Modified spin-wave theory and spin-liquid behavior of cold bosons on an inhomogeneous triangular lattice

Alessio Celi; Tobias Grass; Andrew J. Ferris; Bikash Padhi; David Raventós; Juliette Simonet; Klaus Sengstock; Maciej Lewenstein

doi:10.1103/PhysRevB.94.075110

Modified spin-wave theory and spin-liquid behavior of cold bosons on an inhomogeneous triangular lattice

Alessio Celi, Tobias Grass, Andrew J. Ferris, Bikash Padhi, David Raventós, Juliette Simonet, Klaus Sengstock, Maciej Lewenstein

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

7 Citations (Scopus)

Abstract

Ultracold bosons in a triangular lattice are a promising candidate for observing quantum spin liquid behavior. Here we investigate, for such system, the role of a harmonic trap giving rise to an inhomogeneous density. We construct a modified spin-wave theory for arbitrary filling and predict the breakdown of order for certain values of the lattice anisotropy. These regimes, identified with the spin liquid phases, are found to be quite robust upon changes in the filling factor. This result is backed by an exact diagonalization study on a small lattice.

Original language	English
Article number	075110
Number of pages	16
Journal	Physical Review B
Volume	94
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.94.075110
Publication status	Published - 5 Aug 2016

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abstract = "Ultracold bosons in a triangular lattice are a promising candidate for observing quantum spin liquid behavior. Here we investigate, for such system, the role of a harmonic trap giving rise to an inhomogeneous density. We construct a modified spin-wave theory for arbitrary filling and predict the breakdown of order for certain values of the lattice anisotropy. These regimes, identified with the spin liquid phases, are found to be quite robust upon changes in the filling factor. This result is backed by an exact diagonalization study on a small lattice.",

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AU - Celi, Alessio

AU - Grass, Tobias

AU - Ferris, Andrew J.

AU - Padhi, Bikash

AU - Raventós, David

AU - Simonet, Juliette

AU - Sengstock, Klaus

AU - Lewenstein, Maciej

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Y1 - 2016/8/5

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AB - Ultracold bosons in a triangular lattice are a promising candidate for observing quantum spin liquid behavior. Here we investigate, for such system, the role of a harmonic trap giving rise to an inhomogeneous density. We construct a modified spin-wave theory for arbitrary filling and predict the breakdown of order for certain values of the lattice anisotropy. These regimes, identified with the spin liquid phases, are found to be quite robust upon changes in the filling factor. This result is backed by an exact diagonalization study on a small lattice.

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Modified spin-wave theory and spin-liquid behavior of cold bosons on an inhomogeneous triangular lattice

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