CPM Seminar

Special collective modes from spin-orbit coupling

Saurabh Maiti

Concordia University

Collective modes are dynamical excitations of the system. They are ubiquitous, sometimes unwanted and sometimes extremely useful. In this talk, I will demonstrate the novel collective-behavior in 2D systems with parity breaking spin-orbit coupling; with potential application to emerging technologies like spintronics/magnonics. These special modes, which we call the chiral-spin waves, exist without any time-reversal symmetry breaking in the system (no magnetism or externally applied field). I will discuss the properties of these modes, their propagation, their origin, their damping, and how to tune their properties with external knobs like a magnetic field. We will also see a couple of experiments that support this idea.