Optical spectroscopy on individual CdSe/ZnMnSe quantum dots

Optical single dot studies in wide-band gap diluted magnetic CdSe/ZnMnSe quantum dots have been performed. Due to the sample design, the photoluminescence energy of the quantum dot signal is energetically below the internal Mn2+ transition, resulting in high quantum efficiencies comparable to nonmagnetic CdSe/ZnSe quantum dots. Magnetic-field- and temperature-dependent measurements on individual dots clearly demonstrate the exchange interaction between single excitons and individual Mn2+ ions, resulting in a giant Zeeman effect and a formation of quasi-zero-dimensional magnetic polarons.

[1]  J. Furdyna,et al.  CdSe quantum dots in a Zn1−xMnxSe matrix: new effects due to the presence of Mn , 2000 .

[2]  Loss,et al.  Quantum dot as spin filter and spin memory , 2000, Physical review letters.

[3]  A. A. Maksimov,et al.  Magnetic polarons in a single diluted magnetic semiconductor quantum dot , 2000 .

[4]  D. DiVincenzo,et al.  Quantum computation with quantum dots , 1997, cond-mat/9701055.

[5]  R. Steingruber,et al.  Effect of random field fluctuations on excitonic transitions of individual CdSe quantum dots , 2000 .

[6]  D. K. Young,et al.  Electrical spin injection in a ferromagnetic semiconductor heterostructure , 1999, Nature.

[7]  B. V. Shanabrook,et al.  Homogeneous Linewidths in the Optical Spectrum of a Single Gallium Arsenide Quantum Dot , 1996, Science.

[8]  James L. Merz,et al.  Formation of self‐assembling CdSe quantum dots on ZnSe by molecular beam epitaxy , 1996 .

[9]  Detlef Hommel,et al.  SINGLE ZERO-DIMENSIONAL EXCITONS IN CDSE/ZNSE NANOSTRUCTURES , 1998 .

[10]  Rosa Weigand,et al.  Fine Structure of Biexciton Emission in Symmetric and Asymmetric CdSe/ZnSe Single Quantum Dots , 1999 .

[11]  D. Awschalom,et al.  ZERO-DIMENSIONAL EXCITONIC CONFINEMENT IN LOCALLY STRAINED ZN1-XCDXSE QUANTUM WELLS , 1997 .

[12]  Jens Hübner,et al.  SPIN INJECTION INTO SEMICONDUCTORS , 1999 .

[13]  F. Henneberger,et al.  Electronic excitations and longitudinal optical phonon modes of self-assembled CdSe quantum dots revealed by microprobe studies , 1999 .

[14]  U. Woggon,et al.  Phonon interaction of single excitons and biexcitons , 1999 .

[15]  M. Scheffler,et al.  Proceedings of the 23rd International Conference on THE PHYSICS OF SEMICONDUCTORS , 1996 .

[16]  R. Fiederling,et al.  Injection and detection of a spin-polarized current in a light-emitting diode , 1999, Nature.

[17]  A. Forchel,et al.  Be-induced island formation in CdSe/ZnSe heterostructures: Ensemble versus single dot studies , 2000 .

[18]  Harrison,et al.  Numerical simulation of antiferromagnetic spin-pairing effects in diluted magnetic semiconductors and enhanced paramagnetism at interfaces. , 1994, Physical review. B, Condensed matter.

[19]  T. Wojtowicz,et al.  Energy transfer from photocarriers into the magnetic ion system mediated by a two-dimensional electron gas in (Cd,Mn)Te/(Cd,Mg)Te quantum wells , 2000 .

[20]  A. Twardowski,et al.  Magnetization and exchange constants in Zn1−xMnxSe , 1984 .

[21]  Howard E. Jackson,et al.  Temperature-dependent micro-photoluminescence of individual CdSe self-assembled quantum dots , 1999 .