Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P24: 3D Frustrated Spin Systems: Pyrochlores and Novel Geometries
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC
Room: 403A
Sponsoring
Units:
GMAG DMP
Chair: Santiago Grigera, University of St. Andrews
Abstract ID: BAPS.2018.MAR.P24.2
Abstract: P24.00002 : The spin-1/2 Heisenberg antiferromagnet on the pyrochlore lattice: An exact diagonalisation study
2:42 PM–2:54 PM
Presenter:
V Ravi Chandra
(School of Physical Sciences, National Institute of Science Education and Research)
Authors:
V Ravi Chandra
(School of Physical Sciences, National Institute of Science Education and Research)
Jyotisman Sahoo
(Iowa State University)
antiferromagnet on the pyrochlore lattice. We study a section of the lattice in the
$[111]$ direction and analyse the Hamiltonian of the breathing pyrochlore system
with two coupling constants $J_1$ and $J_2$ for tetrahedra of different orientation
and investigate the evolution of the system from the limit of disconnected tetrahedra
($J_2 = 0$) to a correlated state at $J_1=J_2$. We evaluate the low energy spectrum,
two and four spin correlations, and spin chirality correlations for a system size of up to
36 sites. The model shows a fast decay of spin correlations and we confirm the presence
of several singlet excitations below the lowest magnetic excitation. We find chirality
correlations near $J_1=J_2$ to be small at the length scales available at this system size.
Evaluation of dimer-dimer correlations and analysis of the nature of the entanglement of
the tetrahedral unit shows that the triplet sector of the tetrahedron contributes significantly
to the ground state entanglement at $J_1 = J_2$.
Reference : V. R. Chandra and J. Sahoo, arXiv:1710.11316
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.P24.2
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