Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-07-27
Phys. Rev. Lett. 108, 017205 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures, paper revised, references added
Scientific paper
10.1103/PhysRevLett.108.017205
We consider a spin-1/2 tube (a three-leg ladder with periodic boundary conditions) with a Hamiltonian given by two projection operators - one on the triangles, and the other on the square plaquettes on the side of the tube - that can be written in terms of Heisenberg and four-spin ring exchange interactions. We identify 3 phases: (i) for strongly antiferromagnetic exchange on the triangles, an exact ground state with a gapped spectrum can be given as an alternation of spin and chirality singlet bonds between nearest triangles; (ii) for ferromagnetic exchange on the triangles, we recover the phase of the spin-3/2 Heisenberg chain; (iii) between these two phases, a gapless incommensurate phase exists. We construct an exact ground state with two deconfined domain walls and a gapless excitation spectrum at the quantum phase transition point between the incommensurate and dimerized phase.
Lajko Miklos
Penc Karlo
Sindzingre Philippe
No associations
LandOfFree
Exact ground states with deconfined gapless excitations for the 3 leg spin-1/2 tube does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Exact ground states with deconfined gapless excitations for the 3 leg spin-1/2 tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exact ground states with deconfined gapless excitations for the 3 leg spin-1/2 tube will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-113480