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TT: Fachverband Tiefe Temperaturen

TT 27: Focus Session: Nonlinear Spectroscopy of Collective Excitations in Quantum Magnets (joint session TT/MA)

Wednesday, March 19, 2025, 09:30–12:45, H36

In recent years, significant progress has been made in understanding strongly correlated quantum magnets, with a particular focus on fractionalized states of matter such as quantum spin liquids. These achievements in understanding have been made possible by remarkable developments in both materials science and experimental techniques. In particular, improvements in both traditional experimental tools (e.g., inelastic neutron scattering, Raman scattering, resonant X-ray scattering, etc.) and the introduction of innovative techniques such as 2D coherent THz spectroscopy and sophisticated noise experiments have advanced studies of quantum matter to qualitatively new levels of insight. This focus session will discuss these recent advancements in nonlinear spectroscopy techniques along with theoretical inroads in describing the nonlinear spectroscopic signatures of complex quantum magnets.

Organizers: Simon Trebst (Universität zu Köln), Johannes Knolle (TU München)

	09:30	TT 27.1	Topical Talk: Detecting Anyons Using Nonlinear Pump-Probe Spectroscopy — •Max McGinley, Michele Fava, and Sid Parameswaran
	10:00	TT 27.2	Topical Talk: Two-Dimensional Nonlinear Dynamic Response of Frustrated Magnets — •Wolfram Brenig
	10:30	TT 27.3	Topical Talk: Imaging Magnetization Dynamics and Collective Spin Excitations in Compensated Magnets on Ultrafast Timescales — •Benjamin Stadtmüller
	11:00		15 min. break
	11:15	TT 27.4	Topical Talk: Revealing Dynamics of Hidden Sectors with Nonlinear Spectroscopy — •Yoshito Watanabe, Simon Trebst, and Ciarán Hickey
	11:45	TT 27.5	Topical Talk: Theory of Nonlinear Spectroscopy of Quantum Magnets — Anubhav Srivastava, •Stefan Birnkammer, GiBaik Sim, Michael Knap, and Johannes Knolle
	12:15	TT 27.6	Quantitative Prediction of the Dynamics of In-Gap States in Correlated Materials as Seen in Pump-Probe PES, XAS and RIXS Experiments: A NiO Case Study — •Sina Shokri and Maurits W. Haverkort
	12:30	TT 27.7	Higher-Order Susceptibilities in Extended Kitaev Models Computed Via Krylov-Space Based Methods — •David Kaib, Marius Möller, and Roser Valenti