We study the quantum dynamics of Majorana and regular fermion bound states coupled to a quasi-one-dimensional metallic lead. The dynamics following the quench in the coupling to the lead exhibits a series of dynamical revivals as the bound state propagates in the lead and reflects from the boundaries. We show that the nature of revivals for a single Majorana bound state depends uniquely on the presence of a resonant level in the lead. When two spatially separated Majorana modes are coupled to the lead, the revivals depend only on the phase difference between their host superconductors. Remarkably, the quench in this case effectively performs a fermion-parity interferometry between Majorana bound states, revealing their unique non-Abelian braiding. Using both analytical and numerical techniques, we find the pattern of fermion parity transfers following the quench, study its evolution in the presence of disorder and interactions, and thus, ascertain the fate of Majorana in a rough Fermi sea.
The objective was to evaluate the prevalence of osteoporosis among Ethiopian immigrant and Israeli-born women and to determine the risk factors. The study revealed extreme prevalence of osteoporosis among Ethiopian immigrants (38.7). A strong association between calcium intake during adolescence, BMI, lactation duration, physical activity, oral contraceptive and osteoporosis is suggested. Introduction Osteoporosis is a chronic disease characterized by low bone mass and deterioration in the micro-architecture of bone that increases its susceptibility to fractures. We set out to evaluate the prevalence of osteoporosis among Ethiopian immigrant and Israeli-born women and to determine the risk factors.Methods A cross-sectional study among 181 Ethiopians immigrants and 98 Israeli-born women. Hip, forearm and spinal bone mineral density (BMD) were measured. Risk factor information was obtained from an interview. BMD and osteoporosis rates were compared between the groups.Stepwise regression models were constructed for osteoporosis as the dependent variable controlling for potential confounders. Results We defined 38.7% Ethiopian and 5.2% Israeli-born women as having osteoporosis. Rates of low BMI, prolonged lactation, age at first giving birth and sunlight exposure were higher in Ethiopian women compared to the Israeli-born. Multivariate analysis revealed a strong association between calcium intake during adolescence, BMI, lactation duration, physical activity, oral contraceptive use and osteoporosis. Conclusions The prevalence of osteoporosis among Ethiopian immigrant women living in Israel is extremely high compared to national and international rates. Therefore, we suggest that an immediate prevention program among Ethiopian women be started and guidelines for care-givers be developed, in order to raise their awareness for osteoporosis.
We study the dissipative Bose-Hubbard model on a small ring of sites in the presence of a chiral drive and explore its long-time dynamical structure using the mean-field equations and by simulating the quantum master equation. Remarkably, for large enough drivings, we find that the system admits, in a wide range of parameters, a chaotic attractor at the mean-field level, which manifests as a complex Wigner function on the quantum level. The latter is shown to have the largest weight around the approximate region of phase space occupied by the chaotic attractor. We demonstrate that this behavior could be revealed via measurement of various bosonic correlation functions. In particular, we employ open system methods to calculate the out-of-time-ordered correlator, whose exponential growth signifies a positive quantum Lyapunov exponent in our system. This can open a pathway to the study of chaotic dynamics in interacting systems of photons.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.