Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Focus Session: Nonlinear Spectroscopy of Collective Excitations in Quantum Magnets (joint session TT/MA)
MA 24.1: Topical Talk
Mittwoch, 19. März 2025, 09:30–10:00, H36
Detecting Anyons Using Nonlinear Pump-Probe Spectroscopy — •Max McGinley1,2, Michele Fava2, and Sid Parameswaran2 — 1Cambridge University, UK — 2Oxford University, UK
Topologically ordered two-dimensional systems can host excitations that possess statistics that interpolate between bosonic and fermionic—so called anyons. In this talk, I will explain how the presence of such anyonic excitations can be inferred from nonlinear spectroscopic quantities. In particular, we consider pump-probe spectroscopy, where a sample is irradiated by two light pulses with an adjustable time delay between them. The relevant response coefficient exhibits a universal form that originates from the statistical phase acquired when anyons created by the first pulse braid around those created by the second. This behaviour is shown to be qualitatively unchanged by non-universal physics including non-statistical interactions and small finite temperatures. In magnetic systems, the signal of interest can be measured using currently available terahertz-domain probes, highlighting the potential usefulness of nonlinear spectroscopic techniques in the search for quantum spin liquids. I will discuss future prospects for inferring properties of collective excitations using analogous techniques.
Keywords: Nonlinear spectroscopy; Quantum spin liquids; Anyons; Pump-probe spectroscopy