Bound-states and polarized charged zero modes in three-dimensional topological insulators induced by a magnetic vortex

By coating a three-dimensional topological insulator (TI) with a ferromagnetic film supporting an in-plane magnetic vortex, one breaks the time-reversal symmetry (TRS) without generating a mass gap. It rather yields electronic states bound to the vortex center which have different probabilities associated with each spin mode. In addition, its associate current (around the vortex center) is partially polarized with an energy gap separating the most excited bound state from the scattered ones. Charged zero-modes also appear as fully polarized modes localized near the vortex center. From the magnetic point of view, the observation of such a special current in a TI-magnet sandwich comes about as an alternative technique for detecting magnetic vortices in magnetic thin films.Comment: 8 pages, 3 figures, new version with more discussions and results accepted for publication in The European Physical Journal

Imagining world citizenship in the networked newspaper: La Nación reports the assassination at Sarajevo, 1914

'This paper analyzes La Nación's reporting of the assassination of Archduke Franz-Ferdinand in the week following the event. Analysis identifies the narrative components to these assassination stories, including geographical imaginaries and the places and networks of news production. Particular attention is paid to the mediatized ritual of mourning and succession that takes place in the capital cities with which La Nación's Buenos Aires readers are networked. Analysis is facilitated by some comparison with the coverage of the same event in The Los Angeles Times and The New Zealand Herald (Auckland). La Nación shared copy and sources with these and other newspapers, and printed similar stories about the assassination, but it cultivated its own local readership and its own ideas of citizenship in the wider world. Each editor imprinted his readers as moral citizens of the world, authorizing them to participate in the events as mourners, activists and compassionate observers, but also preconditioning the ways they can imagine assassination and the interactions of the diplomatic world. Analysis reveals expected roles in international affairs for citizens of world cities, which are conveyed as moral lessons and tales, wrapped in imagined communities stretching across the globe, but actualized locally.' (author's abstract

Remarks on Charged Vortices in the Maxwell-Chern-Simons Model

We study vortex-like configuration in Maxwell-Chern-Simons Electrodynamics. Attention is paid to the similarity it shares with the Nielsen-Olesen solutions at large distances. A magnetic symmetry between a point-like and an azimuthal-like current in this framework is also pointed out. Furthermore, we address the issue of a neutral and spinless particle interacting with a charged vortex, and obtain that the Aharonov-Casher-type phase depends upon mass and distance parameters.Comment: New refs. added. Version accepted for publication in Phys. Lett.

Further assembly work: A mountains to seas Blue Economy imaginary

In response to the suggestions of our commentators, we sketch in some new directions for geographic assembly work aimed at developing situated holistic Blue Economy imaginaries. We focus on several interlinked provocations: conceptualizing mountains to seas imaginaries, centring water, rethought relations of governmentality and governance derived from new ethically informed behaviours, strategies for transitioning conceptions into new policy models and attentiveness to global economic and environmental futures

Assembling a Blue Economy moment? Geographic engagement with globalizing biological-economic relations in multi-use marine environments

In the 2010s, the Blue Economy' has been widely advocated by a spectrum of interests as a strategy to save the world's oceans and water. This article explores what the Blue Economy moment is and how geographers can engage with it. It acknowledges recent efforts by geographers to understand Blue Economy but goes further by outlining the European Union's Blue Economy programmes and by discussing these in relation to recent agenda setting in marine science. We argue that in spite of apparent convergence on this goal, the Blue Economy imaginary disciplines disparate knowledge for economic projects, when the planetary reality is that every economic project is axiomatically a biological project, with some economic aspects. In this context, the article outlines how assemblage thinking could be relevant to a human geography engagement with Blue Economy and what this could like, and how a relational conception of Blue Economy helps advance understanding. Finally, we discuss the difficulties and potential for human geographers to be genuinely enactive given the disciplinary framings that have already been assumed or imposed through Blue Economy. This last is highlighted by discussing engagement in a particular New Zealand Blue Economy initiative. Rather than either promoting or critiquing Blue Economy, we encourage informed and critical engagement with Blue Economy by geographers