### Session Q27: Focus Session: One-dimensional Spin Chains

11:15 AM–2:15 PM, Wednesday, March 12, 2008
Morial Convention Center Room: 219

Chair: Christopher Landee, Clark University

Abstract ID: BAPS.2008.MAR.Q27.11

### Abstract: Q27.00011 : Spin Supersolid in Anisotropic Spin-One Heisenberg Chain

1:15 PM–1:27 PM

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#### Authors:

Pinaki Sengupta
(LANL)

Cristian Batista
(LANL)

We consider an $S=1$ Heisenberg chain with strong exchange ($\Delta=J_z/J_{\perp}$) and single--ion uniaxial anisotropy ($D$) in a magnetic field ($B$) along the symmetry axis. The low energy spectrum is described by an effective $S=1/2$ XXZ model that acts on two different low energy sectors for a finite range of fields. The vacuum of each sector exhibits Ising-like antiferro magnetic ordering coexisting with the finite spin stiffness obtained from the exact solution of the XXZ model. In this way, we demonstrate the existence of a spin supersolid phase. We also compute the full $\Delta-B$ quantum phase d iagram using a quantum Monte Carlo (QMC) method.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.Q27.11