Dmitry R. Yakovlev’s research while affiliated with TU Dortmund University and other places

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Publications (4)


Optical Studies of Spin Polarized 2Deg in Modulation-Doped (Zn,Mn)Se/(Zn,Be)Se Quantum Wells in High Magnetic Fields
  • Chapter

July 2011

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23 Reads

Dirk Keller

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G. V. Astakhov

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Dmitry R. Yakovlev

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[...]

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S. A. Crooker

Optical properties of (Zn,Mn)Se/(Zn,Be)Se quantum wells containing a two-dimensional electron gas with densities varying from 109 to 5.5 × 1011 cm-2 have been studied in magnetic fields up to 45 T. A strong s — d exchange interaction of free electrons with magnetic Mn ions results in a giant Zeeman splitting of conduction band states, that has been exploited for manipulation with a spin polarization of the electron gas. Critical behavior of the photoluminescence and reflectivity linewidths and of the energy shift of the lines in magnetic fields in vicinity of integer filling factors 2 and 1 has been found and analyzed. Key wordsquantum well–diluted magnetic semiconductor–excitons–trions


II-VI Quantum Wells with High Carrier Densities and in High Magnetic Fields

July 2011

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13 Reads

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1 Citation

Optical properties of a two-dimensional electron gas in ZnSe/(Zn,Be,Mg)Se quantum well structures have been examined by means Optical properties of a two-dimensional electron gas in ZnSe/(Zn,Be,Mg)Se quantum well structures have been examined by means of photoluminescence and reflectivity techniques in external magnetic fields up to 50 T. For the studied structures, the Fermi of photoluminescence and reflectivity techniques in external magnetic fields up to 50 T. For the studied structures, the Fermi energy of the two-dimensional electron gas falls in the range between the trion binding energy and the exciton binding energy, energy of the two-dimensional electron gas falls in the range between the trion binding energy and the exciton binding energy, which keeps the dominating role of Coulombic interactions between electrons and photoexcited holes. Characteristic peculiarities which keeps the dominating role of Coulombic interactions between electrons and photoexcited holes. Characteristic peculiarities of the optical spectra are discussed. of the optical spectra are discussed.


Combined Exciton-Electron Optical Processes in Optical Spectra of Modulation Doped QWs

April 2003

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11 Reads

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8 Citations

Physica E Low-dimensional Systems and Nanostructures

In modulation-doped quantum well structures with electron concentration of about 10(11) cm(-2), a new resonant optical transition involving four particles (one hole and three electrons) was found in external magnetic fields in photoluminescence excitation and reflectivity spectra. This transition reveals as a narrow line between exciton and trion lines. It is identified with a combined process in which a photocreated exciton binds with an electron forming a trion and promotes for the second electron a transition to higher Landau levels.


Positively and Negatively Charged Trions in ZnSe-Based Quantum Wells

January 2003

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16 Reads

Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies of negatively (X−) and positively (X+) charged excitons are measured as functions of quantum well width, free carrier density and in external magnetic fields up to 47 T. The binding energy of X− shows a strong increase from 1.4 to 8.9 meV with decreasing quantum well width from 19.0 to 2.9 nm. The binding energies of X+ are about 25% smaller than the X− binding energies in the same structures. The magnetic field behavior of X− and X+ binding energies differ qualitatively. With growing magnetic field strength, X− increases its binding energy by 35–150%, while for X+ the binding energy decreases by 25%.

Citations (2)


... To this end we will study below the band shape of the combined optical quantum transitions involving the creation of one magnetoexciton and the simultaneous excitation of an electron from the lower to upper Landau levels. The experimental results in this direction were published in the papers [3,4,5] . Both aspects of the magnetoexciton physics are strongly correlated with the knowledge concerning the influence of the excited Landau levels accumulated in the frame of two earlier published papers [1,2] . ...

Reference:

Bose-Einstein Condensation of two-dimensional magnetoexcitons on the superposition state - art. no. 672632
Combined Exciton-Electron Optical Processes in Optical Spectra of Modulation Doped QWs
  • Citing Article
  • April 2003

Physica E Low-dimensional Systems and Nanostructures

... For n e 3 × 10 10 cm −2 the evaluation was based on the analysis of the circular polarization degree of the photoluminescence in magnetic field [37,38]. Also for n e 5 × 10 11 cm −2 characteristic modifications of the photoluminescence and reflectivity spectra are observed in strong magnetic fields at integer filling factors, which give access to the 2DEG density [39][40][41]. ...

II-VI Quantum Wells with High Carrier Densities and in High Magnetic Fields
  • Citing Chapter
  • July 2011