Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-05
Phys. Rev. B 82, 075108 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages, 18 figures
Scientific paper
10.1103/PhysRevB.82.075108
We investigate the properties of a three-leg quantum spin tube using several techniques such as the density matrix renormalization group method, strong coupling approaches and the non linear sigma model. For integer spins S, the model proves to exhibit a particularly rich phase diagram consisting of an ensemble of 2S phase transitions. They can be accurately identified by the behavior of a non local string order parameter associated to the breaking of a hidden symmetry in the Hamiltonian. The nature of these transitions are further elucidated within the different approaches. We carry a detailed DMRG analysis in the specific cases S = 1. The numerical data confirm the existence of two Haldane phases with broken hidden symmetry separated by a trivial singlet state. The study of the gap and of the von Neumann entropy suggest a first order phase transition but at the close proximity of a tricritical point separating a gapless and a first order transition line in the phase diagram of the quantum spin tube.
Capponi Sylvain
Charrier Didier
Oshikawa Masaki
Pujol Pierre
No associations
LandOfFree
Quantum phase transitions in three-leg spin tubes 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 Quantum phase transitions in three-leg spin tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum phase transitions in three-leg spin tubes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-436770