Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Magnetism – Spin Liquids II

TT 86.3: Vortrag

Donnerstag, 12. März 2026, 15:30–15:45, CHE/0091

Magnetization-driven spinon Landau levels and ordering instabilities in a Dirac spin liquid — Wen Wang¹, •Urban F.P. Seifert², Oleg A. Starykh³, and Leon Balents¹ — ¹Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA — ²Institute for Theoretical Physics, University of Cologne, Zülpicher Str. 77a, 50937 Cologne, Germany — ³Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA

A particularly fascinating example of a quantum spin liquid is the U(1) Dirac spin liquid (DSL), which at low energies is described by emergent quantum electrodynamics (QED3), a strongly coupled conformal field theory. Motivated by recent numerical evidence for its realization in triangular lattice J1-J2 Heisenberg antiferromagnets as well as the identification of several candidate materials, we revisit the problem of the U(1) DSL in a Zeeman magnetic field. Equipped with recent numerical and field-theoretical insights into the field-induced behaviour of the QED3 low-energy theory, we analyze a microscopic (lattice) model using Gutzwiller-projected wavefunctions. We analyze how the applied field may induce an instability towards in-plane antiferromagnetic ordering, and discuss observables that may be unique to such a field-induced state. In experiments, these may allow one to infer the presence of an underlying DSL at zero field.

Keywords: Triangular lattice; Gutzwiller-projected wavefunctions; Emergent gauge field; Quantum spin liquid; Magnetic field