Stephan Glamsch und Helmut Karl
Large effect of temperature cycling on the electrical and optical properties of TiO2:H thin films
Journal of Physical Chemistry C 127, 14415-14424 (2023)
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Florian Jung und Helmut Karl
Controlled strained layer epitaxial growth of EuTiO3 on buffered silicon
Journal of Applied Physics 131, 205303 (2022)
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Florian Jung, Ralph Delmdahl, Andreas Heymann, Max Fischer und Helmut Karl
Surface evolution of crystalline SrTiO3, LaAlO3 and Y3Al5O12 targets during pulsed laser ablation
Applied Physics A 128, 750 (2022)
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J. Scharnetzky, P. Baumann, C. Reichl, Helmut Karl, W. Dietsche und W. Wegscheider
Donor implanted back-gates in GaAs for MBE-grown highest mobility two-dimensional electron systems
Semiconductor Science and Technology 36, 085012 (2021)
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Alfred Grießer, Thomas Kraus, Oliver Klein und Helmut Karl
Low-resistance electrical contact between epitaxially grown thermoelectric oxide material (Ca2CoO3)0.62CoO2 and iridium
Thin Solid Films 717, 138420 (2021)
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Jimmy John, Yael Gutierrez, Zhen Zhang, Helmut Karl, Shriram Ramanathan, Régis Orobtchouk, Fernando Moreno und Sébastien Cueff
Multipolar resonances with designer tunability using VO2 phase-change materials
Physical Review Applied 13, 044053 (2020)
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Jan Mundry, Hubert J. Krenner, Helmut Karl und Markus Betz
Near-infrared saturable and reverse saturable absorption of ion beam synthesized VO2 nanocrystals
Optical Materials Express 10, 1630-1640 (2020)
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A. Hartwig, O. Klein und Helmut Karl
Sputtered titanium dioxide thin films for galvanic corrosion protection of AISI 304 stainless steel coupled with carbon fiber reinforced plastics
Thin Solid Films 621, 211-219 (2017)
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Birgit Hebler, Alexander Hassdenteufel, Patrick Reinhardt, Helmut Karl und Manfred Albrecht
Ferrimagnetic Tb–Fe alloy thin films: composition and thickness dependence of magnetic Properties and all-optical switching
Frontiers in Materials 3, 8 (2016)
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M. Berl, L. Tiemann, W. Dietsche, Helmut Karl und Werner Wegscheider
Structured back gates for high-mobility two-dimensional electron systems using oxygen ion implantation
Applied Physics Letters 108, 132102 (2016)
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Andreas Brenneis, Felix Schade, Simon Drieschner, Florian Heimbach, Helmut Karl, Jose A. Garrido und Alexander W. Holleitner
THz-circuits driven by photo-thermoelectric, gate-tunable graphene-junctions
Scientific Reports 6, 35654 (2016)
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Thorben Jostmeier, Hans Moritz Mangold, Johannes Zimmer, Helmut Karl, Hubert J. Krenner, Claudia Ruppert und Markus Betz
Thermochromic modulation of surface plasmon polaritons in vanadium dioxide nanocomposites
Optics Express 24, 17321-17331 (2016)
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M. F. Sarmanova, Helmut Karl, Stephan Mändl, D. Hirsch, S.G. Mayr und Bernd Rauschenbach
Elastic properties of sub-stoichiometric nitrogen ion implanted silicon
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 349, 169-172 (2015)
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V. Baranwal, Jürgen W. Gerlach, A. Lotnyk, Bernd Rauschenbach, Helmut Karl, S. Ojha, D. K. Avasthi, D. Kanjilal und Avinash C. Pandey
Embedded Ge nanocrystals in SiO2 synthesized by ion implantation
Journal of Applied Physics 118, 134303 (2015)
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Alexander Hartwig, M. Decker, O. Klein und Helmut Karl
Stoichiometric titanium dioxide ion implantation in AISI 304 stainless steel for corrosion protection
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 365, 94-99 (2015)
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Helmut Karl und S.C. Peyinghaus
Tailoring of the thermomechanical performance of VO2 nanowire bimorph actuators by ion implantation
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 365, 75-78 (2015)
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N. Erhard, S. Zenger, Stefanie Morkötter, Daniel Rudolph, M. Weiss, Hubert J. Krenner, Helmut Karl, Gerhard Abstreiter, Jonathan J. Finley, Gregor Koblmüller und A. W. Holleitner
Ultrafast Photodetection in the Quantum Wells of Single AlGaAs/GaAs-Based Nanowires
Nano Letters 15, 6869-6874 (2015)
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Christoph Kastl, Christoph Karnetzky, Helmut Karl und Alexander W. Holleitner
Ultrafast helicity control of surface currents in topological insulators with near-unity fidelity
Nature Communications 6, 6617 (2015)
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Thorben Jostmeier, Johannes Zimmer, Helmut Karl, Hubert J. Krenner und Markus Betz
Optical Preparation of Stable Supercooled VO2 Nanocrystals: A Route Towards Reconfigurable Photonic Devices for TelecomWavelengths
in: 2014 Conference on Lasers and Electro-Optics, CLEO: Science and Innovations 2014 , San Jose, California United States, 8–13 June 2014, STu2H.1 (Optical Society of America: Washington, D.C., 2014)
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Thorben Jostmeier, Johannes Zimmer, Helmut Karl, Hubert J. Krenner und Markus Betz
Optically imprinted reconfigurable photonic elements in a VO2 nanocomposite
Applied Physics Letters 105, 071107 (2014)
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Hans Moritz Mangold, Helmut Karl und Hubert J. Krenner
Site-Selective Ion Beam Synthesis and Optical Properties of Individual CdSe Nanocrystal Quantum Dots in a SiO2 Matrix
ACS Applied Materials & Interfaces 6, 1339-1344 (2014)
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Andreas Brenneis, Louis Gaudreau, Max Seifert, Helmut Karl, Martin S. Brandt, Hans Huebl, Jose A. Garrido, Frank H. L. Koppens und Alexander W. Holleitner
Ultrafast electronic readout of diamond nitrogen–vacancy centres coupled to graphene
Nature Nanotechnology 10, 135-139 (2014)
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T. Kraus, A. Griesser, O. Klein, Martin Fischer, Matthias Schreck und Helmut Karl
Yttria-stabilized zirconia buffered silicon to optimize in-plane electrical conductivity of [Ca2CoO3]0.62[CoO2] thin films
Applied Physics Letters 104, 183104 (2014)
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Johannes Zimmer, Simon A. Haug, Achim Wixforth, Helmut Karl und Hubert J. Krenner
Nanothermochromic diffraction gratings with giant switching contrast based on the metal-insulator transition of vanadium dioxide
in: Oxide-based materials and devices IV: proceedings, 3 - 6 February 2013, San Francisco, California, United States, hrsg. von Ferechteh Hosseini Teherani, David C. Look und David J. Rogers, (Proceedings SPIE ; Volume 8626) 862614 (SPIE: Bellingham, WA, 2013)
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Nadine Erhard, Paul Seifert, Leonhard Prechtel, Simon Hertenberger, Helmut Karl, Gerhard Abstreiter, Gregor Koblmüller und Alexander W. Holleitner
Ultrafast photocurrents and THz generation in single InAs-nanowires
Annalen der Physik 525, 180-188 (2013)
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Johannes Zimmer, Achim Wixforth, Helmut Karl und Hubert J. Krenner
Ion beam synthesis of nanothermochromic diffraction gratings with giant switching contrast at telecom wavelengths
Applied Physics Letters 100, 231911 (2012)
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Erratum: https://doi.org/10.1063/1.4766169

Leonhard Prechtel, Milan Padilla, Nadine Erhard, Helmut Karl, Gerhard Abstreiter, Anna Fontcuberta I Morral und Alexander W. Holleitner
Time-resolved photoinduced thermoelectric and transport currents in GaAs nanowires
Nano Letters 12, 2337-2341 (2012)
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Thomas Wehlus, Timo H. Körner, Stefan Nowy, Jörg Frischeisen, Helmut Karl, Bernd Stritzker und Wolfgang Brütting
Hybrid organic-inorganic materials for integrated optoelectronic devices
physica status solidi (a) 208, 264-275 (2011)
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Helmut Karl, Jing Peng und Bernd Stritzker
Effects of He-irradiation on the metal-to-insulator transition of vanadium dioxide nanoclusters
MRS Proceedings 1256, 1256-N11-62 (2010)
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D. J. As, E. Tschumak, H. Pöttgen, O. Kasdorf, Jürgen W. Gerlach, Helmut Karl und K. Lischka
Carbon doping of non-polar cubic GaN by CBr4
Journal of Crystal Growth 311, 2039-2041 (2009)
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Helmut Karl, J. Dreher und Bernd Stritzker
Semiconductor-metal phase transition in doped ion beam synthesized VO2 nanoclusters
MRS Proceedings 1174, 1174-V06-35 (2009)
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A. W. Achtstein, Helmut Karl, S. Zhenhua und Bernd Stritzker
Memory effects in optically active CdSe nanocrystal doped MOS structures
Materials Science and Engineering: B 147, 249-253 (2008)
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Rosiana Aguiar, Dmitry Logvinovich, Anke Weidenkaff, Helmut Karl, Christof W. Schneider, Armin Reller und Stefan G. Ebbinghaus
Physical properties of (La,Sr)Ti(O,N)3 thin films grown by pulsed laser deposition
Materials Research Bulletin 43, 1376-1383 (2008)
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V. Baranwal, Avinash C. Pandey, Jürgen W. Gerlach, Bernd Rauschenbach, Helmut Karl, D. Kanjilal und D. K. Avasthi
Rapid thermal and swift heavy ion induced annealing of Co ion implanted GaN films
Journal of Applied Physics 103, 124904 (2008)
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Helmut Karl
Combinatorial ion beam synthesis of II-VI compound semiconductor nanoclusters
in: Combinatorial and high-throughput discovery and optimization of catalysts and materials, hrsg. von Radislav A. Potyrailo und Wilhelm F. Maier, 337-360 (CRC/Taylor & Francis: Boca Raton, FL [u.a.], 2007)
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P. Huber, Helmut Karl und Bernd Stritzker
Combinatorial ion beam synthesis of CdSxSe1-x nanocrystals
Applied Surface Science 252, 2497-2502 (2006)
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A. W. Achtstein, Helmut Karl und Bernd Stritzker
Electric-field-controlled photoluminescence of CdSe nanocrystal-doped SiO2 on Si
Journal of Luminescence 121, 365-368 (2006)
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A. W. Achtstein, Helmut Karl und Bernd Stritzker
Field induced photoluminescence quenching and enhancement of CdSe nanocrystals embedded in SiO2
Applied Physics Letters 89, 061103 (2006)
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Helmut Karl, Ch. Delpero, P. Huber und Bernd Stritzker
Recovery of the Si-SiO2 interface studied by self-diffusion after high fluence ion implantation of Si-28
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 242, 683-685 (2006)
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Helmut Karl, Ch. Delpero, P. Huber und Bernd Stritzker
Recovery of the Si–SiO2 interface studied by self-diffusion after high fluence ion implantation of 28Si
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 242, 683-685 (2006)
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S. Groudeva-Zotova, Helmut Karl, A. Savan, J. Feydt, B. Wehner, T. Walther, N. Zotov, Bernd Stritzker und A. Ludwig
Structural and magnetic characteristics of FeCo thin films modified by combinatorial ion implantation
Thin Solid Films 495, 169-174 (2006)
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P. Huber, Helmut Karl, Jörg K. N. Lindner und Bernd Stritzker
Structural investigation of CdSSe-nanocrystals synthesized by ion-beam-implantation
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 242, 170-172 (2006)
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P. Huber, Helmut Karl und Bernd Stritzker
Synthesis and laser annealing of embedded CdSe-nanoparticles in SiO2 by pulsed excimer laser radiation
Applied Physics Letters 88, 203123 (2006)
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Helmut Karl, Ingo Großhans und Bernd Stritzker
Combinatorial ion beam synthesis of semiconductor nanoclusters
Measurement Science and Technology 16, 32-40 (2005)
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I. D. Desnica-Frankovic, P. Dubček, M. Buljan, K. Furic, U. V. Desnica, S. Bernstorff, Helmut Karl, Ingo Großhans und Bernd Stritzker
Influence of stoichiometry deviations on properties of ion-beam synthesized CdSe QDs
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 238, 302-305 (2005)
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Stefan Gsell, Matthias Schreck, Thomas Bauer, Helmut Karl, Götz Thorwarth, A. Bergmaier, G. Dollinger und Bernd Stritzker
The nucleation centers formed during bias-enhanced nucleation of diamond on iridium: structure and stability
Diamond and Related Materials 14, 328-334 (2005)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Combinatorial ion implantation – a smart technique applied to synthesize CdSe-nanocrystals
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 216, 396-401 (2004)
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Helmut Karl, Ingo Großhans und Bernd Stritzker
Self organized compound semiconductor nanocrystallite distributions in SiO2 on Silicon synthesized by ion implantation
in: Self-organized processes in semiconductor heteroepitaxy: symposium held December 1 - 5, 2003, Boston, Massachusetts, USA, hrsg. von Andrew G. Norman, (Materials Research Society Symposia Proceedings ; 794) (Materials Research Society: Warrendale, PA, 2004)
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Helmut Karl, I. Groβhans, P. Huber und Bernd Stritzker
Superfluorescence of ion beam synthesized dense-packed embedded CdSe nanoclusters
MRS Proceedings 829, B3.5 (2004)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Synthesis and screening of materials libraries of buried compound semiconductors by ion beam implantation
in: Combinatorial and artificial intelligence methods in materials science II: symposium held December 1-4, 2003, Boston, Massachusetts, U.S.A. [at the 2003 MRS fall meeting], hrsg. von Radislav A. Potyrailo, Alamgir Karim, Qi Wang und Toyohiro Chikyow, (Materials Research Society Symposia Proceedings ; 804) (Materials Research Society: Warrendale, PA, 2004)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Temporal evolution of ion implanted CdSe distribution in SiO2 on Silicon during annealing
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 219-220, 820-824 (2004)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Advanced apparatus for combinatorial synthesis of buried II-VI nanocrystals by ion implantation
Materials Science and Engineering: B 101, 212-215 (2003)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Automated implanter endstation for combinatorial materials science with ion beams
in: Application of accelerators in research and industry: 17th International Conference on the Application of Accelerators in Research and Industry, Denton, Texas, 12-16 November 2002, hrsg. von Jerome L. Duggan und I. L. Morgan, (AIP Conference Proceedings ; 680) 690-693 (American Institute of Physics: Melville, NY, 2003)
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I. D. Desnica-Frankovic, U. V. Desnica, P. Dubček, M. Buljan, S. Bernstorff, Helmut Karl, Großhans und Bernd Stritzker
Ion beam synthesis of buried Zn-VI quantum dots in SiO2 – grazing incidence small-angle X-ray scattering studies
Journal of Applied Crystallography 36, 439-442 (2003)
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W. Hipp, Helmut Karl, Ingo Großhans und Bernd Stritzker
Quantum confinement in CdSe-nanocrystallites synthesized by ion implantation
Materials Science and Engineering: B 101, 318-323 (2003)
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Andreas Heinrich, Bernhard Wörz, Helmut Karl und Bernd Stritzker
Study of a non-thermal/thermal formation of NiO on Ni5W-tapes
IEEE Transactions on Applied Superconductivity 13, 2559-2562 (2003)
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Ingo Großhans, Helmut Karl und Bernd Stritzker
Combinatorial synthesis of ZnTe nanocrystals in SiO2 on Silicon by ion implantation
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 190, 865-868 (2002)
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Helmut Karl, K. Y. Gao, Ingo Großhans, W. Hipp und Bernd Stritzker
Comparative study of as-implanted and pre-damaged ion-beam-synthesized ZnS nanocrystallites in SiO2
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 196, 68-74 (2002)
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Helmut Karl, W. Hipp, Ingo Großhans und Bernd Stritzker
Ion beam synthesis of buried CdSe nanocrystallites in SiO2 on (100)-Silicon
Materials Science and Engineering: C 19, 55-58 (2002)
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Helmut Karl, Ingo Großhans, Axel Wenzel, Bernd Stritzker, Ralph Claessen, Vladimir Strocov, G. E. Cirlin, V. A. Egorov, N. K. Polyakov, Yu. B. Samsonenko, D. V. Denisov, V. M. Ustinov und Zh. I. Alferov
Stoichiometry and absolute atomic concentration profiles obtained by combined Rutherford backscattering spectroscopy and secondary-ion mass spectroscopy: InAs nanocrystals in Si
Nanotechnology 13, 631-634 (2002)
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Helmut Karl, Ingo Großhans, Wilfried Attenberger, Markus Schmid und Bernd Stritzker
Buried ZnTe nanocrystallites in thermal SiO2 on silicon synthesized by high dose ion implantation
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 178, 126-130 (2001)
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Axel Wenzel, Helmut Karl und Bernd Rauschenbach
Distribution of ion implanted dopants in Gallium Nitride
in: Ion implantation technology 2000: 2000 International Conference on Ion Implantation Technology; proceedings, Alpbach, Austria, 17-22 September 2000, hrsg. von Heiner Ryssel, Lothar Frey, Jozsef Gyulai und Hans Glawsichnig, 99-102 (IEEE: Piscataway, NJ, 2000)
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B. Avenhaus, A. Porch, M. J. Lancaster, S. Hensen, M. Lenkens, S. Orbach-Werbig, G. Müller, U. Dähne, N. Tellmann, N. Klein, C. Dubourdieu, J. P. Senateur, O. Thomas, Helmut Karl, Bernd Stritzker, J. A. Edwards und R. Humphreys
Microwave properties of YBCO thin films
IEEE Transactions on Applied Superconductivity 5, 1737-1740 (1995)
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Ludwig Hofmann, Helmut Karl, Philipp Seng und Konrad Samwer
Hall effect measurements on YBa2Cu3O7-d-films with different oxygen deficiency
Physica B: Condensed Matter 194-196, 2161-2162 (1994)
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L. Hofmann, Philipp Seng, Helmut Karl und Konrad Samwer
Hall effect measurements on YBa2Cu3O7−δ-films with different oxygen defficiency
Physica B: Condensed Matter 194-196, 2161-2162 (1994)
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G. Dortmann, J. Erxmeyer, S. Blässer, J. Steiger, T. Paatsch, Andreas Weidinger, Helmut Karl und Bernd Stritzker
Hydrogenation of thin Y-Ba-Cu-O films: electrical transport and structure properties of YBa2Cu3O7 and YBa2Cu4O8
Physical Review B 49, 600-606 (1994)
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Helmut Karl, Josef Hartmann und Bernd Stritzker
In-plane lattice constant relaxation during laser ablation of YBCO and yttria-stabilized zirconia
Thin Solid Films 241, 84-87 (1994)
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Ludwig Hofmann, Helmut Karl und Konrad Samwer
Normal-state hall effect and resistivity measurement of YBa2Cu3Ox-films with different oxygen content
Zeitschrift für Physik B Condensed Matter 95, 173-180 (1994)
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L. Hofmann, Helmut Karl und Konrad Samwer
Normal-state hall effect and resistivity measurements of YBa2Cu3Ox-films with different oxygen content
Zeitschrift für Physik B Condensed Matter 95, 173-180 (1994)
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A. Neminsky, J. Dumas, B. P. Thrane, C. Schlenker, Helmut Karl und Bernd Stritzker
Thickness dependence of the irreversibility line in YBa2Cu3O7 epitaxial thin films
Physical Review B 50, 3307-3311 (1994)
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A. Neminsky, J. Dumas, C. Schlenker, Helmut Karl und Bernd Stritzker
Time dependent effects in the irreversibility line of YBa2Cu3O7 very thin films studied by DC magnetization
Physica C: Superconductivity 235-240, 2907-2908 (1994)
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Helmut Karl
Zeitaufgelöste in-situ-RHEED-Messungen während der Laserablation von YBa 2 Cu 3 O 7-x , SrTiO 3 und (Y 2 O 3 ) ZrO 2 und Charakterisierung der Schichten mit dem Raster-Tunnel-Mikroskop, RBS und elektrischen Methoden
(1994)
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Urspr. erschienen als Augsburg, Univ., Diss., 1994.

Helmut Karl
Zeitaufgelöste in-situ-RHEED-Messungen während der Laserablation von YBa2Cu3O7-x, SrTiO3 und (Y2O3)ZrO2 und Charakterisierung der Schichten mit dem Raster-Tunnel-Mikroskop, RBS und elektrischen Methoden
Dissertation, Universität Augsburg (Universität Augsburg: Augsburg, 1994)
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Augsburg, Univ., Diss., 1994

Helmut Karl und Bernd Stritzker
In-situ rheed studies of YBCO-film growth during pulsed laser deposition
IEEE Transactions on Applied Superconductivity 3, 1594-1597 (1993)
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Helmut Karl und Bernd Stritzker
Rheed-oscillations during pulsed laser deposition of YBCO
in: Laser ablation in materials processing: fundamentals and applications; symposium held December 1 - 4, 1992, Boston, Massachusetts, U.S.A., hrsg. von Bodil Braren, J. J. Dubowski und David P. Norton, (Materials Research Society Symposia Proceedings ; 285) 269-274 (Materials Research Society: Pittsburgh, PA, 1993)
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A. Neminsky, B. P. Thrane, J. Dumas, R. Buder, C. Schlenker, Helmut Karl, Thomas Bollmeier, Bernd Stritzker und M. Brunel
Thickness dependence of the irreversibility line in YBa2Cu3O7 thin films studied by magnetic and microwave measurements
in: Applied superconductivity [papers presented at the European Conference on Applied Superconductivity (EUCAS), October 4 - 9, 1993, Göttingen, Germany], hrsg. von H. C. Freyhardt, 1025-1028 (DGM-Informationsges.-Verl.: Oberursel, 1993)
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Helmut Karl und Bernd Stritzker
Reflection high-energy electron diffraction oscillations modulated by laser-pulse deposited YBa2Cu3O7-x
Physical Review Letters 69, 2939-2942 (1992)
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C. Ziegler, F. Baudenbacher, Helmut Karl, H. Kinder und W. Göpel
Interface analysis of the system Si/YBa2Cu3O7-x
Fresenius' Journal of Analytical Chemistry 341, 308-313 (1991)
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F. Baudenbacher, Helmut Karl, P. Berberich und H. Kinder
In-situ Rheed studies of initial growth stages of YBCO-films by thermal Co-evaporation
in: Science and Technology of Thin Film Superconductors 2, hrsg. von Robert D. McConnell und Rommel Noufi, 351-357 (Springer US: Boston, MA, 1990)
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A. Lega, Helmut Karl, W. Dietsche, A. Fischer und K. Ploog
Phonon-drag effect in GaAs-AlGaAs heterostructures by monochromatic phonons
Surface Science 229, 116-118 (1990)
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F. Baudenbacher, Helmut Karl, P. Berberich und H. Kinder
Rheed studies of epitaxial growth of YBCO-films prepared by thermal co-evaporation
Journal of the Less Common Metals 164-165, 269-278 (1990)
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Helmut Karl, W. Dietsche, A. Fischer und K. Ploog
Imaging of the phonon-drag effect in GaAs-AlGaAs heterostructures
Physical Review Letters 61, 2360-2363 (1988)
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