Prof. Dmitry Reznik

Office: Duane Physics, room F-625

Lab: Duane Physics, room G-234

Welcome to time resolved Raman Spectroscopy and Neutron Scattering Lab! 

We investigate quantum materials by neutron x-ray and Raman scattering recently focusing on high temperature superconductors, materials with strong interaction between electrical and magnetic degrees of freedom, and spin-orbit systems.

In experiments the sample is illuminated by incident radiation (neutrons, x-rays, or visible and ultraviolet light) and the scattered radiation is analyzed to reveal information about the atomic structure, magnetic order, electronic spectra, and atomic vibrations. In particular, neutrons can scatter from both the atomic nuclei and from electronic spins, whereas the x-ray photons are scattered by the electronic charge density. Furthermore, wavelengths of neutrons and x-rays are of the same order of magnitude as the distances between atoms in solids, thus they are especially well suited for investigations of spatial character of excitations. Raman scattering probes energy spectra with zero momentum transfer and is complementary to neutron and x-ray scattering. Our research can be seen as moving along two thrusts: Neutron/x-ray scattering work at large facilities worldwide and Raman scattering in my lab at CU. The former is funded by the DOE, and the latter by the NSF and DARPA.

The key capability of the Raman lab is the 90fs time-resolutioncapability. This is the timescale on which energy flows between electrons and phonons as well as magnons, which makes it a poweful probe of materials relevant for quantum computing and other applications. The lab is the only one of its kind and has world’s best capabilities in terms of time-resolution, as good as the best labs in therms of energy resolution, and the ability to perform time and angle resolved photoemission measurements in collaboration with the Dessau group.