Spatial diffusion of excitons in n-type modulation-doped (Cd,Mn)Te/(Cd,Mg)Te single quantum wells under magnetic fields

Takano, Fumiyoshi; Akinaga, Hiro; Tokizaki, Takashi; Kuroda, Shinji; Takita, Kôki
October 2003
Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2853
Academic Journal
Time-resolved and spatially resolved photoluminescence (PL) measurements were performed on the (Cd,Mn)Te-based two-dimensional (2D) electron gas system at 4.2 K under magnetic fields up to 0.5 T. The detailed characteristics of the PL spatial extent under these magnetic fields were strongly dependent upon the intrinsic 2D carrier density. We found that, in the lower carrier density sample, the PL spatial extent increased with an increase in the magnetic fields. This is contrary to the result for the nonmagnetic system. These phenomena are qualitatively interpreted by considering the competition of the mobile neutral exciton (X), localized negatively-charged exciton (X[sup -]) and, furthermore, the suppression of a free-exciton-magnetic-polaron formation, which is one of the characteristic properties of diluted magnetic semiconductors such as (Cd,Mn)Te. © 2003 American Institute of Physics.


Related Articles

  • Excitonic photoluminescence line shape due to interfacial quality in quantum well structures in a magnetic field. Lee, Johngchul; Sanders, G. D.; Bajaj, K. K. // Journal of Applied Physics;4/1/1991, Vol. 69 Issue 7, p4056 

    Presents a theory correlating the excitonic photoluminescence linewidth in quantum wells with the microscopic structure of the interface in the presence of a magnetic field. Influence of magnetic field on the effective size of the optical probe; Evaluation of the fullwidth at half maximum for...

  • Photoluminescence and magnetophotoluminescence studies in GaInNAs/GaAs quantum wells. Segura, J.; Garro, N.; Cantarero, A.; Miguel-Sánchez, J.; Guzmán, A.; Hierro, A. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p425 

    We investigate the effects of electron and hole localization in the emission of a GaInNAs/GaAs single quantum well at low temperatures. Photoluminescence measurements varying the excitation density and under magnetic fields up to 14 T have been carried out. The results indicate that electrons...

  • Control of spectral and polarization characteristics in semimagnetic asymmetric double quantum wells. Zaitsev, S. V.; Brichkin, A. S.; Dorozhkin, P. S.; Bacher, G. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p417 

    Detailed investigations of steady-state photoluminescence (PL) in Cd(Mg,Mn)Te-based asymmetric double quantum wells (ADQW) have been performed in magnetic fields up to B=10 T. PL spectra are determined by mutual exciton band alignment of adjacent wells in spin-dependent ADQW potential. It is...

  • Spin-Dependent Coupling Of Charged Excitons In Quantum Dots With Continuum States. Urbaszek, B.; Warburton, R. J.; McGhee, E. J.; Ediger, M.; Karrai, K.; Schulhauser, C.; Högele, A.; Marie, X.; Govorov, A. O.; Gerardot, B. D.; Petroff, P. M.; Amand, T. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p751 

    Magnetic field and temperature dependent photoluminescence studies on neutral and charged excitons in individual InAs quantum dots allow us to uncover different mechanisms by which the discrete quantum dot states are coupled to delocalized continuum states in a quantum well (the wetting layer)....

  • Cyclotron-Assisted Resonant Exciton Exchange Between Nearly-Free and Acceptor-Bound States of a Positive Trion. Jadczak, J.; Bryja, L.; Wójs, A.; Bartsch, G.; Yakovlev, D. R.; Bayer, M.; Plochocka, P.; Potemski, M. // AIP Conference Proceedings;12/22/2011, Vol. 1399 Issue 1, p405 

    We report detection of the coupling of two different radiative states in magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well. The pair of coupled states are an acceptor-bound trion AX+ and an essentially free (only weakly localized by a shallow lateral...

  • Magnetic field-dependent photoluminescence linewidths as a probe of disorder length scales in quantum wells. Bansal, Bhavtosh; Hayne, M.; Arora, B. M.; Moshchalkov, V. V. // Applied Physics Letters;12/17/2007, Vol. 91 Issue 25, p251108 

    Photoluminescence from highly disordered GaAs quantum wells is studied in magnetic fields up to 50 T. The monotonic decrease of the photoluminescence linewidth with increasing quantum well thickness indicates that interface roughness is the primary source of line broadening. The magnetic...

  • Excitons and Trions in Heavily Doped QWs at High Magnetic Fields. Kochereshko, V.; Andronikov, D.; Karczewski, G.; Crooker, S. A. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p983 

    Modification of photoluminescence spectra taken from modulation doped CdTe/CdMgTe QW structures have been studied in magnetic fields up to 45T at high concentrations of 2D electrons. The following peculiarities were found in relatively low magnetic fields when filling factors v was higher than...

  • Excitons and excitonic complexes in GaAs/AlGaAs quantum wells with a low-density quasi-two-dimensional electron and hole channel. Volkov, O. V.; Zhitomirskiı, V. E.; Kukushkin, I. V.; von Klitzing, K.; Eberl, K. // JETP Letters;5/10/98, Vol. 67 Issue 9, p744 

    The recombination spectra of excitons and excitonic complexes in undoped GaAs/AlGaAs single quantum wells are investigated. It is shown on the basis of a study of the magnetic-field dependence of the emission spectra and the degree of optical orientation in zero magnetic field and on the basis...

  • Magnetoexciton absorption in coupled quantum wells. Lozovik, Yu. E.; Ruvinskiı, A. M. // Journal of Experimental & Theoretical Physics;Nov97, Vol. 85 Issue 5, p979 

    A Mott exciton in coupled quantum wells in a transverse magnetic field H is considered. An expression for the exciton spectrum in an arbitrary magnetic field for large separations D between quantum wells containing an electron (e) and a hole (h) is given. The exciton spectrum in a strong...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics