Zobrazeno 1 - 10
of 52
pro vyhledávání: '"M L Sadowski"'
Publikováno v:
International Journal of Modern Physics B. 21:1145-1154
We present a far infrared investigation of the optical transitions in epitaxial graphene subjected to a perpendicular magnetic field. Cyclotron-resonance-like transitions between adjacent electron Landau levels are observed, as well as interband tran
Publikováno v:
Journal of Magnetism and Magnetic Materials. 311:583-588
Pr 3+ ion crystal field (CF) excitations in PrMnO 3 single crystals have been studied by infrared transmission, in the 1800–8000 cm −1 range, as a function of temperature and applied magnetic field up to 13 T. No noticeable frequency shifts which
Publikováno v:
physica status solidi c. 3:1201-1204
Magnetophotoconductivity spectra of uniformly doped CdTe/Cd0.8Mg0.2Te quantum wells are presented. They were taken for fixed photon energy causing the transitions between the shallow donor levels splitted by an external magnetic field. They exhibit a
Autor:
D. Plantier, Zbysław Wilamowski, M. L. Sadowski, M. Byszewski, Marek Potemski, A. S. Sachrajda, G. Karczewski
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 22:652-655
We report optical investigations of Mn 2 + spin resonance in (Cd,Mn)Te dilute magnetic semiconductor quantum wells. Raman scattering spin-flip measurements and optically detected magnetic resonance were performed on thesesamples. Both methods show fe
Autor:
Wojciech Knap, Michel Goiran, Michael Shur, Eric Frayssinet, M. L. Sadowski, Sylvie Contreras
Publikováno v:
Journal of Applied Physics. 89:1251-1255
We report on quantum Hall effect (QHE) and Shubnikov–de-Haas (SdH) measurements for a GaN/GaAlN heterostructure in high magnetic fields (up to 35 T). The observed well defined SdH oscillations, correlated with QHE plateaus, confirm the existence of
Autor:
Jan Jaroszynski, Marek Potemski, G. Karczewski, Francisco J. Teran, Sebastian Mackowski, Duncan K. Maude, M. L. Sadowski
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 6:775-778
We report the results of magneto-optical experiments on two Cd 1− x Mn x Te/Cd 1− y Mg y Te modulation-doped single quantum well (QW) structures, with x =0.005, y =0.2 and electron sheet concentrations n =2.9 and 5.65×10 11 cm −2 . Experiments
Publikováno v:
Physical Review B. 60:10908-10912
Far-infrared photoconductivity measurements were performed on In-doped CdTe layers grown on a semiinsulating GaAs substrate. A thin layer of ZnTe was usually grown between the CdTe and GaAs. The photoconductivity spectra exhibited an extremely rich s
Autor:
Bernard Etienne, I. Elmezouar, M L Sadowski, W. Zawadzki, M. Kamal-Saadi, Andre Raymond, Sandrine Juillaguet
Publikováno v:
Semiconductor Science and Technology. 14:915-920
Cyclotron resonance (CR) and quantum transport measurements are performed on three GaAs/Ga0.67Al0.33As heterostructures in the quantum Hall regime at T = 2 K. The relaxation time and the 2D electron density Ns are determined fitting the CR transmissi
Autor:
Sebastian Mackowski, Francisco J. Teran, M. L. Sadowski, Jan Jaroszynski, G. Karczewski, Marek Potemski
Publikováno v:
Physica B: Condensed Matter. :577-581
We report on magneto-optical experiments on n-modulation doped, diluted magnetic semiconductor (DMS) quantum wells (QW's). A realignment of electronic spins induced by exchange interaction with magnetic ions is clearly observed. Sets of “regular fr
Publikováno v:
physica status solidi (a). 202:590-592
We report on the optical characterization of InN layers in the THz range and magnetic fields up to 13 T. The results are interpreted using the dielectric function formalism, with contributions of cyclotron resonance, phonons, plasmons and helicon wav