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Search Results: 1 - 10 of 540735 matches for " M. L. Sadowski "
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Hot-spots in plasma-focus discharges as intense sources of different radiation pulses
Jakubowski, L.;Sadowski, M.J.;
Brazilian Journal of Physics , 2002, DOI: 10.1590/S0103-97332002000100031
Abstract: the paper concerns pulsed discharges of the plasma-focus (pf) type, and in particular the formation of micro-regions (so-called hot spots) with very high electron concentration and relatively high electron temperature. particular attention is paid to the correlation between x-ray pulses emitted from the hot spots and the emission of pulsed electron beams, ion beams, and the pulsed neutron fluxes.
Hot-spots in plasma-focus discharges as intense sources of different radiation pulses
Jakubowski L.,Sadowski M.J.
Brazilian Journal of Physics , 2002,
Abstract: The paper concerns pulsed discharges of the Plasma-Focus (PF) type, and in particular the formation of micro-regions (so-called hot spots) with very high electron concentration and relatively high electron temperature. Particular attention is paid to the correlation between X-ray pulses emitted from the hot spots and the emission of pulsed electron beams, ion beams, and the pulsed neutron fluxes.
Photoemission studies of the annealing induced modifications of (Ga,Mn)As
M. Adell,L. Ilver,J. Kanski,J. Sadowski,R. Mathieu
Physics , 2004, DOI: 10.1103/PhysRevB.70.125204
Abstract: Using angle resolved photoemission we have investigated annealing-induced changes in Ga(1-x)Mn(x)As with x = 0.05. We find that the position of the Fermi energy is a function of annealing time and temperature. It is also established that the Curie temperature is strongly correlated to the separation between the Fermi level and the valence band maximum. Valence band photoemission shows that the Mn3d spectrum is modified by the annealing treatments
Topological and affine structure of complete flat manifolds
M. Sadowski
Mathematics , 2005,
Abstract: The results of the paper concern the topological structure of complete riemannian manifolds with cyclic holonomy groups and low-dimensional orientable complete flat manifolds. We also discuss related results such as the affine classification of orientable complete flat 4-manifolds, an algebraic criterion of an affine equivalence, the relationship between holonomy homomorphisms and some algebraic and geometric invariants.
Dirac fermions at the H point of graphite: Magneto-transmission studies
M. Orlita,C. Faugeras,G. Martinez,D. K. Maude,M. L. Sadowski,M. Potemski
Physics , 2007, DOI: 10.1103/PhysRevLett.100.136403
Abstract: We report on far infrared magneto-transmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In magnetic field, absorption lines exhibiting a blue-shift proportional to sqrtB are observed. This is a fingerprint for massless Dirac holes at the H point in bulk graphite. The Fermi velocity is found to be c*=1.02x10^6 m/s and the pseudogap at the H point is estimated to be below 10 meV. Although the holes behave to a first approximation as a strictly 2D gas of Dirac fermions, the full 3D band structure has to be taken into account to explain all the observed spectral features.
Magnetospectroscopy of epitaxial few-layer graphene
M. L. Sadowski,G. Martinez,M. Potemski,C. Berger,W. A. de Heer
Physics , 2007, DOI: 10.1016/j.ssc.2007.03.050
Abstract: The inter-Landau level transitions observed in far-infrared transmission experiments on few-layer graphene samples show a behaviour characteristic of the linear dispersion expected in graphene. This behaviour persists in relatively thick samples, and is qualitatively different from that of thin samples of bulk graphite.
Landau level spectroscopy of ultrathin graphite layers
M. L. Sadowski,G. Martinez,M. Potemski,C. Berger,W. A. de Heer
Physics , 2006, DOI: 10.1103/PhysRevLett.97.266405
Abstract: Far infrared transmission experiments are performed on ultrathin epitaxial graphite samples in a magnetic field. The observed cyclotron resonance-like and electron-positron-like transitions are in excellent agreement with the expectations of a single-particle model of Dirac fermions in graphene, with an effective velocity of c* = 1.03 x 10^6 m/s.
Ferromagnetism and interlayer exchange coupling in short period (Ga,Mn)As/GaAs superlattices
R. Mathieu,P. Svedlindh,J. Sadowski,K. Swiatek,M. Karlsteen,J. Kanski,L. Ilver
Physics , 2002, DOI: 10.1063/1.1515368
Abstract: Magnetic properties of (Ga,Mn)As/GaAs superlattices are investigated. The structures contain magnetic (Ga,Mn)As layers, separated by thin layers of non-magnetic GaAs spacer. The short period Ga$_{0.93}$Mn$_{0.07}$As/GaAs superlattices exhibit a paramagnetic-to-ferromagnetic phase transition close to 60K, for thicknesses of (Ga,Mn)As down to 23 \AA. For Ga$_{0.96}$Mn$_{0.04}$As/GaAs superlattices of similar dimensions, the Curie temperature associated with the ferromagnetic transition is found to oscillate with the thickness of non magnetic spacer. The observed oscillations are related to an interlayer exchange interaction mediated by the polarized holes of the (Ga,Mn)As layers.
Electronic structure of (Ga,Mn)As revisited: an alternative view on the "Battle of the bands"
J. Kanski,L. Ilver,K. Karlsson,M. Leandersson,I. Ulfat,J. Sadowski
Physics , 2014,
Abstract: New detailed angle-resolved photoemission data are presented, revealing the existence of an Mn-induced state that extends into the band gap of GaAs. In sharp contrast to recent reports we observe that the state is highly dispersive. Spin resolved photoemission shows that the band is spin polarized even at room temperature. The results are not consistent with any of the currently discussed band models for ferromagnetism.
Formation of Epitaxial MnBi Layers on (Ga,Mn)As
J. Adell,M. Adell,I. Ulfat,L. Ilver,J. Sadowski,J. Kanski
Physics , 2009, DOI: 10.1103/PhysRevB.80.075204
Abstract: The initial growth of MnBi on MnAs terminated (GaMn)As is studied by means of synchrotron based photoelectron spectroscopy. From analysis of surface core level shifts we conclude that a continued epitaxial MnBi layer is formed, in which the MnAs/MnBi interface occurs between As and Bi atomic planes. The well defined 1x2 surface reconstruction of the MnAs surface in preserved for up to 2 ML of MnBi before clear surface degradation occurs.
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