• Academic
Staff Record
Photo of Julian Berengut
Associate Professor

Julian Berengut


+61(2) 9385 7637


Honours Director (Physics)
Equity, Diversity and Inclusion Committee
ALLY@UNSW Network Contact


2000 BSc (Hons) UNSW, First Class Honours with University Medal
2006 PhD UNSW

Research Interests: 

Research topics include

  • astrophysical and laboratory searches for variations in the fundamental constants
  • searches for physics beyond the Standard Model
  • quantum mechanics in around black holes
  • development of new ultra-precise atomic clocks based on highly charged ions
  • atomic and nuclear many-body theory

I developed the atomic many-body code AMBiT, which has been instrumental in determining properties of atomic transitions such as isotope shift and sensitivity to variation of fundamental constants. It also enabled the discovery of optical transitions in highly-charged ions, which are being used to develop atomic clocks of extremely high accuracy and high sensitivity to potential variations in the fine-structure constant.

Click here for CV (pdf; 2 pages).

Honours, Awards and Memberships: 

  • 2018 Alexander von Humboldt Fellowship for Experienced Researchers
  • 2016 UNSW Rising Star
  • 2013 AIPS Young Tall Poppy Science Award
  • The 2012 Australian Museum
    Eureka Prize for Scientific Research
    Prof. John Webb, Prof. Victor Flambaum, Assoc. Prof. Michael Murphy, Dr. Julian King, and Dr. Julian Berengut
  • 2012 - 2014 ARC DECRA
  • UNSW Postdoctoral Academy Award for Best C1 HERDC Publication Rate in 2011
    for Early Career Researchers in the Faculty of Science
  • University Medal: Physics with Computer Science (2000).
    Two papers published in ERA A journals (Phys. Rev. C and D) were produced from my undergraduate honours theses. 


Selected Publications: 

Detection of the 5p - 4f orbital crossing and its optical clock transition in Pr9+,
H. Bekker, A. Borschevsky, Z. Harman, C. H. Keitel, T. Pfeifer, P. O. Schmidt, J. R. Crespo López-Urrutia, J. C. Berengut
Nature Communications 10, 5651 (2019)
AMBiT: A programme for high-precision relativistic atomic structure calculations,
E. V. Kahl, J. C. Berengut
Computer Physics Communications 238, 232 (2019)
Resonant electronic-bridge excitation of the 235U nuclear transition in ions with chaotic spectra,
J. C. Berengut
Physical Review Letters 121, 253002 (2018)
Saturated-configuration-interaction calculations for five-valent Ta and Db,
A. J. Geddes, D. A. Czapski, E. V. Kahl, J. C. Berengut,
Physical Review A 98, 042508 (2018)
Probing new long-range interactions by isotope shift spectroscopy,
J. C. Berengut, D. Budker, C. Delaunay, V. V. Flambaum, C. Frugiuele, E. Fuchs, C. Grojean, R. Harnik, R. Ozeri, G. Perez, Y. Soreq,
Physical Review Letters 120, 091801 (2018)
Precision isotope shift measurements in calcium ions using quantum logic detection schemes,
F. Gebert, Y. Wan, F. Wolf, C. N. Angstmann, J. C. Berengut, P. O. Schmidt
Physical Review Letters 115, 053003 (2015)
Identification of the predicted 5s-4f level crossing optical lines with applications to metrology and searches for the variation of fundamental constants,
A. Windberger, J. R. Crespo López-Urrutia, H. Bekker, N. S. Oreshkina, J. C. Berengut, V. Bock, A. Borschevsky, V. A. Dzuba, E. Eliav, Z. Harman, U. Kaldor, S. Kaul, U. I. Safronova, V. V. Flambaum, C. H. Keitel, P. O. Schmidt, J. Ullrich, and O. O. Versolato
Physical Review Letters 114, 150801 (2015)
Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra,
J. C. Berengut, V. V. Flambaum, A. Ong, J. K. Webb, J. D. Barrow, M. A. Barstow, S. P. Preval, J. B. Holberg,

Physical Review Letters 111, 010801 (2013)
Editor’s suggestion

Varying the light quark mass: Impact on the nuclear force and big bang nucleosynthesis,
J. C. Berengut, E. Epelbaum, V. V. Flambaum, C. Hanhart, U.-G. Meißner, J. Nebreda, J. R. Peláez,
Physical Review D 87, 085018 (2013)

Manifestations of a spatial variation of fundamental constants on atomic clocks, Oklo, meteorites, and cosmological phenomena,
J. C. Berengut and V. V. Flambaum
Europhysics Letters 97, 20006 (2012)
Electron-hole transitions in multiply-charged ions for precision laser spectroscopy and searching for variations in α,
J. C. Berengut, V. A. Dzuba, V. V. Flambaum, A. Ong
Physical Review Letters 106, 210802 (2011)
Enhanced laboratory sensitivity to variation of the fine-structure constant using highly charged ions,
J. C. Berengut, V. A. Dzuba, V. V. Flambaum
Physical Review Letters 105, 120801 (2010)
Editor’s suggestion