Novel local symmetries and chiral-symmetry-broken phases in S=(1/2 triangular-lattice Heisenberg model
G Baskaran - Physical Review Letters, 1989 - APS
Physical Review Letters, 1989•APS
Using a non-mean-field approach the triangular lattice S=(1/2 Heisenberg antiferromagnet
with nearest-and next-nearest-neighbor coupling is shown to undergo an Ising-type phase
transition into a chiral symmetry broken phase (Kalmeyer-Laughlin–like state) at small T.
Removal of next-nearest-neighbor coupling introduces a local Z 2 symmetry, thereby
suppressing any finite-T chiral order.
with nearest-and next-nearest-neighbor coupling is shown to undergo an Ising-type phase
transition into a chiral symmetry broken phase (Kalmeyer-Laughlin–like state) at small T.
Removal of next-nearest-neighbor coupling introduces a local Z 2 symmetry, thereby
suppressing any finite-T chiral order.
Abstract
Using a non-mean-field approach the triangular lattice S=(1/2 Heisenberg antiferromagnet with nearest-and next-nearest-neighbor coupling is shown to undergo an Ising-type phase transition into a chiral symmetry broken phase (Kalmeyer-Laughlin–like state) at small T. Removal of next-nearest-neighbor coupling introduces a local Z 2 symmetry, thereby suppressing any finite-T chiral order.
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