Steven Hoekstra


Contact

I am an experimental physicist specialised in the development and application of precision measurement techniques to explore the limits of particle physics. In my group we perform experiments with small quantum systems (atoms, ions, molecules) and nanoparticles. The main tools we use to study these particles are lasers, and external electric and magnetic fields. The experiments we do are typically in a very well controlled environment, shielded from all unwanted background. By doing this, the subtle effects of quantum physics become visible, and we can use these atoms, ions, molecules and nanoparticles for a range of exciting experiments. 
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There are currently various possibilities for master research projects in my group, to start in september 2022. Also, there are openings for PhD positions, and postdocs.  Contact me if you are interest to talk about possibilities!

Projects


NL-eEDM


Our research program to measure the electron's electric dipole moment using a cold, slow and intense beam of BaF molecules


Levitated nanospheres


We optically levitate and cool nanospheres, to explore their use as sensitive sensors.

Publications


Electric dipole moments and the search for new physics


Ricardo Alarcon, et al


arXiv, 2022


Benchmarking of the Fock-space coupled-cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF


The NL-eEDM collaboration:, Malika Denis, Pi A B Haase, Maarten C Mooij, Yuly Chamorro, Parul Aggarwal, Hendrick L Bethlem, Alexander Boeschoten, Anastasia Borschevsky, Kevin Esajas, Yongliang Hao, Steven Hoekstra, Joost W F van Hofslot, Virginia R Marshall, Thomas B Meijknecht, Rob G E Timmermans, Anno Touwen, Wim Ubachs, Lorenz Willmann, Yanning Yin


Physical Review A, 2022, p. 052811


A supersonic laser ablation beam source with narrow velocity spreads


P. Aggarwal, H. L. Bethlem, A. Boeschoten, A. Borschevsky, K. Esajas, Y. Hao, S. Hoekstra, K. Jungmann, V. R. Marshall, T. B. Meijknecht, M. C. Mooij, R. G. E. Timmermans, A. Touwen, W. Ubachs, L. Willmann, Y. Yin, A. Zapara


Review of Scientific Instruments, 2021, p. 033202


Deceleration and Trapping of SrF Molecules


P. Aggarwal, Y. Yin, K. Esajas, H. L. Bethlem, A. Boeschoten, A. Borschevsky, S. Hoekstra, K. Jungmann, V. R. Marshall, T. B. Meijknecht, M. C. Mooij, R. G. E. Timmermans, A. Touwen, W. Ubachs, L. Willmann


Physical Review Letters, 2021, p. 173201


Systematic study and uncertainty evaluation of P, T-odd molecular enhancement factors in BaF


Pi A B Haase, Diewertje J Doeglas, Alexander Boeschoten, Ephraim Eliav, Miroslav Iliaš, Parul Aggarwal, H L Bethlem, Anastasia Borschevsky, Kevin Esajas, Yongliang Hao, Steven Hoekstra, Virginia R Marshall, Thomas B Meijknecht, Maarten C Mooij, Kees Steinebach, Rob G E Timmermans, Anno P Touwen, Wim Ubachs, Lorenz Willmann, Yanning Yin, (NL-eEDM Collaboration)


The Journal of Chemical Physics, 2021, p. 034309


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Courses


Electricity and Magnetism


1st year physics, applied physics and astronomy


~340 students


Waves and Optics


2nd year physics, applied physics and astronomy


~190 students


From small to large to life


~25 students, twice a year.

Theses


Media


Our work in the media


Our work in the media