PhD position - Laser cooling and trapping Helium molecules

Join the Quantum Metrology group at LaserLaB Amsterdam

This PhD project is about the first direct laser cooling and trapping of a homonuclear diatomic molecule - He₂. Precision measurements of Rydberg states will allow QED tests and provide the polarizability of He atoms for a quantum pressure standard.

We are looking for a motivated and interested PhD-student, with a degree in physics or chemistry and with experience in laser physics, spectroscopy, and/or optical technology, who wishes to work with us in the international and stimulating environment of the joint Quantum Metrology group at LaserLaB Amsterdam.

This project aims to create the first ultracold gas of a directly laser-cooled homonuclear molecule, the helium dimer He₂. Starting from a supersonic beam, novel laser slowing and cooling techniques will be employed to create a trapped dense gas of ultracold molecules. Choosing the He₂ molecule constitutes a paradigm change in the field of ultracold molecules, as it will constitute the lightest and simplest molecule ever laser-cooled. This provides a controllable, simple 4-electron system at record low temperature, allowing quantum sensing and precision measurements to test QED and to study the quantum nature of collisions with unprecedented accuracy - while being accessible to highly accurate ab initio computational methods.

During the PhD, you will engage with various aspects of experimental physics, including ultrahigh vacuum, CAD design, optics and lasers, electronics, and scientific programming. There is also the possibility to delve into the theory of molecular Rydberg states and collisions using scattering theory.

Your Profile

• Bachelor and Master in physics or chemistry
• Affinity for atomic, molecular, or optical physics
• Bright, enthusiastic, able to work well in a team, eager to learn, and enthusiastic about this intriguing project

What Do We Offer?

A challenging position in a socially engaged organisation. At VU Amsterdam, you contribute to education, research and service for a better world. And that is valuable. So in return for your efforts, we offer you:

• A salary of minimum € 3.059,00 (PhD) and maximum € 3.881,00 (PhD) gross per month in the fourth year, on a full-time basis (UFO profile PhD candidate)
• A full-time position (1.0 FTE). Your employment contract will initially last 1 year. If there is sufficient perspective, this will be extended to a total of 4 years

We also offer you attractive fringe benefits and regulations. Some examples:

• A full-time 38-hour working week comes with a holiday leave entitlement of 232 hours per year. If you choose to work 40 hours, you have 96 extra holiday leave hours on an annual basis. For part-timers, this is calculated pro rata
• 8% holiday allowance and 8.3% end-of-year bonus
• Contribution to commuting expenses
• Optional model for designing a personalized benefits package
• A wide range of sports facilities which staff may use at a modest charge

QMLA group in the Department of Physics and Astronomy

The Quantum Metrology and Laser Applications group at LaserLaB, Vrije Universiteit Amsterdam, is a very international group, consisting of some 20 strongly collaborating senior and junior scientists. The group focuses on precision measurements of atomic and molecular systems, using advanced laser techniques as well as techniques to cool the motion of atoms and molecules. For this, they use the joint infrastructure at LaserLaB, with a variety of lasers ranging from ultrastable to ultrafast, connected to atomic clocks and frequency comb lasers. The goals are to test fundamental theories of physics (like Quantum Electrodynamics), to determine fundamental constants (like the proton-electron mass ratio), and to search for physics beyond the Standard Model, such as fifth forces and extra dimensions.

Faculty of Science

Researchers and students at VU Amsterdam’s Faculty of Science tackle fundamental and complex scientific problems to help pave the way for a sustainable and healthy future. From forest fires to big data, from obesity to malnutrition, and from molecules to the moon: we cover the full spectrum of the natural sciences. Our teaching and research have a strong experimentally technical, computational and interdisciplinary nature.

We work on new solutions guided by value-driven, interdisciplinary methodologies. We are committed to research, valorisation and training socially engaged citizens of the world who will make valuable contributions to a sustainable, healthy future.

Are you interested in joining the Faculty of Science? You will join undergraduate students, PhD candidates and researchers at the biggest sciences faculty in the Netherlands. You will combine a professional focus with a broad view of the world. We are proud of our collegial working climate, characterised by committed staff, a pragmatic attitude and engagement in the larger whole. The faculty is home to over 11,000 students enrolled in 40 study programmes. It employs over 1,600 professionals spread across 10 academic departments.

Vrije Universiteit Amsterdam

Vrije Universiteit Amsterdam stands for values-driven education and research. We are open-minded experts with the ability to think freely. Maintaining an entrepreneurial perspective and concentrating on significance and humanity, we work on sustainable solutions with social impact. By joining forces, across the boundaries of disciplines, we work towards a better world for people and planet. Together we create a safe and respectful working and study climate, and an inspiring environment for education and research.

We are located on one physical campus, in the heart of Amsterdam's Zuidas business district, with excellent location and accessibility. Over 5,500 staff work at the VU and over 30,000 students attend academic education.

If you have questions, feel free to contact M. Beyer at m.beyer@vu.nl