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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>
Saul Matos de Castro,Rui Moreira,Ana Cristina Braga,Afonso Pinhao Ferreira,Maria Cristina Pollmann 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.4
Objective: To quantify, for each activation, the effect of preactivations of differing distribution and intensity on the neutral position of T-loops (7-mm height), specifically the horizontal force, moment to force (M/F) ratio, and load to deflection ratio. Methods: A total 100 loops measuring 0.017 × 0.025 inches in cross-section were divided into two groups (n = 50 each) according to composition, either stainless steel or beta-titanium. The two groups were further divided into five subgroups, 10 loops each, corresponding to the five preactivations tested: preactivations with occlusal distribution (0°, 20°, and 40°), gingival distribution (20°), and occlusal-gingival distribution (40°). The loops were subjected to a total activation of 6-mm with 0.5-mm iterations. Statistical analysis was performed using comprised ANOVA and Bonferoni multiple comparison tests, with a significance level of 5%. Results: The location and intensity of preactivation influenced the force intensity. For the M/F ratio, the highest value achieved without preactivation was lower than the height of the loop. Without preactivation, the M/F ratio increased with activation, while the opposite effect was observed with preactivation. The increase in the M/F ratio was greater when the preactivation distribution was partially or fully gingival. Conclusions: Depending on the preactivation distribution, displacement of uprights is higher or lower than the activation, which is a factor to consider in clinical practice.
Identification of an ABCB/P-glycoprotein-specific Inhibitor of Auxin Transport by Chemical Genomics
Kim, J.-Y.,Henrichs, S.,Bailly, A.,Vincenzetti, V.,Sovero, V.,Mancuso, S.,Pollmann, S.,Kim, D.,Geisler, M.,Nam, H.-G. The American Society for Biochemistry and Molecula 2010 The Journal of biological chemistry Vol.285 No.30