K. Ullmann

1.1k total citations · 1 hit paper
21 papers, 682 citations indexed

About

K. Ullmann is a scholar working on Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics and Radiation. According to data from OpenAlex, K. Ullmann has authored 21 papers receiving a total of 682 indexed citations (citations by other indexed papers that have themselves been cited), including 13 papers in Atomic and Molecular Physics, and Optics, 5 papers in Statistical and Nonlinear Physics and 4 papers in Radiation. Recurrent topics in K. Ullmann's work include Atomic and Molecular Physics (6 papers), Quantum chaos and dynamical systems (5 papers) and Graphene research and applications (4 papers). K. Ullmann is often cited by papers focused on Atomic and Molecular Physics (6 papers), Quantum chaos and dynamical systems (5 papers) and Graphene research and applications (4 papers). K. Ullmann collaborates with scholars based in Germany, Brazil and United States. K. Ullmann's co-authors include Heiko B. Weber, Takuya Higuchi, Christian Heide, Peter Hommelhoff, Iberê L. Caldas, A. J. Lichtenberg, Gilberto Corso, Michael Thoss, H. Schmidt‐Böcking and Pedro B. Coto and has published in prestigious journals such as Nature, SHILAP Revista de lepidopterología and Nano Letters.

In The Last Decade

K. Ullmann

21 papers receiving 666 citations

Hit Papers

Light-field-driven currents in graphene 2017 2026 2020 2023 2017 50 100 150 200 250
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Light-field-driven currents in graphene
    2017 298 citations Takuya Higuchi, Christian Heide et al. Nature profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
K. Ullmann Germany 11 452 180 175 139 103 21 682
G. Piccitto Italy 13 389 0.9× 78 0.4× 91 0.5× 94 0.7× 142 1.4× 46 597
N. H. Kwong United States 23 1.4k 3.0× 346 1.9× 123 0.7× 120 0.9× 98 1.0× 97 1.5k
S. Ooi Japan 21 827 1.8× 138 0.8× 141 0.8× 65 0.5× 118 1.1× 132 1.8k
J. Nagel Germany 11 347 0.8× 92 0.5× 112 0.6× 71 0.5× 33 0.3× 32 523
K. A. H. van Leeuwen Netherlands 16 819 1.8× 103 0.6× 34 0.2× 222 1.6× 40 0.4× 56 907
A. Majhofer Poland 15 267 0.6× 40 0.2× 187 1.1× 64 0.5× 157 1.5× 30 618
Igor Makasyuk United States 13 894 2.0× 202 1.1× 39 0.2× 711 5.1× 94 0.9× 29 1.1k
D. Weiner United States 11 435 1.0× 211 1.2× 55 0.3× 29 0.2× 178 1.7× 32 663
G. L. Braglia Italy 17 436 1.0× 380 2.1× 97 0.6× 154 1.1× 14 0.1× 74 770
Stefan Wehinger United States 4 605 1.3× 116 0.6× 133 0.8× 54 0.4× 15 0.1× 7 805

Countries citing papers authored by K. Ullmann

Since Specialization
Citations

This map shows the geographic impact of K. Ullmann's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by K. Ullmann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites K. Ullmann more than expected).

Fields of papers citing papers by K. Ullmann

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by K. Ullmann. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by K. Ullmann. The network helps show where K. Ullmann may publish in the future.

Co-authorship network of co-authors of K. Ullmann

This figure shows the co-authorship network connecting the top 25 collaborators of K. Ullmann. A scholar is included among the top collaborators of K. Ullmann based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with K. Ullmann. K. Ullmann is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Hall, S. R. & K. Ullmann. (2019). ATom: L2 Photolysis Frequencies from NCAR CCD Actinic Flux Spectroradiometers (CAFS). Oak Ridge National Laboratory Distributed Active Archive Center for Biogeochemical Dynamics. 1 indexed citations
2.
Heide, Christian, Takuya Higuchi, K. Ullmann, Heiko B. Weber, & Peter Hommelhoff. (2019). Lightwave-controlled electron dynamics in graphene. SHILAP Revista de lepidopterología. 205. 5002–5002. 3 indexed citations
3.
Higuchi, Takuya, Christian Heide, K. Ullmann, Heiko B. Weber, & Peter Hommelhoff. (2018). Landau-Zener-Stückelberg interferometer on attosecond timescales in graphene. 34–34. 3 indexed citations
4.
Coto, Pedro B., et al.. (2017). Charge transport in C60-based single-molecule junctions with graphene electrodes. Nanoscale. 9(21). 7217–7226. 8 indexed citations
5.
Higuchi, Takuya, Christian Heide, K. Ullmann, Heiko B. Weber, & Peter Hommelhoff. (2017). Light-field-driven currents in graphene. Nature. 550(7675). 224–228. 298 indexed citations breakdown →
6.
Ullmann, K., Pedro B. Coto, Agustín Molina‐Ontoria, et al.. (2015). Single-Molecule Junctions with Epitaxial Graphene Nanoelectrodes. Nano Letters. 15(5). 3512–3518. 71 indexed citations
7.
Hertel, Stefan, Johannes Jobst, Christian Steiner, et al.. (2014). Gateless patterning of epitaxial graphene by local intercalation. Nanotechnology. 26(2). 25302–25302. 9 indexed citations
8.
Waldmann, Daniel, Benjamin Butz, Sebastian Bauer, et al.. (2013). Robust Graphene Membranes in a Silicon Carbide Frame. ACS Nano. 7(5). 4441–4448. 15 indexed citations
9.
Schmidt‐Böcking, H., V. Mergel, L. Ph. H. Schmidt, et al.. (2003). Dynamics of ionization processes studied with the COLTRIMS method—new insight into e–e correlation. Radiation Physics and Chemistry. 68(1-2). 41–50. 8 indexed citations
10.
Caldas, Iberê L., et al.. (2002). Control of chaotic magnetic fields in tokamaks. Brazilian Journal of Physics. 32(4). 25 indexed citations
11.
Ullmann, K. & Iberê L. Caldas. (2000). A symplectic mapping for the ergodic magnetic limiter and its dynamical analysis. Chaos Solitons & Fractals. 11(13). 2129–2140. 39 indexed citations
12.
Ullmann, K., A. J. Lichtenberg, & Gilberto Corso. (2000). Energy equipartition starting from high-frequency modes in the Fermi-Pasta-Ulam β oscillator chain. Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics. 61(3). 2471–2477. 49 indexed citations
13.
Ali, I, R. Dörner, O. Jagutzki, et al.. (1999). Multi-hit detector system for complete momentum balance in spectroscopy in molecular fragmentation processes. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 149(4). 490–500. 57 indexed citations
14.
Ullmann, K. & Iberê L. Caldas. (1996). Transitions in the parameter space of a periodically forced dissipative system. Chaos Solitons & Fractals. 7(11). 1913–1921. 6 indexed citations
15.
Bräuning, H., A. Breskin, R. Chechik, et al.. (1994). A large volume 3D imaging gas scintillation counter with CsI-based wire chamber readout. Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment. 348(2-3). 223–227. 13 indexed citations
16.
Ullrich, J., R. Dörner, O. Jagutzki, et al.. (1993). Recoil-ion momentum spectroscopy (RIMS). Radiation effects and defects in solids. 126(1-4). 77–82. 2 indexed citations
17.
Kelbch, C., R. Koch, S. Hagmann, et al.. (1992). Delta-electron emission in fast heavy ion — atom collisions: observations of new phenomena and breakdown of common scaling laws. Zeitschrift für Physik D Atoms Molecules and Clusters. 22(4). 713–721. 11 indexed citations
18.
Ullrich, J., R. Dörner, R. E. Olson, et al.. (1992). Dynamic mechanisms of He single ionization by fast proton impact. Physical Review A. 45(7). 4572–4575. 32 indexed citations
19.
Bräuning, H., et al.. (1991). Influence of the recoil effect in TiK-shell ionization probabilities. Physical Review A. 44(5). 2868–2873. 1 indexed citations
20.
Dörner, R., J. Ullrich, R. E. Olson, et al.. (1991). Multiple ionization collisions dynamics in 10 MeV F6+on Ne collisions. Journal of Physics B Atomic Molecular and Optical Physics. 24(16). 3613–3620. 7 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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