Zobrazeno 1 - 10
of 531
pro vyhledávání: '"W. Ossau"'
Autor:
Andreas D. Wieck, Laurens W. Molenkamp, Paulo V. Santos, Dirk Reuter, W. Ossau, Klaus Biermann, T. Henn, Tobias Kießling
Publikováno v:
physica status solidi (b). 251:1839-1849
We review on time and spatially resolved two-color pump–probe magneto-optical Kerr effect (MOKE) microscopy studies of electron spins in bulk n-GaAs and GaAs (110) quantum wells (QWs) at low lattice temperatures. The influence of photocarrier heati
Autor:
W. Ossau, Robin J. Nicholas, H.H. Cheng, B. Kuhn-Heinrich, Andreas Waag, U. Zehnder, G. Landwehr
Publikováno v:
Scopus-Elsevier
We studied the contribution of the breaking of antiferromagnetically coupled spin clusters to the total magnetization in thin (CdMn)Te layers as a function of tile layer thickness by reflectivity spectroscopy in magnetic fields up to 45 T. The experi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::921a742cfc054fcc88b6b346e4dec501
https://ora.ox.ac.uk/objects/uuid:a0126ec7-fbfe-40e9-b57d-cf56f5f6c500
https://ora.ox.ac.uk/objects/uuid:a0126ec7-fbfe-40e9-b57d-cf56f5f6c500
Autor:
Michael Oestreich, Michael Beck, W. Ossau, S. Bieker, T. Henn, Tobias Kiessling, Jens Hübner, Laurens W. Molenkamp
Publikováno v:
Physical Reviews B 93 (2016)
We use time-resolved photoluminescence (TRPL) spectroscopy to unequivocally clarify the microscopic origin of the nanosecond free exciton photoluminescence rise in GaAs at low temperatures. In crucial distinction from previous work, we examine the TR
Autor:
W. Ossau, Sven Höfling, Laurens W. Molenkamp, J.-H. Quast, J. Heinrich, G. V. Astakhov, Alfred Forchel
Publikováno v:
Scopus-Elsevier
ResearcherID
ResearcherID
We report on all optical spatially resolved spin diffusion experiments in an unstrained, unbiased n-GaAs layer. Optical pump and probe intensities are varied over a wide range to study the impact of optical disturbance on spin transport. Both quantit
Autor:
Georg Schmidt, G. V. Astakhov, W. Ossau, Tobias Kiessling, Karl Brunner, Laurens W. Molenkamp, Alexey V. Platonov, Suddhasatta Mahapatra, Taras Slobodskyy
Publikováno v:
physica status solidi c. 4:3324-3333
We summarize experimental studies on the optical polarization properties of MBE-grown shape-asymmetric self-assembled CdSe/ZnSe quantum dots (QDs). The zero magnetic field fine structure splitting of excitonic transitions in structurally anisotropic
Autor:
W. Ossau, G. V. Astakhov
Publikováno v:
physica status solidi c. 4:3310-3323
We review on optical studies of exciton-electron interaction in modulation doped quantum wells (QWs) based on ZnSe and CdTe semiconductor compounds. The optical properties of QWs containing diluted two-dimensional electron gases (2DEGs) are well desc
Autor:
Eberhard Umbach, M. Schumm, Christian Kumpf, G. Müller, Jean Geurts, Reinhard B. Neder, Michael Lentze, W. Ossau, Vladimir I. Korsunskiy, G. V. Astakhov, Franziska Niederdraenk, Christine Chory
Publikováno v:
physica status solidi c. 4:3260-3269
In order to obtain well-controlled size and optimized structural properties, ZnO nanoparticles were grown from ethanolic solutions using acetate, acetylacetonate and dimethylpropylendiamine as stabilizer molecules. The low-temperature syntheses yield
Autor:
Friedrich Reinert, Tobias Kiessling, E. Margapoti, C. Schumacher, W. Ossau, F. Schmitt, Th. Schmidt, Catherine Bougerol, A. Bendounan, Laurens W. Molenkamp, Suddhasatta Mahapatra, Karl Brunner, J. Renner, Alfred Forchel, J. Geurts, L. Worschech, G. V. Astakhov, U. Bass
Publikováno v:
physica status solidi c. 4:3129-3149
Formation and properties of quantum dots (QDs) and related nanostructures by conventional molecular beam epitaxy (MBE) and two other variants of the technique, have been systematically investigated. While MBE growth of CdSe on ZnSe at 300 °C results
Publikováno v:
physica status solidi c. 4:3161-3165
We have demonstrated growth of the dilute magnetic II–VI semiconductor (Zn,Mn)Se on As-passivated (100) oriented Si substrates. Low temperature epitaxy has been used to optimize the growth start. The morphology has been assessed by Nomarski and sca
Autor:
M. Eyring, A. Avdonin, M. Lentze, C. Kehl, R. R. Gałązka, W. Ossau, Le Van Khoi, G. V. Astakhov, J. Geurts
Publikováno v:
physica status solidi (b). 244:1680-1684
Zn 1-x Mn x Te crystals (0 ≤ x ≤ 0.30) have been grown by the high pressure Bridgman technique. The free exciton energy of Zn 1-x Mn x Te was determined from the photoluminescence and reflectance measurements in the temperature range from 1.7 to