Double semion phase in an exactly solvable quantum dimer model on the kagome lattice

Oliver Buerschaper, Siddhardh C. Morampudi, Frank Pollmann

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Quantum dimer models typically arise in various low energy theories like those of frustrated antiferromagnets. We introduce a quantum dimer model on the kagome lattice which stabilizes an alternative Z2 topological order, namely the so-called "double semion" order. For a particular set of parameters, the model is exactly solvable, allowing us to access the ground state as well as the excited states. We show that the double semion phase is stable over a wide range of parameters using numerical exact diagonalization. Furthermore, we propose a simple microscopic spin Hamiltonian for which the low-energy physics is described by the derived quantum dimer model.

Original languageEnglish
Article number195148
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number19
DOIs
StatePublished - 26 Nov 2014
Externally publishedYes

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