A. Wittlin
Radboud University Nijmegen
22 Papers
137 Citations
A. Wittlin is an academic researcher from Radboud University Nijmegen. The author has contributed to research in topics: Magnetic field & Far infrared. The author has an hindex of 7, co-authored 22 publications. Previous affiliations of A. Wittlin include Polish Academy of Sciences.
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Papers
Cyclotron resonance in ultra-low-hole-density narrow p-type GaAs/(Al,Ga)As quantum wells
B. E. Cole,J.M. Chamberlain,Mohamed Henini,Tin S. Cheng,W. Batty,A. Wittlin,J.A.A.J. Perenboom,Arzhang Ardavan,A. Polisski,J. Singleton +9 more
TL;DR: In this paper, the cyclotron resonance (CR) energy is modeled by inter-Landau-level transitions from the highest level, and a discontinuous evolution to a higher effective mass, observed as the second resonance above 8 T, is explained by crossing of the highest two Landau levels.
High-magnetic-field EPR of Cr-based diluted magnetic semiconductors
M.E.J. Boonman,W. Mac,Andrzej Twardowski,A. Wittlin,A. Wittlin,P.J.M. van Bentum,J.C. Maan,M. Demianiuk +7 more
TL;DR: In this article, the authors studied magnetic interactions in chromium-based diluted magnetic semiconductors by measuring the electron paramagnetic resonance spectrum over the frequency range between 30 and 210 GHz at high magnetic fields up to 20 T oriented along different crystal axes.
C-axis infrared response of tl2ba2ca2cu3o10 studied by oblique-incidence polarized-reflectivity measurements
TL;DR: It is shown that from measurements of the reflectivity of a uniaxial medium taken at a finite incidence angle with [ital s]- and [ital p]-polarized light it is possible to determine the dielectric function both parallel and perpendicular to the optical axis.
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Far-infrared c-axis response of La1.87Sr0.13CuO4 determined by ellipsometry.
TL;DR: Since ellipsometry provides both amplitude and phase information, the complex dielectric function is directly obtained, thereby avoiding the errors introduced by the Kramers-Kronig transformation or the reference determination.
Josephson plasma oscillations in La1.85Sr0.15CuO4
TL;DR: In this article, the c-axis far infrared reflection spectrum of La 1.85 Sr 0.15 CuO 4 was analyzed in a Josephson plasma oscillation model, which provided a novel spectroscopic way to determine the critical current density.