How do phonons relax molecular spins?

Spins and Phonons in Graphene Nanostructures

Quantum information science relies on quantum systems with sufficiently long coherence times. A spintronics implementation in graphene would benefit from the low density of nuclear spins in carbon and small spin-orbit interactions. The coupling of the spin to lattice dynamics puts an upper bound on spin coherence times. In addition, phonons in graphene are interesting due to the monatomic thick...

Do spins have directions?

The standard Bloch sphere representation has been recently generalized to describe not only systems of arbitrary dimension, but also their measurements, in what has been called the extended Bloch representation of quantum mechanics. This model, which offers a solution to the longstanding measurement problem, is based on the hidden-measurement interpretation of quantum mechanics, according to wh...

How to Relax a Bisimulation?

Merge-and-shrink abstraction (M&S) is an approach for constructing admissible heuristic functions for cost-optimal planning. It enables the targeted design of abstractions, by allowing to choose individual pairs of (abstract) states to aggregate into one. A key question is how to actually make these choices, so as to obtain an informed heuristic at reasonable computational cost. Recent work has...

Coupling Between Spins and Phonons Towards Ferroelectricity in Magnetoelectric Systems

Molecular signaling how do axons die?

Axons depend critically on axonal transport both for supplying materials and for communicating with cell bodies. This chapter looks at each activity, asking what aspects are essential for axon survival. Axonal transport declines in neurodegenerative disorders, such as Alzheimer's disease, amyotrophic lateral sclerosis, and multiple sclerosis, and in normal ageing, but whether all cargoes are eq...