Using Multidimensional Coherent Spectroscopy (MDCS), we have revealed quantum superpositions among low energy states in an optimally doped cuprate superconductor that remain coherent for more than 500fs. This observation points to a strong correlation between the low energy modes (e.g. phonons, magnons, charge density waves, or many body electron states, etc) and the optically excited states. These correlations are mediated by the many-body nature of the excitations at both energy scales [1]. These observations are supported by and contrasted with measurements on simple molecular systems where we demonstrate the ability of these experiments to acquire background free coherent Raman spectra [2].
Novelli, Tollerud, Davis, Science Advances (accepted) Arxiv:1712.03598v1
Kolesnichenko, Tollerud, Davis, APL Photonics 4, 056102 (2019); https://doi.org/10.1063/1.5090585
About the speaker
Dr Jonathan Tollerud is a FLEET alumnus, forming having worked with Jeff Davis at Swinburne University. He is now a postdoctoral researcher at the University of Trieste, Italy.