Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 72: Correlated Magnetism – Spin Liquids I

TT 72.2: Talk

Thursday, March 12, 2026, 09:45–10:00, HSZ/0105

The monopole plasma resonance: an opto-electronic smoking gun of 3D U(1) spin liquids — •Anish Koley, Saranyo Moitra, and Inti Sodemann Villadiego — Institut für Theoretische Physik, Universität Leipzig,04103 Leipzig, Germany

Certain 3D U(1) spin liquids, such as those arising in quantum spin ice models, have a low-energy "monopole-like" emergent particle which acts as the source of an emergent magnetic field that has the same transformations under symmetries as an electric polarization. As a consequence, these monopoles carry a polarization physical electric charge. Curiously, at finite temperatures these monopoles form a finite density plasma, but due to their coupling to emergent gauge fields, the full physical system behaves as an electrical insulator from the point of view of DC transport. Remarkably, however, we have found that when the system is probed at finite frequencies, the monopoles can display a sharp and low frequency plasma resonance analogous to a metal. This offers a new blueprint to experimentally detect these elusive but fascinating states in real materials.

Keywords: Quantum Spin Ice; Emergent magnetic monopole; Gauge fields; Plasma frequency; Drude conductivity