Novel trion states in low-density -hole system with complex valence band structure
Max-Planck-Institut für Festkörperforschung
Heisenbergstr. 1, 70569 Stuttgart, Germany
2 Institute of Solid State Physics, RAS - Chernogolovka, 142432 Russia
Accepted: 14 February 2000
Photoluminescence signature of positively charged excitons in GaAs/AlGaAs quantum well is studied both experimentally and theoretically. For the first time we have observed the formation of a mixed light- and heavy-hole complex as well as the light-hole triplet state. It is shown that the complex of mixed type becomes the system ground state in sufficiently large magnetic fields. The effect of positively charged exciton ionization induced by an external electric field is studied for singlet and triplet states in a wide range of magnetic field. The experimental results agree well with theoretical calculations based on the Luttinger Hamiltonian.
PACS: 78.55.Cr – III V semiconductors / 78.66.Fd – III V semiconductors / 71.35.Ji – Excitons in magnetic fields; magnetoexcitons
© EDP Sciences, 2000