Search Results - "Kostial, H."

Room-temperature spin injection from Fe into GaAs by Zhu, H J, Ramsteiner, M, Kostial, H, Wassermeier, M, Schönherr, H P, Ploog, K H

“…Injection of spin polarized electrons from a metal into a semiconductor is demonstrated for a GaAs/(In,Ga)As light emitting diode covered with Fe. The circular…”
Get full text

Spin injection from Fe3Si into GaAs by Kawaharazuka, A., Ramsteiner, M., Herfort, J., Schönherr, H.-P., Kostial, H., Ploog, K. H.

“…We demonstrate room-temperature spin injection from the epitaxially grown ferromagnetic metal Fe3Si into the semiconductor GaAs. The injection efficiency is…”
Get full text

Giant asymmetry of the longitudinal magnetoresistance in high-mobility two-dimensional electron gas on a cylindrical surface by Vorob’ev, A. B., Friedland, K.-J., Kostial, H., Hey, R., Jahn, U., Wiebicke, E., Yukecheva, Ju. S., Prinz, V. Ya

Get full text

Quantum Hall effect in a high-mobility two-dimensional electron gas on the surface of a cylinder by Friedland, K.-J., Siddiki, A., Hey, R., Kostial, H., Riedel, A., Maude, D. K.

Get full text

Measurements of ballistic transport at nonuniform magnetic fields in cross junctions of a curved two-dimensional electron gas by Friedland, K.-J., Hey, R., Kostial, H., Riedel, A., Ploog, K. H.

Get full text

New Concept for the Reduction of Impurity Scattering in Remotely Doped GaAs Quantum Wells by Friedland, K, Hey, R, Kostial, H, Klann, R, Ploog, K

Get full text

Lasing properties of GaAs/(Al,Ga)As quantum-cascade lasers as a function of injector doping density by Giehler, M., Hey, R., Kostial, H., Cronenberg, S., Ohtsuka, T., Schrottke, L., Grahn, H. T.

“…The lasing properties of GaAs/Al0.33Ga0.67As quantum-cascade lasers are investigated as a function of injector doping concentration ns between 2×1011 and…”
Get full text

Impact of N-induced potential fluctuations on the electron transport in Ga(As,N) by Ishikawa, F., Mussler, G., Friedland, K.-J., Kostial, H., Hagenstein, K., Däweritz, L., Ploog, K. H.

“…We investigate the electron transport in Ga(As,N) layers focusing on the influence of potential fluctuations. With increasing electron concentration, a…”
Get full text

Self-organized etching technique for fabricating a quasiregular array of MnAs nanoislands by Takagaki, Y., Wiebicke, E., Hesjedal, T., Kostial, H., Herrmann, C., Däweritz, L., Ploog, K. H.

“…We present a method to fabricate arrays of MnAs islands having diameters of less than 100 nm without using nanofabrication techniques. The strain balance in…”
Get full text

Heavy-Light Hole Quantum Beats in the Band-to-Band Continuum of GaAs Observed in 20 Femtosecond Pump-Probe Experiments by Joschko, Markus, Woerner, Michael, Elsaesser, Thomas, Binder, Eberhard, Kuhn, Tilmann, Hey, R., Kostial, H., Ploog, K.

Get full text

Electron trajectories on a cylindrical surface studied by ballistic transport and quantum Hall effect measurements by Friedland, K.-J., Hey, R., Kostial, H., Riedel, A., Maude, D.K.

“…Magnetotransport in a high-mobility, two-dimensional electron gas on a cylindrical surface reveal peculiarities of the electron motion due to the presence of…”
Get full text

Visualization of current filaments in n -GaAs by photoluminescence quenching by Eberle, W., Hirschinger, J., Margull, U., Prettl, W., Novák, V., Kostial, H.

“…Hot electrons in semiconductors are known to quench radiative impurity and exciton recombination photoluminescence. This effect has been applied in a low…”
Get full text

Interface properties of isotype GaAs/(In,Ga)P/GaAs heterojunctions grown by metalorganic-vapour-phase epitaxy on GaAs by Krispin, P., Asghar, M., Knauer, A., Kostial, H.

“…Metal-semiconductor contacts are used to examine the depth-resolved electrical characteristics of Si- and Zn-doped GaAs/(In,Ga)P/GaAs heterojunctions by…”
Get full text

Enhanced radiative efficiency in blue (In,Ga)N multiple-quantum-well light-emitting diodes with an electron reservoir layer by Takahashi, Y, Satake, A, Fujiwara, K, Shue, J.K, Jahn, U, Kostial, H, Grahn, H.T

“…The temperature dependence of the electroluminescence (EL) spectral intensity of two blue (In,Ga)N/GaN multiple-quantum-well (MQW) light-emitting diodes (LEDs)…”
Get full text

Conductance anisotropy of high-mobility two-dimensional hole gas at GaAs/(Al,Ga)As( [formula omitted])A single heterojunctions by Hey, R, Friedland, K.J, Kostial, H, Ploog, K.H

“…We investigate the anisotropy of mobility of two-dimensional hole gases formed at modulation-doped single GaAs/(Al,Ga)As heterojunctions on GaAs( 1 1 3 )A in…”
Get full text

Controllable bistabilities and bifurcations in a photoexcited GaAs/AlAs superlattice by Luo, K. J., Teitsworth, S. W., Kostial, H., Grahn, H. T., Ohtani, N.

“…Self-sustained photocurrent oscillations and bifurcation processes have been experimentally investigated in an undoped, photoexcited GaAs/AlAs superlattice by…”
Get full text

Conductance anisotropy of high-mobility, modulation-doped GaAs single quantum wells by Friedland, K.-J, Hey, R, Bierwagen, O, Kostial, H, Hirayama, Y, Ploog, K.H

Get full text

Visualization of lateral movement of current-filaments in n-GaAs by Hirschinger, J, Kostial, H, Prettl, W

“…In the regime of low-temperature impurity breakdown the influence of a magnetic field on current filaments yields complex voltage oscillations. With a new…”
Get full text

Subband population and current instabilities in GaAs/(Al,Ga)As quantum-cascade structures by Schrottke, L, Hey, R, Kostial, H, Ohtsuka, T, Grahn, H.T

“…We have investigated the transport and population properties of an undoped GaAs/(Al,Ga)As quantum-cascade structure (QCS) below and above the designed…”
Get full text

Arcing at B4C-covered limiters exposed to a SOL-plasma by Laux, M., Schneider, W., Wienhold, P., Jüttner, B., Huber, A., Balden, M., Linke, J., Kostial, H., Mayer, M., Rubel, M., Herrmann, A., Pospieszczyk, A., Jachmich, S., Schweer, B., Hildebrandt, D., Bolt, H.

“…Plasma sprayed B4C-layers considered as wall coatings for the W7X stellarator have been studied during and after exposure to TEXTOR and after arcing…”
Get full text