Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: Correlated Electrons: Frustrated Magnets - Theory
TT 50.13: Talk
Wednesday, March 9, 2016, 18:30–18:45, H18
Kagome spin liquid: a deconfined critical phase driven by the gauge fluctuation — •Yin-Chen He1, Fuji Yohei1, and Subhro Bhattacharjee2 — 1Max-Planck-Institut fur Physik komplexer Systeme — 2International Centre for Theoretical Sciences, Tata Institute of Fundamental Research
Recently, new insights emerge into the celebrated problem of spin liquids on the kagome lattice: The kagome spin liquid, the ground state of the nearest neighbor Heisenberg model, survives under the extreme easy-axis anisotropy, and it is neighboring a chiral spin liquid phase. Motivated by this, we study the kagome spin liquid problem in the easy-axis limit, and reformulate it to a lattice gauge model. In this framework, we propose a new theory that, the parent state of the kagome spin liquid is a deconfined critical point, which under the U(1) gauge fluctuation gets extended into a critical phase. Besides the novelty, our theory also makes a vital connection between the seemly different subjects: topological order, critical spin liquid, symmetry protected topological phase, and deconfined criticality.