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RISS 인기검색어
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- 저자 : Gohlke, Matthias (검색결과 2 건)
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Quantum spin liquid signatures in Kitaev-like frustrated magnets
Gohlke, Matthias,Wachtel, Gideon,Yamaji, Youhei,Pollmann, Frank,Kim, Yong Baek American Physical Society 2018 Physical review. B Vol.97 No.7
<P>Motivated by recent experiments on alpha-RuCl3, we investigate a possible quantum spin liquid ground state of the honeycomb-lattice spin model with bond-dependent interactions. We consider the K-Gamma model, where K and Gamma represent the Kitaev and symmetric-anisotropic interactions between spin-1/2 moments on the honeycomb lattice. Using the infinite density matrix renormalization group, we provide compelling evidence for the existence of quantum spin liquid phases in an extended region of the phase diagram. In particular, we use transfer-matrix spectra to show the evolution of two-particle excitations with well-defined two-dimensional dispersion, which is a strong signature of a quantum spin liquid. These results are compared with predictions from Majorana mean-field theory and used to infer the quasiparticle excitation spectra. Further, we compute the dynamical structure factor using finite-size cluster computations and show that the results resemble the scattering continuum seen in neutron-scattering experiments on alpha-RuCl3. We discuss these results in light of recent and future experiments.</P>
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Rafael F.N. Quadrado,Gustavo Gohlke,Robson S. Oliboni,Alessandra Smaniotto,André R. Fajardo 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Silver nanoparticles (AgNPs) were synthesized using an innovative strategy that makes use of tangerinepeels extract, which acts as a reducing and stabilizing agent. This eco-friendly synthetic route allowedobtaining spherical nanoparticles with narrow size distribution (19.2 6.7 nm) within a short reaction time(40 min). Later, the AgNPs suspension was entrapped in a poly(vinyl alcohol) (PVA) matrix forming a hybridhydrogel (PVA-gel/AgNPs), which was characterized by different techniques. Its catalytic activity wasexplored in the reduction of nitrobenzene to aniline in aqueous media. The reaction catalyzed by PVA-gel/AgNPs exhibited kinetics (kapp2.07 10 3 min 1) and energy of activation (Ea50.36 kJ mol 1)comparable to or lower than similar reactions catalyzed by other metals. Moreover, a better catalyticperformance was noticed to the hybrid hydrogel as compared to “free” AgNPs, highlighting theirentrapment within the hydrogel. The anchoring of the AgNPs in the hydrogel network, prevents theiraggregation and leaching. The hybrid hydrogel is recovered quickly from the reaction medium, and it can besuccessfully reused for six consecutive runs without significant loss of its activity. Overall, it is presentedhere a cheap, efficient, and eco-friendly methodology to synthesize AgNPs and newly hybrid hydrogels,which have the potential to catalyze the reduction of nitroaromatic compounds.
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