Quantum Colloquium – Prof. Eugene Demler
Thursday, April 25th, 11:00am
60 Oxford Street, Room 301
Eugene Demler, ETH Zurich
Title: Illuminating Electron Correlations
Developments in optical technology bring new modalities of probing electron systems. This
talk will review several examples of the correlated states revealed by novel optical
probes with an emphasis on the theoretical models necessary for interpreting experimental
results. We will start by discussing recent experiments in the pseudogap phase of the high
Tc cuprates that have been interpreted as the light induced Meissner effect. We will
approach this phenomenon from the perspective of nonlinear dynamics of the sine-Gordon
model triggered by the strong terahertz pump pulse. This interpretation suggests that
these experiments reveal strong superconducting correlations in the pseudogap state but do
not require photoinduced superconductivity. We will also discuss sensitive light
reflection experiments in layered materials used as probes of electronic states. Examples
include the observation of the mixed state between an electronic Wigner crystal with an
electron liquid as well as the demonstration of a new type of magnetism in moire
systems.
Guest presentation will begin promptly at 11:00 AM
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