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4. High-Mobility Two-Dimensional Electron Gas from Delta-Doped Asymmetric AlxGa1-xAs/GaAs/AlyGa1-yAs Quantum Wells

Author

Klaus H. Ploog, Yoshiji Horikoshi, Erdman F. Schubert, and Albrecht Fischer

Subjects
X-ray absorption spectroscopy, Electron mobility, Condensed matter physics, Chemistry, Doping, General Engineering, General Physics and Astronomy, Electron, High-electron-mobility transistor, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, Fermi gas, Quantum well, Molecular beam epitaxy
Abstract

A new delta (δ)-doped asymmetric Al x Ga1-x As/GaAs/Al y Ga1-y As quantum well structure is designed and grown by molecular beam epitaxy which provides a high-mobility two-dimensional electron gas with µ = 3.2×105 cm2/Vs at 5 K. The key feature of the new structure is that no bound states for electrons are found in the asymmetric well if the width is smaller than the critical value. The undesired persistent photoconductivity effect due to deep donors in n-type Al x Ga1-x As: Si does not exist in the structure. Important for high transconductances in field-effect transistor is the narrow spacing between the two-dimensional electron gas and the crystal surface.

Published
1987
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5. Verslag van het debat

Author

Nico Clijmans, Leval, G. De, Maes, B., Erdman, F., and Privaat- en economisch recht

Subjects
judicial law
Abstract

Syntheseverslag

Published
2006

6. [Expression of HLA-D antigens, FcIgG and C3 receptors on peripheral blood monocytes in patients with chronic glomerulonephritis].

Author

Szewczyk Z, Kazimierczak K, Kopeć W, and Erdman F

Subjects
Adolescent, Adult, Chronic Disease, Complement C3 analysis, Female, HLA-D Antigens analysis, Humans, Immunoglobulin Fc Fragments analysis, Male, Middle Aged, Receptors, Complement analysis, Complement C3 immunology, Glomerulonephritis immunology, HLA-D Antigens immunology, Immunoglobulin Fc Fragments immunology, Monocytes immunology, Receptors, Complement immunology
Published
1988

7. Chain urethrocystography before and after urethrovesical suspension for stress incontinence.

Author

Steinhausen TB, Kariher DH, Sherwood CE, and Erdman FS

Subjects
Adult, Aged, Female, Humans, Male, Methods, Middle Aged, Urinary Catheterization instrumentation, Technology, Radiologic, Urethra diagnostic imaging, Urinary Bladder diagnostic imaging, Urinary Incontinence, Stress diagnostic imaging, Urinary Incontinence, Stress surgery, Urography
Published
1970

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