Chiral Spin Liquid and Quantum Criticality in Extended S=1/2 Heisenberg Models on the Triangular Lattice

2016/04/26 by Alexander Wietek, Andreas M. Läuchli · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.95.035141

published as Phys. Rev. B 95, 035141 (2017) · 6 pages, 5 figures (+ supp. mat.)

arxiv created 2016/04/26 · arxiv updated 2017/02/01

Abstract

We investigate the J₁-J₂ Heisenberg model on the triangular lattice with an additional scalar chirality term and show that a chiral spin liquid is stabilized in a sizeable region of the phase diagram. This topological phase is situated in between a coplanar 120^∘ Néel ordered and a non-coplanar tetrahedrally ordered phase. Furthermore we discuss the nature of the spin-disordered intermediate phase in the J₁-J₂ model. We compare the groundstates from Exact Diagonalization with a Dirac spin liquid wavefunction and propose a scenario where this wavefunction describes the quantum critical point between the 120^∘ magnetically ordered phase and a putative ℤ₂ spin liquid.

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