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Two-dimensional coherent spectroscopy: concepts and opportunities for strongly-correlated electronic systems

日程 : 2020年7月9日(木) 10:30 - 12:00 場所 : https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants) 講師 : Yuan Wan 所属 : Institute of Physics, Chinese Academy of Sciences 世話人 : 押川正毅 (63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

Two-dimensional coherent spectroscopy (2DCS) is a powerful experimental technique that probes the nonlinear optical response of materials. In essence, the traditional “1D” spectroscopy, which measures the linear response, reveals the excitations in a system, whereas the 2DCS unveils the interplay between these excitations. The 2DCS in the infrared frequency range has been widely used in chemistry and biology to unravel the complex structure of molecules. The advent of tetrahertz 2DCS makes it now possible to apply this technique to solid state systems and, in particular, strongly correlated electronic systems. In this talk, I will give an exposition to the basic concepts of the 2DCS and demonstrate theoretically its potential utilities in quantum spin systems. Specifically, I will show that the 2DCS can resolve the “spinon continuum” from the gapped fractional excitations. For the Luttinger spin liquid, the 2DCS can directly reveal the coherent propagation of the gapless phonon modes. Finally, I will briefly discuss some of the challenges in the development of 2DCS theory.

Chair: Eun-Gook Moon


備考 : This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home
(公開日: 2020年07月01日)