ; Reuter, D.^4 ; Wieck, A.D.^4 ; Nicoll, C.A.^5 ; Farrer, I.^5 ; Ritchie, D.A.^5

Institute of Physics, Wroclaw University of Technology, 50-370 Wroclaw, Poland^1

Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 38042 Grenoble, France^2

Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany^3

Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany^4

Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom^5

关键词: D electrons;    Emission intensity;    Excitonic complexes;    Field evolution;    Photon energy;    Recombination lines;    Reflection symmetry;    Two beams;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012017/pdf
DOI  :  10.1088/1742-6596/456/1/012017

来源: IOP

【 摘 要 】

We report collection of precise photoluminescence maps (emission intensity versus energy and magnetic field) of superior-quality two-dimensional hole gases. The maps reveal field evolution of both direct and cyclotron-assisted recombination lines attributed to various excitonic complexes, either moving nearly freely in the plane or bound to the acceptors placed inside or outside the quantum well. Under two-beam illumination (with photon energies below and above the band-gap in the barrier) we were able to control hole concentration (in the same well), and in particular to decrease it beyond the point of p- to n-type conversion. Our results demonstrate contrast between charge conversion of free and acceptor-bound positive trions resulting from the breaking of charge reflection symmetry by a fixed impurity.