Search Results - "Grahn, T"

Suitability of Au- and Self-Assisted GaAs Nanowires for Optoelectronic Applications by Breuer, Steffen, Pfüller, Carsten, Flissikowski, Timur, Brandt, Oliver, Grahn, Holger T, Geelhaar, Lutz, Riechert, Henning

“…The incorporation of Au during vapor−liquid−solid nanowire growth might inherently limit the performance of nanowire-based devices. Here, we assess the…”
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Coherence Resonance and Stochastic Resonance in an Excitable Semiconductor Superlattice by Mompo, Emanuel, Ruiz-Garcia, Miguel, Carretero, Manuel, Grahn, Holger T, Zhang, Yaohui, Bonilla, Luis L

“…Collective electron transport causes a weakly coupled semiconductor superlattice under dc voltage bias to be an excitable system with 2N+2 degrees of freedom:…”
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Terahertz GaAs/AlAs quantum-cascade lasers by Schrottke, L., Lü, X., Rozas, G., Biermann, K., Grahn, H. T.

“…We have realized GaAs/AlAs quantum-cascade lasers operating at 4.75 THz exhibiting more than three times higher wall plug efficiencies than GaAs/Al0.25Ga0.75As…”
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Studies of pear-shaped nuclei using accelerated radioactive beams by Gaffney, L. P., Butler, P. A., Scheck, M., Hayes, A. B., Wenander, F., Albers, M., Bastin, B., Bauer, C., Blazhev, A., Bönig, S., Bree, N., Cederkäll, J., Chupp, T., Cline, D., Cocolios, T. E., Davinson, T., De Witte, H., Diriken, J., Grahn, T., Herzan, A., Huyse, M., Jenkins, D. G., Joss, D. T., Kesteloot, N., Konki, J., Kowalczyk, M., Kröll, Th, Kwan, E., Lutter, R., Moschner, K., Napiorkowski, P., Pakarinen, J., Pfeiffer, M., Radeck, D., Reiter, P., Reynders, K., Rigby, S. V., Robledo, L. M., Rudigier, M., Sambi, S., Seidlitz, M., Siebeck, B., Stora, T., Thoele, P., Van Duppen, P., Vermeulen, M. J., von Schmid, M., Voulot, D., Warr, N., Wimmer, K., Wrzosek-Lipska, K., Wu, C. Y., Zielinska, M.

“…There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are ‘octupole deformed’, that is, distorted into a pear shape. This…”
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Nitride semiconductors free of electrostatic fields for efficient white light-emitting diodes by Waltereit, P, Brandt, O, Trampert, A, Grahn, H. T, Menniger, J, Ramsteiner, M, Reiche, M, Ploog, K. H

“…Compact solid-state lamps based on light-emitting diodes (LEDs) are of current technological interest as an alternative to conventional light bulbs. The…”
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Real-time terahertz imaging through self-mixing in a quantum-cascade laser by Wienold, M., Hagelschuer, T., Rothbart, N., Schrottke, L., Biermann, K., Grahn, H. T., Hübers, H.-W.

“…We report on a fast self-mixing approach for real-time, coherent terahertz imaging based on a quantum-cascade laser and a scanning mirror. Due to a fast…”
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Frequency stabilization of a terahertz quantum-cascade laser to the Lamb dip of a molecular absorption line by Voigt, R, Wienold, M, Jayasankar, D, Drakinskiy, V, Stake, J, Sobis, P, Schrottke, L, Lü, X, Grahn, H T, Hübers, H-W

“…We demonstrate the frequency stabilization of a terahertz quantum-cascade laser (QCL) to the Lamb dip of the absorption line of a D O rotational transition at…”
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Epitaxial Growth of GaN Nanowires with High Structural Perfection on a Metallic TiN Film by Wölz, M, Hauswald, C, Flissikowski, T, Gotschke, T, Fernández-Garrido, S, Brandt, O, Grahn, H. T, Geelhaar, L, Riechert, H

“…Vertical GaN nanowires are grown in a self-induced way on a sputtered Ti film by plasma-assisted molecular beam epitaxy. Both in situ electron diffraction and…”
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Observation of Dielectrically Confined Excitons in Ultrathin GaN Nanowires up to Room Temperature by Zettler, Johannes K, Corfdir, Pierre, Hauswald, Christian, Luna, Esperanza, Jahn, Uwe, Flissikowski, Timur, Schmidt, Emanuel, Ronning, Carsten, Trampert, Achim, Geelhaar, Lutz, Grahn, Holger T, Brandt, Oliver, Fernández-Garrido, Sergio

“…The realization of semiconductor structures with stable excitons at room temperature is crucial for the development of excitonics and polaritonics. Quantum…”
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Frequency dependence of the maximum operating temperature for quantum-cascade lasers up to 5.4 THz by Wienold, M., Röben, B., Lü, X., Rozas, G., Schrottke, L., Biermann, K., Grahn, H. T.

“…We report on the observation of an approximately linear reduction in the maximum operating temperature with an increasing emission frequency for terahertz…”
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Direct observation of E0 transitions in 188Pb through in-beam spectroscopy by Papadakis, P., Pakarinen, J., Briscoe, A.D., Cox, D.M., Julin, R., Auranen, K., Grahn, T., Greenlees, P.T., Hadyńska-Klek, K., Herzáň, A., Herzberg, R.-D., Jakobsson, U., Juutinen, S., Konki, J., Leino, M., Mistry, A., O'Donnell, D., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Stoltze, S., Sorri, J., Uusitalo, J., Wrzosek-Lipska, K.

“…Competing configurations, assigned with three different shapes, are mixed at low angular momentum in the neutron-deficient 188Pb nucleus. Here, we present a…”
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Optical communication of spin information between light emitting diodes by Farshchi, R., Ramsteiner, M., Herfort, J., Tahraoui, A., Grahn, H. T.

“…For the full implementation of spintronic circuits, it is necessary to transmit spin information from one device to another. Electrons in semiconductors often…”
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Octupole correlations in the N = Z + 2 = 56 110Xe nucleus by Illana, A., Pérez-Vidal, R.M., Stramaccioni, D., Valiente-Dobón, J.J., Rodriguez, T.R., Robledo, L.M., Poves, A., Auranen, K., Beliuskina, O., Delafosse, C., Eronen, T., Ge, Z., Geldhof, S., Gins, W., Grahn, T., Greenlees, P.T., Joukainen, H., Julin, R., Jutila, H., Kankainen, A., Leino, M., Louko, J., Luoma, M., Nesterenko, D., Ojala, J., Pakarinen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Uusitalo, J., Zimba, G.L.

“…This letter reports on the first observation of an octupole band in the neutron-deficient (N=Z+2) nucleus 110Xe. The 110Xe nuclei were produced via the…”
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First observation of excited states in 120La and its impact on the shape evolution in the A ≈ 120 mass region by Jodidar, P.M., Petrache, C.M., Lv, B.F., Lawrie, E.A., Astier, A., Guo, S., Zheng, K.K., Auranen, K., Briscoe, A.D., Grahn, T., Greenlees, P.T., Illana, A., Joukainen, H., Julin, R., Louko, J., Luoma, M., Jutila, H., Ojala, J., Pakarinen, J., Plaza, A.M., Rahkila, P., Ruotsalainen, P., Sarén, J., Tolosa-Delgado, A., Uusitalo, J., Zimba, G., Kuti, I., Krakó, A., Andreoiu, C., Joss, D.T., Page, R.D., Cederlöf, E.A., Ertoprak, A.

“…Excited states have been observed for the first time in the very neutron-deficient odd-odd nucleus 57120La63. The observed γ rays have been assigned based on…”
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The spectroscopic quadrupole moment of the 21+ state of 12C: A benchmark of theoretical models by Saiz-Lomas, J., Petri, M., Lee, I.Y., Syndikus, I., Heil, S., Allmond, J.M., Gaffney, L.P., Pakarinen, J., Badran, H., Calverley, T., Cox, D.M., Forsberg, U., Grahn, T., Greenlees, P., Hadyńska-Klȩk, K., Hilton, J., Jenkinson, M., Julin, R., Konki, J., Macchiavelli, A.O., Mathy, M., Ojala, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Stolze, S., Uusitalo, J., Wadsworth, R.

“…The spectroscopic quadrupole moment of the first 2+ state of 12C has been measured employing the Coulomb-excitation re-orientation technique. Our result of…”
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Absence of Quantum-Confined Stark Effect in GaN Quantum Disks Embedded in (Al,Ga)N Nanowires Grown by Molecular Beam Epitaxy by Sinito, C, Corfdir, P, Pfüller, C, Gao, G, Bartolomé, J, Kölling, S, Rodil Doblado, A, Jahn, U, Lähnemann, J, Auzelle, T, Zettler, J. K, Flissikowski, T, Koenraad, P, Grahn, H. T, Geelhaar, L, Fernández-Garrido, S, Brandt, O

“…Several of the key issues of planar (Al,Ga)­N-based deep-ultraviolet light-emitting diodes could potentially be overcome by utilizing nanowire…”
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Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W by Briscoe, A.D., Page, R.D., Uusitalo, J., Joss, D.T., AlAqeel, M.A.M., Alayed, B., Andel, B., Antalic, S., Auranen, K., Ayatollahzadeh, H., Badran, H., Barber, L., Beeton, G., Birova, M., Bogdanoff, V., Clark, R.M., Cubiss, J.G., Cullen, D.M., Deary, J., Forsberg, U., Grahn, T., Greenlees, P.T., Hilton, J.B., Illana, A., Joukainen, H., Judson, D.S., Julin, R., Jutila, H., Keatings, J.M., Labiche, M., Leino, M., Lewis, M.C., Louko, J., Luoma, M., Martel, I., McCarter, A., McKee, P.P., Mosat, P., Nathaniel, S.N., Neuvonen, O., O'Donnell, D., Ojala, J., Page, C.A.A., Plaza, A.M., Pakarinen, J., Papadakis, P., Parr, E., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Saygi, B., Smallcombe, J., Smith, J.F., Sorri, J., Sullivan, C.M., Szwec, S., Tann, H., Tolosa-Delgado, A., Uusikylä, E., Venhart, M., Waring, L.J., Zimba, G.

“…The radioactivity of 76160Os84 and 74156W82 that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of…”
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Long-term stability of GaAs/AlAs terahertz quantum-cascade lasers by Schrottke, L., Lü, X., Biermann, K., Gellie, P., Grahn, H. T.

“…We have investigated high-performance GaAs/AlAs terahertz (THz) quantum-cascade lasers (QCLs) with respect to the long-term stability of their operating…”
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Isospin symmetry in the T = 1,A = 62 triplet by Wimmer, K., Ruotsalainen, P., Lenzi, S.M., Poves, A., Hüyük, T., Browne, F., Doornenbal, P., Koiwai, T., Arici, T., Auranen, K., Bentley, M.A., Cortés, M.L., Delafosse, C., Eronen, T., Ge, Z., Grahn, T., Greenlees, P.T., Illana, A., Imai, N., Joukainen, H., Julin, R., Jungclaus, A., Jutila, H., Kankainen, A., Kitamura, N., Longfellow, B., Louko, J., Lozeva, R., Luoma, M., Mauss, B., Napoli, D.R., Niikura, M., Ojala, J., Pakarinen, J., Pereira-Lopez, X., Rahkila, P., Recchia, F., Sandzelius, M., Sarén, J., Taniuchi, R., Tann, H., Uthayakumaar, S., Uusitalo, J., Vaquero, V., Wadsworth, R., Zimba, G., Yajzey, R.

“…Excited states in the Tz=0,−1 nuclei 62Ga and 62Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident γ rays were…”
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Evidence against the wobbling nature of low-spin bands in 135Pr by Lv, B.F., Petrache, C.M., Lawrie, E.A., Guo, S., Astier, A., Zheng, K.K., Ong, H.J., Wang, J.G., Zhou, X.H., Sun, Z.Y., Greenlees, P.T., Badran, H., Calverley, T., Cox, D.M., Grahn, T., Hilton, J., Julin, R., Juutinen, S., Konki, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Cederwall, B., Ertoprak, A., Liu, H., Kuti, I., Timár, J., Tucholski, A., Srebrny, J., Andreoiu, C.

“…The electromagnetic character of the ΔI=1 transitions connecting the 1- to 0-phonon and the 2- to 1-phonon wobbling bands should be dominated by an E2…”
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