Quantum disorder and local modes of the fully-frustrated transverse field Ising model on a diamond chain
Coester K, Malitz W, Fey S, Schmidt KP (2013)
Publication Status: Published
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: AMER PHYSICAL SOC
Book Volume: 88
Journal Issue: 18
DOI: 10.1103/PhysRevB.88.184402
Abstract
We investigate the transverse field Ising model on a diamond chain using series expansions about the high-field limit and exact diagonalizations. For the unfrustrated case we accurately determine the quantum critical point and its expected 2d Ising universality separating the polarized and the Z(2) symmetry broken phase. In contrast, we find strong evidence for a disorder by disorder scenario for the fully-frustrated transverse field Ising model, i.e., except for the pure Ising model, having an extensive number of ground states, the system is always in a quantum disordered polarized phase. The low-energy excitations in this polarized phase are understood in terms of exact local modes of the model. Furthermore, an effective low-energy description for an infinitesimal transverse field allows us to pinpoint the quantum disordered nature of the ground state via mapping to an effective transverse field Ising chain and to determine the induced gap to the elementary effective domain wall excitation very accurately.
Authors with CRIS profile
Sebastian Fey
Professur für Theoretische Physik
Kai Phillip Schmidt
Professur für Theoretische Physik
Involved external institutions
Germany (DE)How to cite
APA:
Coester, K., Malitz, W., Fey, S., & Schmidt, K.P. (2013). Quantum disorder and local modes of the fully-frustrated transverse field Ising model on a diamond chain. Physical Review B, 88(18). https://doi.org/10.1103/PhysRevB.88.184402
MLA:
Coester, K., et al. "Quantum disorder and local modes of the fully-frustrated transverse field Ising model on a diamond chain." Physical Review B 88.18 (2013).
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