Efimov effect in quantum magnets

Physics is said to be universal when it emerges regardless of the underlying microscopic details. A prominent example is the Efimov effect, which predicts the emergence of an infinite tower of three-body bound states obeying discrete scale invariance when the particles interact resonantly. Because of its universality and peculiarity, the Efimov effect has been the subject of extensive research in chemical, atomic, nuclear and particle physics for decades. Here we employ an anisotropic Heisenberg model to show that collective excitations in quantum magnets (magnons) also exhibit the Efimov effect. We locate anisotropy-induced two-magnon resonances, compute binding energies of three magnons and find that they fit into the universal scaling law. We propose several approaches to experimentally realize the Efimov effect in quantum magnets, where the emergent Efimov states of magnons can be observed with commonly used spectroscopic measurements. Our study thus opens up new avenues for universal few-body physics in condensed matter systems.Comment: 7 pages, 5 figures; published versio

Implication of water activity on the bioactive compounds and physical properties of cocona (Solanum sessiliflorum Dunal) chips

The effect of water activity on the quality parameters of cocona chips obtained by a combined osmotic dehydration and hot air-drying method has been studied. Applying the combined treatment resulted in a product with 0.055± 0.005 g water/g product in 4.3 h of drying. Although this treatment caused a significant decrease (p<0.05) in the bioactive compounds analyzed, the antioxidant activity of the samples remained stable compared to fresh fruit. The applied treatment permitted the development of a sweet, crispy snack with acceptable optical and mechanical properties. To evaluate the stability of the cocona chips during storage, the water sorption behaviour (20 °C) and the relationship between the water content, water activity and the glass transition were also studied. Results showed that in order to ensure the functional quality preservation of cocona chips during long-term storage and avoid the crispness loss, the glassy state of the amorphous matrix must be guaranteed.The authors thank the Universidad Politecnica de Valencia for the financial support given throughout the Projects ADSIDEO-COOPERACION 2010 "Adaptacion de procesos de secado para favorecer la comercializacion de superfrutas de origen colombiano" and ADSIDEO-COOPERACION 2012 "Contribucion a la mejora del estado nutricional en poblaciones infantiles rurales del departamento del Choco a partir de materias primas de uso tradicional".Agudelo-Sterling, C.; Igual Ramo, M.; Moraga Ballesteros, G.; Martínez Navarrete, N. (2015). Implication of water activity on the bioactive compounds and physical properties of cocona (Solanum sessiliflorum Dunal) chips. Food and Bioprocess Technology. 9(1):167-171. doi:10.1007/s11947-015-1611-zS16717191Acevedo, N., Schebor, C., & Buera, M. P. (2006). 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