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2-D Terahertz Spectroscopy of Cuprate Superconductors

Date : Monday, January 23rd, 2023 1:00 pm - 3:00 pm Place : A632 & Zoom Lecturer : Albert Liu Affiliation : Max Planck Institute for the Structure and Dynamics of Matter Committee Chair : Masataka Kobayashi, Takeshi Suzuki (63387, 63367)
e-mail: kobayashi.masataka@issp.u-tokyo.ac.jp
Language in Speech : English and Japanese

Quantum materials, systems in which quantum effects lead to unique macroscopic phenomena with tremendous technological potential, comprise the forefront of condensed matter physics research. In particular, collective excitations associated with broken-symmetry phases have attracted tremendous attention as powerful windows into their microscopic physics and dynamics. However, spectroscopy of these collective excitations has been hindered by the so-called ‘terahertz gap’, which refers to difficulties in generation and detection of radiation in the terahertz frequency range, where many relevant modes of quantum materials are found.
In response to this challenge, we translate a technique known as 2-D spectroscopy [1], an optical analogue of multi-dimensional NMR spectroscopy, into the terahertz frequency range. We implement, for the first time, 2-D Terahertz Spectroscopy in a non-collinear, reflection geometry, enabling study of opaque materials and isolation of their constituent terahertz nonlinearities. We apply this technique to the Josephson plasma resonance [2] in La2-xSrxCuO4, a layered high-temperature superconductor, to distill the underlying plasmon correlations. Measurements of the superconducting transition provide evidence of an unconventional phase-disordering transition without pair breaking. I will conclude with an outlook for light-induced phase transitions.

[1] S. T. Cundiff and S. Mukamel, Phys. Today 66 (44), 2013.
[2] Y. Laplace and A. Cavalleri, Adv. Phys. X 1 (3), 2016.

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(Published on: Wednesday December 21st, 2022)