Unveiling the phase diagram of a bond-alternating spin- 12 K−Γ chain

Phase diagram of the S=1/2 quantum spin chain with bond alternation.

We study the ground state properties of the bond alternating S = 1/2 quantum

The phase diagram of the anisotropic Spin-1 Heisenberg Chain

Phase diagram of the non-hermitean asymmetric XXZ spin chain

The low-lying excitations of the asymmetric XXZ spin chain are derived explicitly in the antiferromagnetic regime through the Bethe Ansatz. It is found that a massless and conformal invariant phase with central charge c = 1 is separated from a massive phase by a line on which the low-lying excitations surprisingly scale with the lattice length as ∆E ∼ N 1 2 . The mass gap vanishes with an expon...

Symmetry fractionalization: symmetry-protected topological phases of the bond-alternating spin-1/2 Heisenberg chain.

We study different phases of the one-dimensional bond-alternating spin-1/2 Heisenberg model by using the symmetry fractionalization mechanism. We employ the infinite matrix-product state representation of the ground state (through the infinite-size density matrix renormalization group algorithm) to obtain inequivalent projective representations and commutation relations of the (unbroken) symmet...

Phase diagram of the spin - 12 J 1 - J 2 Heisenberg model on a honeycomb lattice

Shou-Shu Gong,1 D. N. Sheng,1 Olexei I. Motrunich,2 and Matthew P. A. Fisher3 1Department of Physics and Astronomy, California State University, Northridge, California 91330, USA 2Department of Physics, California Institute of Technology, Pasadena, California 91125, USA 3Department of Physics, University of California, Santa Barbara, California 93106-9530, USA (Received 3 July 2013; published 2...