Negative circular polarization dynamics in InP/InGaP quantum dots

3rd International School and Conference on Optoelectronics, Photonics, Engineering and Nanostructures (Saint Petersburg OPEN 2016)

Nekrasov, S.V.^1 ; Kusrayev, Yu G.^1 ; Akimov, I.A.^1,2 ; Korenev, V.L.^1,2 ; Langer, L.^2 ; Salewski, M.^2

Optics of Semiconductors Lab., Ioffe Institute RAS, Saint Petersburg

194021, Russia^1

Experimentelle Physik 2, Technische Universität Dortmund, Dortmund

D-44227, Germany^2

关键词: Bulk materials;    Electron spins;    Excitation lasers;    Low dimensional;    Luminescence polarization;    Magnetic field behavior;    Time resolved measurement;    Transverse magnetic field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/741/1/012189/pdf
DOI  :  10.1088/1742-6596/741/1/012189

来源: IOP

【 摘 要 】

Photoluminescence (PL) negative circular polarization (NCP) dynamics of InP/InGaP quantum dots (QDs) was studied. Time resolved measurements of PL demonstrated that NCP vanishes, when transverse magnetic field is applied, while oscillations of polarization (that are typical for both low-dimensional and bulk materials) do not occur. Hole g-factor spread in the QD ensemble was supposed to be the most probable reason for such NCP magnetic field behavior. The dependence of NCP dynamics on the repetition period of excitation laser pulses was investigated. In case of fairly small repetition period (T = 13.3 ns) long living NCP (13.3 ns