CEQM Seminar

Quantum phononics is an important field of research because it deals with the study of phonons (quanta of vibrational energy in materials) in the context of quantum mechanics. Since the idea of phonons possessing pseudo-angular momentum was proposed a decade ago, chiral phonons have been studied for their potential in the development of new quantum information technologies. Multiple chiral phonon responses by helicity-resolved (HR)Raman have been demonstrated.

Lunch begins at noon

Resistive switching and spintronics emerged among the leading approaches for the development of scalable and energy-efficient memories and information processing devices. In resistive switching systems, an electrical stimulus, voltage or current, programs the material’s resistivity. In spintronics, electrical signals are used to manipulate and probe the material’s magnetic configuration.

Abstract: There are two fundamentally different ways to carry out a time resolved inelastic light scattering experiment: Firstly, one can drive elementary excitations and form new photonic states of matter not intrinsic to the ground state of the investigated material. Secondly, we can quench the free energy “Mexican-Hat Potential” of order in condensed matter leading to the population of the lowest-energy stable excitation characteristic for the ordered state.

Abstract: Wave interactions are responsible for the various aspects of the behavior of different systems in nature, including processes in the oceans and atmosphere, star hydrodynamics, and even the evolution of the Universe. Spin waves (and their quanta–magnons) in magnetically ordered materials are highly nonlinear compared to, for example, phonons or photons in solids.