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  1. No Access

    Article

    Up on the Jaynes–Cummings ladder of a quantum-dot/microcavity system

    The strong coupling of light and matter is responsible for phenomena such as Bose–Einstein condensation. In a study of strong-coupling effects in semiconductor microcavities, the interaction between a two-leve...

    J. Kasprzak, S. Reitzenstein, E. A. Muljarov, C. Kistner, C. Schneider… in Nature Materials (2010)

  2. Article

    Observation of Bogoliubov excitations in exciton-polariton condensates

    The observation of so-called Bogoliubov excitations provides the first sign of possible superfluid behaviour in an exciton-polariton condensate.

    S. Utsunomiya, L. Tian, G. Roumpos, C. W. Lai, N. Kumada, T. Fujisawa… in Nature Physics (2008)

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  3. No Access

    Chapter

    Emission Characteristics, Photon Statistics and Coherence Properties of high-β Semiconductor Micropillar Lasers

    We report on complementary experiment-theory investigations regarding the photon emission statistics and coherence properties of quantum dot-based semiconductor micropillar lasers with high β factors, i.e., a ...

    S. M. Ulrich, S. Ates, P. Michler, C. Gies, J. Wiersig… in Advances in Solid State Physics (2008)

  4. No Access

    Chapter

    Quantum Dots: Building Blocks of Quantum Devices?

    Among other systems quantum dots have been considered as one of the prime candidates for a solid state quantum information processing that is scalable up to a large number of quantum bits. After some general ...

    Manfred Bayer, G. Ortner, A. Larionov, D.R. Yakovlev… in Advances in Solid State Physics (2004)

  5. No Access

    Article

    Laser-Controlled Magnetization in a Single Magnetic Semiconductor Quantum Dot

    The photoluminescene signal of individual semimagnetic CdSe–Zn0.75Mn0.25Se quantum dots is used to study the magnetization of the Mn2+ spin system in the exchange field of a single exciton. We demonstrate that by...

    H. Schömig, G. Bacher, A. Forchel, S. Lee, M. Dobrowolska… in Journal of Superconductivity (2003)

  6. No Access

    Article

    Spin Dynamics in CdSe/ZnSe Quantum Dots: Resonant Versus Nonresonant Excitation

    We have studied the exciton spin dynamics in CdSe/ZnSe quantum dots, comparing strictly resonant and nonresonant excitation. In case of strictly resonant excitation, excitons are generated in the quantum dot g...

    M. Scheibner, G. Bacher, A. Forchel, T. Passow, D. Hommel in Journal of Superconductivity (2003)

  7. No Access

    Article

    Photoreflectance investigation of hydrogenated (InGa)(AsN)/GaAs heterostructures

    The optical response of as grown and hydrogenated In0.32Ga0.68As1-yNy/GaAs single quantum wells (y = 0, 0.027) has been investigated from T = 80 K to room temperature by photoreflectance. Three excitonic spectral...

    M. Geddo, R. Pezzuto, M. Capizzi… in The European Physical Journal B - Condense… (2002)

  8. No Access

    Chapter

    Microcavities with 3D Optical Confinement

    We have fabricated microcavities with three-dimensional optical confinement by the combination of epitaxially grown vertical cavity surface emitting cavity structures and lithographic patterning. The emission ...

    A. Forchel, J. P. Reithmaier, M. Bayer… in Optical Properties of Semiconductor Nanost… (2000)

  9. No Access

    Chapter and Conference Paper

    GaSb/AlGaSb VCSEL structures and microcavities in the 1.5 μm wavelength range

    Vertical cavity surface emitting laser structures for 1.5 μm wavelength applications were realized by growing AlSb/AlGaSb Bragg mirrors on GaAs substrates with solid source molecular beam epitaxy. Due to the h...

    J. Koeth, R. Dietrich, J. P. Reithmaier, A. Forchel in Advances in Solid State Physics 40 (2000)

  10. No Access

    Chapter

    Optical Investigation of Coupled GaAs/Al0.3Ga0.7As Double Quantum Wells Separated by AIAs Barriers

    Electronically symmetric coupled double quantum wells are structures where two quantum wells are separated by a thin barrier layer. Both experiment and theory show that when the barrier is so narrow that there...

    G. Sęk, K. Ryczko, M. Ciorga, L. Bryja… in Optical Properties of Semiconductor Nanost… (2000)

  11. No Access

    Article

    Kinetics of dark excitons and excitonic trions in InGaAs single quantum well

    Magnetooptical studies performed on a wide InGaAs/GaAs single quantum well indicate that optically non-active (dark) excitons with total angular momentum play the role of a r...

    V.B. Timofeev, A.V. Larionov, J. Zeman… in The European Physical Journal B - Condense… (1998)

  12. No Access

    Chapter

    Patterning of InGaAs/GaAs Quantum Dots Using E-Beam Lithography and Selective Removal of the Top Barrier

    We have used high resolution electron beam lithography and a selective wet etching step to produce effectively buried quantum dots in InGaAs/GaAs single quantum well material. The patterning is carried out wit...

    A. Schmidt, F. Faller, A. Forchel in NANOLITHOGRAPHY: A Borderland between STM,… (1994)

  13. No Access

    Chapter

    Fabrication of Ultrasmall InGaAs/InP Nanostructures by High Voltage Electron Beam Lithography and Wet Chemical Etching

    We have fabricated high quality In0.53Ga0.47As/InP quantum wires by high voltage electron beam lithography and wet chemical etching. Lateral dimensions of the wires down to 16 nm have been achieved. The wires sho...

    P. Ils, M. Michel, A. Forchel, I. Gyuro… in NANOLITHOGRAPHY: A Borderland between STM,… (1994)

  14. No Access

    Chapter

    Microwave Studies of Quasi-One Dimensional Wires

    In the past, the electronic transport in quantum wires has mostly been studied using d.c. or low-frequency measuring techniques (Washburn and Webb, 1986; Heinrich et al., 1988). The use of high-frequency electric...

    F. Kuchar, J. Lutz, K. Y. Lim, R. Meisels, G. Weimann… in Granular Nanoelectronics (1991)

  15. No Access

    Chapter

    Many Body Effects in Homogeneous Quasi 2D Electron-Hole Plasma in Undoped and Modulation Doped INGaAs Single Quantum Wells

    During the past few years a number of studies have addressed the properties of an electron-hole plasma (EHP) in three-dimensional (3D) and two-dimensional (2D) semiconductor structures. The many body effects i...

    L. V. Butov, V. D. Kulakovskii, T. G. Andersson… in Laser Optics of Condensed Matter (1991)

  16. No Access

    Chapter

    Optical Emission from Quantum Wires

    The physical properties of semiconductors with dimensions of the order of the de Broglie wavelength of electrons depend strongly on the device dimensions.1 In thin semiconductor heterostructures (quantum wells) t...

    A. Forchel, B. E. Maile, H. Leier, G. Mayer… in Science and Engineering of One- and Zero-D… (1990)

  17. No Access

    Article

    Bevel fabrication for depth resolved studies of multiple quantum well structures

    Beveled cross-sections of semiconductors with inclination angles down to 0.25 min of arc have been produced with a special ion beam etching process. We applied this technique to the depth resolved characteriza...

    R. Germann, A. Forchel, G. Weimann in Applied Physics A (1988)

  18. No Access

    Chapter and Conference Paper

    High Speed Electron-Hole Plasma Transport in Silicon

    We have studied the expansion of ambipolar plasmas in highly excited Si using two novel optical methods: (i) Time resolved luminescence from excitons bound to impurities introduced in a thin layer beneath the ...

    A. Forchel, B. Laurich, G. Tränkle… in Proceedings of the 17th International Conf… (1985)