Electromagnetic signatures of chiral quantum spin liquid

Abstract

Quantum spin liquid (QSL) has become an exciting topic in interacting spin systems that do not order magnetically down to the lowest experimentally accessible temperature; however, conclusive experimental evidence remains lacking. Motivated by the recent surge of theoretical and experimental interest in a half-filled Hubbard model on the triangular lattice, where chiral QSL can be stabilized, we investigate the electromagnetic signature of the chiral QSL to aid experimental detection. We systematically studied the electrical charge and orbital electrical current associated with a spinon excitation in the chiral QSL based on parton mean-field theory and unbiased density-matrix renormalization group calculations. We then calculated both longitudinal and transverse optical conductivities below the Mott gap. We also conduct quantum field theory analysis to unravel the connection between spinon excitation and emergent and physical gauge fields. Our results show that the chiral QSL phase has a clear electromagnetic response even in a Mott insulator regime, which can facilitate the experimental detection of this long-sought-after phase.

8 pages, 5 figures, contains supplementary materials (Tex file updated)

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• Kondo enabled transmutation between spinons and superconducting vortices: origin of magnetic memory in 4Hb-$\mathrm{Ta}{\mathrm{S}}_2$
• Exploring Ground States of Fermi-Hubbard Model on Honeycomb Lattices with Counterdiabaticity
• Thermal Hall response of an abelian chiral spin liquid at finite temperatures
• Multipolar multiferroics in $4d^2$/$5d^2$ Mott insulators
• Efficient optimization and conceptual barriers in variational finite Projected Entangled-Pair States
• Frustration and chirality in three-dimensional trillium lattices: Insights and Perspectives
• Quantum Spin Liquids in Weak Mott Insulators with a Spin-Orbit Coupling
• A primer on Kitaev Model: Basic aspects, material realization, and recent experiments
• Using magnetic dynamics to measure the spin gap in a candidate Kitaev material