The goal of this project is to record the dynamics of the electron-phonon (e-ph) interaction in real time by resonant selective excitation of a given phonon mode and following the response with a time-delayed femtosecond photo-ionization probe pulse, in an idealized system of atomic clusters. In this way we aim to make a movie of the energy flow from a phonon into the electron system after its excitation. The e-ph coupling is a fundamental quantity that enters in any description of condensed matter. Recently, the role of the electron-phonon coupling is a subject of hot debate in for example, superconductivity of the iron-containing pnictides, conductivity of graphene, and in the ultrafast magnetization dynamics. In smaller systems such as atomic clusters, moreover, this interaction plays a dominating role in the overall properties. In such clusters, we can selectively excite a given phonon (vibrational) mode and follow its influence on the electron system via the changes of the ionization cross-section as a function of probe polarization, wavelength, and time delay. The measured interaction strength will also be crucial in understanding many-body phenomena in solids, for design of novel materials, and for such applications as charge- and heat transport on nanoscale as well as laser ablation and processing of materials.

Requirements (PhD projects)

For these challenging projects, we are looking for enthusiastic physicists (M.Sc. or equivalent level) with affinity for experimental physics and an interest in optics. Experience with (one of) the following experimental techniques is required: nanomagnetism, ultrafast lasers, X-ray or UHV techniques. Good knowledge of English, both written and oral, is compulsory.

Conditions of employment

When filling a PhD position at the Radboud University Nijmegen, you will get a contract for 4 years. During the first year the salary is approximately 2040 euro brutto per month, increasing to about 2600 euro brutto during the fourth year.

People interested in these positions should send their letter of application and CV to
Dr. A. Kirilyuk (a.kirilyuk@science.ru.nl)
or Dr. J.M. Bakker (jmbakker@rijnh.nl).