Citation Rankings
Highly Cited Researchers

Natural Sciences / Physics Highly Cited Researchers 12 Scientists Citation Rankings - 2025

The Citation Rankings (Highly Cited Researchers) list highlight the most cited and influential researchers across a vast range of scientific fields, covering 197 main and sub-disciplines, including the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings. This service, offered exclusively by AD Scientific Index, aims to provide a balanced perspective by excluding data from CERN and other statistical sources that disproportionately favor certain researchers, particularly in the social sciences and humanities. This unique approach addresses the advantages researchers with multi-author publications and CERN involvement hold over others. Furthermore, citation rankings help uncover rule violations and unethical practices within the research community. For more detailed citation analyses, explore the Scientists Last 6 Years Citation Index, Universities Total Citations Rankings 2025, and Universities Last 6 Years Citations Rankings 2025.

* Total Citation Counts Rankings
Ranking Based On Selection: 1
South Africa
HC Swart
nanophosphors
luminescence
cathodoluminescence
surface characterization
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
27,167
16,807
0.619
* Total Citation Counts Rankings
Ranking Based On Selection: 2
South Africa
Petrus Johannes Meintjes
Physics
Astrophysics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,834
8,214
0.554
* Total Citation Counts Rankings
Ranking Based On Selection: 3
South Africa
Francis Birhanu Dejene
Condensed Matter Physics
Renewable Energy
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,513
2,224
0.633
* Total Citation Counts Rankings
Ranking Based On Selection: 4
South Africa
Elizabeth Coetsee
Physics
Semiconductors
Phosphors
Solar Cells
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,902
1,642
0.566
* Total Citation Counts Rankings
Ranking Based On Selection: 5
South Africa
Lehlohonolo Koao
Solid state Physics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,403
1,015
0.723
* Total Citation Counts Rankings
Ranking Based On Selection: 6
South Africa
Mart-Mari Duvenhage
Physics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,324
814
0.615
* Total Citation Counts Rankings
Ranking Based On Selection: 7
South Africa
Ro Ocaya|Richard Opio Ocaya
Nanoscience and Nanotechnology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
851
514
0.604
* Total Citation Counts Rankings
Ranking Based On Selection: 8
South Africa
Ashwini Kumar Sharma
Luminescencet Materials
Upconversion Nanophosphors
Solid state lighting
Crystallography
Solar Cell Technology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
752
560
0.745
* Total Citation Counts Rankings
Ranking Based On Selection: 9
South Africa
Sumedha Tamboli
Luminescence
Material Science
Solid State Physics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
461
373
0.809

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* Total Citation Counts Rankings
Ranking Based On Selection: 10
South Africa
Mubarak Yagoub
Experimental Condensed matter physics
Luminescent Materials
optoelectronics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
392
257
0.656
* Total Citation Counts Rankings
Ranking Based On Selection: 11
South Africa
Achamyeleh G. Mengistu
Agriculture
Soil Physics
Watershed Management
Environment
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
287
271
0.944
* Total Citation Counts Rankings
Ranking Based On Selection: 12
South Africa
Ljb Erasmus
Physics. phosphors
luminescence
solar cells
light emitting diodes
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
266
226
0.850
* Total Citation Counts Rankings
Rankings
26,700
South Africa
74
1
Ranking Based On Selection: 1
HC Swart
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
27,167
16,807
0.619
nanophosphors
luminescence
cathodoluminescence
surface characterization
* Total Citation Counts Rankings
Rankings
62,023
South Africa
210
3
Ranking Based On Selection: 2
Petrus Johannes Meintjes
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14,834
8,214
0.554
* Total Citation Counts Rankings
Rankings
287,899
South Africa
1,256
26
Ranking Based On Selection: 3
Francis Birhanu Dejene
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,513
2,224
0.633
Condensed Matter Physics
Renewable Energy
* Total Citation Counts Rankings
Rankings
337,567
South Africa
1,522
33
Ranking Based On Selection: 4
Elizabeth Coetsee
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,902
1,642
0.566
Physics
Semiconductors
Phosphors
Solar Cells
* Total Citation Counts Rankings
Rankings
566,487
South Africa
2,802
65
Ranking Based On Selection: 5
Lehlohonolo Koao
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,403
1,015
0.723
* Total Citation Counts Rankings
Rankings
586,816
South Africa
2,925
69
Ranking Based On Selection: 6
Mart-Mari Duvenhage
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,324
814
0.615
* Total Citation Counts Rankings
Rankings
744,689
South Africa
3,846
102
Ranking Based On Selection: 7
Ro Ocaya|Richard Opio Ocaya
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
851
514
0.604
* Total Citation Counts Rankings
Rankings
787,790
South Africa
4,117
113
Ranking Based On Selection: 8
Ashwini Kumar Sharma
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
752
560
0.745
Luminescencet Materials
Upconversion Nanophosphors
Solid state lighting
Crystallography
Solar Cell Technology
* Total Citation Counts Rankings
Rankings
962,974
South Africa
5,333
149
Ranking Based On Selection: 9
Sumedha Tamboli
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
461
373
0.809
Luminescence
Material Science
Solid State Physics
* Total Citation Counts Rankings
Rankings
1,029,199
South Africa
5,889
170
Ranking Based On Selection: 10
Mubarak Yagoub
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
392
257
0.656
Experimental Condensed matter physics
Luminescent Materials
optoelectronics

360° Institutional Performance & Benchmarking Click Here for Live Demo 

Gain data-driven strategic insights into your institution’s academic performance, global positioning, and competitive strengths through advanced analysis and benchmarking

with 20 similarly ranked institutions at City, Country, Region, and Global levels. 

* Total Citation Counts Rankings
Rankings
1,156,735
South Africa
6,962
211
Ranking Based On Selection: 11
Achamyeleh G. Mengistu
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
287
271
0.944
Agriculture
Soil Physics
Watershed Management
Environment
* Total Citation Counts Rankings
Rankings
1,189,315
South Africa
7,257
221
Ranking Based On Selection: 12
Ljb Erasmus
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
266
226
0.850
Physics. phosphors
luminescence
solar cells
light emitting diodes