Superconductivity is perhaps one of the most intriguing and heavily debated quantum phenomena in modern condensed matter physics. One, amongst the many, feature that makes it so is its ability to co-exist with many other quantum phases: like density-waves, magnets, and even rotational symmetry broken states: which is called the nematic state. Although the term originated in liquid crystals, more and more solid-state systems demonstrate such a state where the rotational symmetry is spontaneously broken (but not the translation one). Ruthenates, unconventional superconductors (Fe-based) are some of the well studied examples.
Over the years, Raman spectroscopy has positioned itself as an important tool to study symmetry breaking in quantum phases. It can not only detect the superconducting transition but also the nematic one. Further, in the more recent Fe-based superconductors, it has been demonstrated that superconductivity and nematicity can actually coexist and that there is a subtle interplay of these quantum phases. Each of these phases has its characteristic collective response. In this project, we wish to address the interplay of the two phases from the viewpoint of the collective modes in the respective states and study how the modes interact as the phases begin to coexist. Not only will this help us understand the coexistent-state better, but suggest new experiments that can identify the novel collective signatures arising from the interplay of the two orders.
Our group has developed techniques to study the collective response of unconventional superconductors, in general, and also understand their Raman spectroscopy signature. We wish to extend such techniques to include the nematic state. The main challenge involves including new interaction matrix elements in the coexistent problem. While the machinery already exists, we need motivated individuals who will tailor it to this specific problem.
Quantum and Solid state physics, familiarity with superconductivity, Familiarity with programming (C, MATLAB, Mathematica, Python).
Successful applicants will be offered financial packages consisting of RA, TA and various awards of at least 20,000 CAD per year (often more), for 4 years (PhD) or 2 years (MSc). International students will be offered tuition remissions or other awards to compensate for the international tuition fees.
Concordia Department of Physics is a growing department in a university with rapidly increasing rating. We offer research-based MSc and PhD programs. Our faculty members conduct research in the areas of Condensed Matter Physics (theoretical and experimental), Molecular Biophysics, Medical Physics / Imaging, Photonics, Theoretical High Energy Physics, Computational Physics and Physics Education.