Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 87: Frustrated Magnets: Spin Liquids
TT 87.13: Vortrag
Freitag, 22. März 2024, 12:45–13:00, H 3010
Two-dimensional spectroscopy of quantum spin ice using Husimi cacti — •Mark Potts1, Roderich Moessner1, and Owen Benton1,2 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Queen Mary University of London, London, United Kingdom
Two-dimensional coherent spectroscopy (2DCS) is a non-linear optical technique that has attracted increasing interest in the search for clear signatures of fractionalisation in exotic quantum phases of matter. Quantum spin ice is an example of such a system, hosting fractionalised spinon excitations often referred to as magnetic monopoles.
We present work analysing the possible application of 2DCS to candidate quantum spin ices as a probe of their fractionalised excitations, in a regime with strong thermal excitation of the gauge field.
In this limit, monopole dynamics are heavily constrained, and can be modelled by effective hopping on dual Husimi cacti graphs. We predict that a sharp 2DCS response can be observed using probe fields with well-defined effective pseudo-momenta when mapped to the Husimi cacti; a zero-momentum real-space probe field does not respect this condition, and so is predicted to produce a broad 2DCS signal despite the presence of fractionalised excitations. These results are supported by exact diagonalisation computations on a 32-site cluster.
Keywords: Fractionalisation; Magnetic Monopoles; Quantum Spin Ice; Non-linear spectroscopy