Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 1 (jointly with MA)

TT 5.7: Talk

Monday, March 16, 2015, 11:00–11:15, H 0110

Spin liquids in kagome antiferromagnets — •Yin-Chen He, Siddhardh Morampudi, and Frank Pollmann — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187, Dresden, Germany

We propose a novel approach to describe critical spin liquids for S=1/2 kagome antiferromagnets. Instead of a physical spin system, we are working on a dual model, which deals with emergent pseudo spin coupled with a compact U(1) gauge field. We show that by fractionalizing the pseudo spins one can construct a class of stable deconfined critical spin liquids. This spin liquid is very different from the traditional ones, e.g., it has two different kinds of gauge field, and cannot simply be reproduced using the traditional spinon parton approach. Further, we show that a simple mean field ansatz yields an exotic critical spin liquid phase, which is described by 16 flavors of Dirac fermions coupled with one U(1) and two Z₂ gauge fields. We also show such critical spin liquid can be the parent state of chiral and Z₂ spin liquids.