Center for Bright Beams Post-doctoral Research Associate
Project - Near-threshold Photoemission Electron Spectroscopy
Background and Description –
The Center for Bright Beams (CBB) is a multi-institutional NSF funded Science and Technology Center based at Cornell University with the goal of developing orders of magnitude brighter electron beams that will transform various electron beam applications such as Free Electron Lasers and Ultrafast Electron Microscopes. For such applications, the brightness of electron beams (phase space charge density) is limited by the source of electrons (the photo-emitter) or, more specifically, by the momentum spread of the emitted electrons along the direction parallel to the emission surface . Smallest transverse momentum spreads are achieved when electrons are emitted using photon energies very close to the photoemission threshold. However, the physics of photoemission at the photoemission threshold remains elusive.
The goal of this project is to investigate the physics of photoemission close to the photoemission threshold and apply it to develop materials that can deliver brighter electron beams. While being located at Arizona State University in Tempe, the successful candidate is expected to work collaboratively with researchers at various CBB participating institutes including Cornell University, UCLA and the Lawrence Berkeley National Lab to develop novel diagnostics to measure extremely low energy (meV scale) angle resolved photoelectron distributions, use these diagnostics to study novel photoemission phenomena that occur very close to the photoemission threshold and finally utilize these effectively to design photo-emitters capable of delivering brighter electron beams. Phenomena relating to the breakdown of the sudden approximation, many-body effects (electron-phonon-photon/ two-photon emission) are of particular interest.
 Advances in bright electron sources, P. Musumeci et al, Nucl. Instrum. Methods Phys. Res. A (2018) https://doi.org/10.1016/j.nima.2018.03.019
A Ph.D. or an equivalent degree in experimental physics, material science, or chemistry is required. The candidate should have a demonstrated track record of effectively communicating research through conference presentations and/or journal papers.
Desired skills and Experience –
Candidates with one or more of the skills below will be preferred:
- · Expertise in UHV surface science techniques.
- · Experience in angle resolved photo-electron spectroscopy (ARPES) or other kinds of electron spectroscopies applied to modern materials physics problems
- · Experience in using fsec-psec pulsed lasers and harmonic generation.
- · Demonstrated ability of successfully working in a group.
Applications should be submitted above in one complete attachment. Please include a cover letter, a CV, a publication list, and a detailed summary of research experience and interests, and 3 references. For information about the position, contact the selection committee chair Prof. Siddharth Karkare, Department of Physics, Arizona State University via email at firstname.lastname@example.org.
The position is currently open and a suitable candidate would be expected to start as soon as possible.