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- W2964303483 abstract "The Casimir effect is a general phenomenon in physics, which arises when the vacuum fluctuation of an arbitrary field is modified by static or slowly varying boundary. However, its spin version is rarely addressed, mainly due to the fact that a macroscopic boundary in quantum spin systems is hard to define. In this article, we explore the spin Casimir effect induced by the zero-point fluctuation of spin waves in a general non-collinear ordered quantum antiferromagnet. This spin Casimir effect results in a spin torque between local spins and further causes various singular and divergent results in the framework of spin-wave theory, which invalidate the standard 1/S expansion procedure. Based on the spin Casimir torque interpretation, we develop a spin-wave expansion approach named as torque equilibrium spin wave theory (TESWT). In this approach, the spin Casimir effect is treated in a self-consistent way, and the spin-wave expansion results are free from singularities and divergences. A detailed spin-wave analysis of the antiferromagnetic spin-1/2 Heisenberg model on a spatially anisotropic triangular lattice is undertaken within our approach. Our results indicate that the spiral order is only stable in the region 0.5 < α < 1.2, where α is the ratio of the coupling constants. In addition, the instability in the region 1.2 < α < 2 is owing to the spin Casimir effect instead of the vanishing sublattice magnetization. Furthermore, our method provides an efficient and convenient tool that can estimate the correct exchange parameters and outline the quantum phase diagrams, which can be useful for experimental fitting processes in frustrated quantum magnets." @default.
- W2964303483 created "2019-07-30" @default.
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- W2964303483 date "2015-01-01" @default.
- W2964303483 modified "2023-09-27" @default.
- W2964303483 title "Spin Casimir Effect in Non-collinear Quantum Antiferromagnets: Torque Equilibrium Spin Wave Approach" @default.
- W2964303483 hasPublicationYear "2015" @default.
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