Dynamic effects induced by renormalization in anisotropic pattern forming systems

The dynamics of patterns in large two-dimensional domains remains a challenge in non-equilibrium phenomena. Often it is addressed through mild extensions of one-dimensional equations. We show that full 2D generalizations of the latter can lead to unexpected dynamical behavior. As an example we consider the anisotropic Kuramoto-Sivashinsky equation, that is a generic model of anisotropic pattern forming systems and has been derived in different instances of thin film dynamics. A rotation of a ripple pattern by $90^{\circ}$ occurs in the system evolution when nonlinearities are strongly suppressed along one direction. This effect originates in non-linear parameter renormalization at different rates in the two system dimensions, showing a dynamical interplay between scale invariance and wavelength selection. Potential experimental realizations of this phenomenon are identified.Comment: 5 pages, 3 figures; supplemental material available at journal web page and/or on reques

Matrix Product State applications for the ALPS project

The density-matrix renormalization group method has become a standard computational approach to the low-energy physics as well as dynamics of low-dimensional quantum systems. In this paper, we present a new set of applications, available as part of the ALPS package, that provide an efficient and flexible implementation of these methods based on a matrix-product state (MPS) representation. Our applications implement, within the same framework, algorithms to variationally find the ground state and low-lying excited states as well as simulate the time evolution of arbitrary one-dimensional and two-dimensional models. Implementing the conservation of quantum numbers for generic Abelian symmetries, we achieve performance competitive with the best codes in the community. Example results are provided for (i) a model of itinerant fermions in one dimension and (ii) a model of quantum magnetism.Comment: 11+5 pages, 8 figures, 2 example

Probing the longitudinal momentum spread of the electron wave packet at the tunnel exit

We present an ellipticity resolved study of momentum distributions arising from strong-field ionization of Helium at constant intensity. The influence of the ion potential on the departing electron is considered within a semi-classical model consisting of an initial tunneling step and subsequent classical propagation. We find that the momentum distribution can be explained by the presence of a longitudinal momentum spread of the electron at the exit from the tunnel. Our combined experimental and theoretical study provides an estimate of this momentum spread

Microstructures of Hibonite From an ALH A77307 (CO3.0) CAI: Evidence for Evaporative Loss of Calcium

Hibonite is a comparatively rare, primary phase found in some CAIs from different chondrite groups and is also common in Wark-Lovering rims [1]. Hibonite is predicted to be one of the earliest refractory phases to form by equilibrium condensation from a cooling gas of solar composition [2] and, therefore, can be a potential recorder of very early solar system processes. In this study, we describe the microstructures of hibonite from one CAI in ALH A77307 (CO3.0) using FIB/TEM techniques in order to reconstruct its formational history

Evaluation of a totally smoke-free forensic psychiatry inpatient facility: practice and policy implications

Author version made available in accordance with the publisher's policyObjective: To evaluate the impact of implementing smoke-free policy in an Australian high security forensic psychiatry inpatient hospital. Methods: Focus groups (N=21) and surveys with patients (N=45) and surveys with staff (N=111, 53.2% nurses) elicited their experience and attitudes towards smoke-free policy. A follow-up survey elicited the impact of the policy on 15 patients’ smoking practice post discharge. Results: Eighty-five percent of patients stated it was easier quitting when no-one else smoked. Over half of discharged patients surveyed (58%) continued to not smoke post-discharge, despite almost half of staff (41%) perceiving that patients were unlikely to quit long-term. Smoking staff were significantly more pessimistic than non-smoking staff. Many patients (69%) perceived that their health had improved as a result of not smoking. Most staff (80%) viewed nicotine dependence treatment as important, but fewer (66%) felt confident to support patients to stop smoking. Increased patient violence and management difficulties expected by staff were not realized. Conclusions: Smoke-free policy can be successfully implemented in forensic psychiatry inpatient units. Nursing staff are a large and important group who need particular support to implement smoke-free policy into practice effectively, particularly those who are smokers. Continuity of care as part of a coordinated policy and service response is needed

Superstructure-Dependent Loading of DNA Origami Nanostructures with a Groove-Binding Drug

Peer reviewe