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Presented By: CM-AMO Seminars

CM-AMO Seminar | Raman Scattering, A PostPandemic Tool for Quantum Materials

Ken Burch (Boston College)

Raman scattering, invented at the end of the last pandemic, can provide a wealth of information on the fractional, magnetic, lattice, and charge excitations at the heart of quantum materials and devices. I will begin with a brief overview of the key issues in quantum materials and the unique ability of Raman to address them. I will then focus on our recent discovery of a new quasi-particle, the Axial Higgs Mode via Quantum interference. Here, we studied a material where the electrons self-organize into a crystal lattice distinct from the material in which they live. This charge density wave has a collective mode, similar to the optical phonon in standard materials. By carefully monitoring the Raman response for different symmetries, we revealed quantum interference in the Raman process resulting from the magnetic moment of the Higgs mode of this charge density wave. This demonstrates the power of Raman to reveal the vector properties of a low energy mode and heralds the discovery of the first unconventional charge density wave and multi-component symmetry-breaking transition. Time permitting, I will discuss our efforts to use quantum materials in biosensing to help prevent the next pandemic.

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