Coulomb Drag between One-Dimensional Wigner Crystal Rings

We consider the Coulomb drag between two metal rings in which the long range Coulomb interaction leads to the formation of a Wigner crystal. The first ring is threaded by an Ahranov Bohm flux creating a persistent current J_0. The second ring is brought in close proximity to the second and due to the Coulomb interaction between the two rings a drag current J_D is produced in the second. We investigate this system at zero temperature for perfect rings as well as the effects of impurities. We show that the Wigner crystal state can in principle lead to a higher ratio of drag current to drive current J_D/J_0 than in weakly interacting electron systems.Comment: 12 pages, 10 figure

The Parallelometer: a mechanical device to study curvature

A simple mechanical device is introduced, the parallelometer, that can be used to measure curvatures of surfaces. The device can be used as a practical illustration of parallel transport of a vector and to study Berry phase shift when it is carried along a loop on the surface. Its connection to the Foucault pendulum is discussed. The experimental results can be successfully compared with the theoretical expectations. The experiment is inexpensive and conceptually easy to perform and understand for a beginner

A Latin American perspective on diversity management: what does "inclusion" mean in a Peruvian context?

Although interest in inclusion is becoming widespread, there remains limited understanding of how organizations can create environments that promote inclusiveness and unlock the benefits of workforce diversity. Additional research is needed to better understand how inclusion is conceptualized and experienced in contexts other than North America and Europe. Taking an exploratory approach, the present research seeks to answer the question of how employees in Peru – one of the most socially and economically unequal nations in Latin America - understand the concept of inclusion in the workplace. Semi-structured interviews with thirty employed individuals found that inclusion was generally described as comprising belongingness, uniqueness, and equal treatment. Six elements emerged as key to the creation of workplace inclusion: participation, positive relationships, equality, feeling valued, climate and culture, and positive work conditions. As inhabitants of a developing country with high levels of inequality and discrimination, Peruvian employees’ views provide valuable insight into how inclusion is lived and understood in such a context, and how it may be augmented

Microscopic origin of granular ratcheting

Numerical simulations of assemblies of grains under cyclic loading exhibit ``granular ratcheting'': a small net deformation occurs with each cycle, leading to a linear accumulation of deformation with cycle number. We show that this is due to a curious property of the most frequently used models of the particle-particle interaction: namely, that the potential energy stored in contacts is path-dependent. There exist closed paths that change the stored energy, even if the particles remain in contact and do not slide. An alternative method for calculating the tangential force removes granular ratcheting.Comment: 13 pages, 18 figure