A. J. Ptak

595 total citations
17 papers, 472 citations indexed

About

A. J. Ptak is a scholar working on Condensed Matter Physics, Electrical and Electronic Engineering and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, A. J. Ptak has authored 17 papers receiving a total of 472 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Condensed Matter Physics, 11 papers in Electrical and Electronic Engineering and 6 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in A. J. Ptak's work include GaN-based semiconductor devices and materials (13 papers), Semiconductor materials and devices (8 papers) and Ga2O3 and related materials (6 papers). A. J. Ptak is often cited by papers focused on GaN-based semiconductor devices and materials (13 papers), Semiconductor materials and devices (8 papers) and Ga2O3 and related materials (6 papers). A. J. Ptak collaborates with scholars based in United States, India and Finland. A. J. Ptak's co-authors include T. H. Myers, Lucia Romano, John E. Northrup, Katherine S. Ziemer, C.D. Stinespring, Chris G. Van de Walle, R. N. Kini, A. Mascarenhas, N. C. Giles and Simona Moldovan and has published in prestigious journals such as Applied Physics Letters, Journal of Applied Physics and Physical Review B.

In The Last Decade

A. J. Ptak

17 papers receiving 458 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
A. J. Ptak United States	12	391	238	188	179	158	17	472
S. Tottori Japan	7	443 1.1×	168 0.7×	206 1.1×	213 1.2×	170 1.1×	10	489
Koji Uematsu Japan	5	506 1.3×	214 0.9×	238 1.3×	274 1.5×	151 1.0×	5	547
Veit Hoffmann Germany	14	441 1.1×	273 1.1×	222 1.2×	197 1.1×	235 1.5×	44	585
Hiroya Kimura Japan	5	429 1.1×	164 0.7×	209 1.1×	232 1.3×	135 0.9×	6	459
R. C. Tu Taiwan	11	312 0.8×	168 0.7×	222 1.2×	142 0.8×	179 1.1×	30	424
D. A. Stocker United States	8	359 0.9×	160 0.7×	191 1.0×	169 0.9×	103 0.7×	11	393
Kensaku Motoki Japan	6	559 1.4×	245 1.0×	257 1.4×	284 1.6×	160 1.0×	6	603
H. Jönen Germany	14	462 1.2×	144 0.6×	215 1.1×	202 1.1×	253 1.6×	24	522
O. H. Nam South Korea	10	337 0.9×	203 0.9×	170 0.9×	111 0.6×	142 0.9×	15	425
Takuji Okahisa Japan	7	644 1.6×	249 1.0×	301 1.6×	335 1.9×	223 1.4×	8	686

Countries citing papers authored by A. J. Ptak

Since Specialization

Citations

This map shows the geographic impact of A. J. Ptak'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 A. J. Ptak with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites A. J. Ptak more than expected).

Fields of papers citing papers by A. J. Ptak

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by A. J. Ptak. 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 A. J. Ptak. The network helps show where A. J. Ptak may publish in the future.

Co-authorship network of co-authors of A. J. Ptak

This figure shows the co-authorship network connecting the top 25 collaborators of A. J. Ptak. A scholar is included among the top collaborators of A. J. Ptak 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 A. J. Ptak. A. J. Ptak is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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17 of 17 papers shown

Ptak, A. J., et al.. (2014). Coherent acoustic phonon generation in GaAs1−xBix. Applied Physics Letters. 104(9). 3 indexed citations

Ptak, A. J., et al.. (2014). Resonant state due to Bi in the dilute bismide alloyGaAs1−xBix. Physical Review B. 90(16). 12 indexed citations

Norman, Andrew G., P. Dippo, Helio Moutinho, John Simon, & A. J. Ptak. (2012). Coincident site lattice-matched InGaN on (111) spinel substrates. Applied Physics Letters. 100(15). 152106–152106. 5 indexed citations

Fluegel, B., R. N. Kini, A. J. Ptak, et al.. (2011). Shubnikov-de Haas measurement of electron effective mass in GaAs1−xBix. Applied Physics Letters. 99(16). 21 indexed citations

Kini, R. N., A. Mascarenhas, Ryan M. France, & A. J. Ptak. (2008). Low temperature photoluminescence from dilute bismides. Journal of Applied Physics. 104(11). 5 indexed citations

Oye, Michael M., G. A. Hallock, Seth R. Bank, et al.. (2007). Effects of different plasma species (atomic N, metastable N2*, and ions) on the optical properties of dilute nitride materials grown by plasma-assisted molecular-beam epitaxy. Applied Physics Letters. 91(19). 13 indexed citations

Oila, J., et al.. (2004). Vacancy defects in O-doped GaN grown by molecular-beam epitaxy: The role of growth polarity and stoichiometry. Applied Physics Letters. 84(24). 4887–4889. 20 indexed citations

Kurtz, Sarah, John F. Geisz, B. M. Keyes, et al.. (2003). Effect of growth rate and gallium source on GaAsN. Applied Physics Letters. 82(16). 2634–2636. 35 indexed citations

Ptak, A. J., Sarah Kurtz, Steve Johnston, et al.. (2003). Defects in GaInNAs: What We've Learned So Far. University of North Texas Digital Library (University of North Texas). 8 indexed citations

10.

Ptak, A. J., Ting Liu, C. H. Swartz, et al.. (2001). Controlled oxygen doping of GaN using plasma assisted molecular-beam epitaxy. Applied Physics Letters. 79(17). 2740–2742. 53 indexed citations

11.

Ptak, A. J., et al.. (2001). Incorporation-related structural issues for beryllium doping during growth of GaN by rf-plasma molecular-beam epitaxy. Applied Physics Letters. 79(27). 4524–4526. 19 indexed citations

12.

Ptak, A. J., T. H. Myers, Lucia Romano, Chris G. Van de Walle, & John E. Northrup. (2001). Magnesium incorporation in GaN grown by molecular-beam epitaxy. Applied Physics Letters. 78(3). 285–287. 76 indexed citations

13.

Ptak, A. J., T. H. Myers, Lijun Wang, et al.. (2000). A Comparison of Magnesium and Beryllium Acceptors in GaN Grown by rf-Plasma Assisted Molecular Beam Epitaxy. MRS Proceedings. 639. 9 indexed citations

14.

Romano, Lucia, John E. Northrup, A. J. Ptak, & T. H. Myers. (2000). Faceted inversion domain boundary in GaN films doped with Mg. Applied Physics Letters. 77(16). 2479–2481. 101 indexed citations

15.

Myers, T. H., A. J. Ptak, Brenda L. VanMil, et al.. (2000). Point defect modification in wide band gap semiconductors through interaction with high-energy electrons: Is reflection high-energy electron diffraction truly benign?. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena. 18(4). 2295–2299. 12 indexed citations

16.

Myers, T. H., et al.. (1999). Influence of active nitrogen species on high temperature limitations for (0001_) GaN growth by rf plasma-assisted molecular beam epitaxy. Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena. 17(4). 1654–1658. 32 indexed citations

17.

Ptak, A. J., et al.. (1999). The relation of active nitrogen species to high-temperature limitations for (0001) GaN growth by radio-frequency-plasma-assisted molecular beam epitaxy. Applied Physics Letters. 74(25). 3836–3838. 48 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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