QmeQ 1.0: An open-source Python package for calculations of transport through quantum dot devices

QmeQ is an open-source Python package for numerical modeling of transport through quantum dot devices with strong electron-electron interactions using various approximate master equation approaches. The package provides a framework for calculating stationary particle or energy currents driven by differences in chemical potentials or temperatures between the leads which are tunnel coupled to the quantum dots. The electronic structures of the quantum dots are described by their single-particle states and the Coulomb matrix elements between the states. When transport is treated perturbatively to lowest order in the tunneling couplings, the possible approaches are Pauli (classical), first-order Redfield, and first-order von Neumann master equations, and a particular form of the Lindblad equation. When all processes involving two-particle excitations in the leads are of interest, the second-order von Neumann approach can be applied. All these approaches are implemented in QmeQ. We here give an overview of the basic structure of the package, give examples of transport calculations, and outline the range of applicability of the different approximate approaches.Comment: 34 pages, 10 figure

Violent Borders: Refugees and the Right to Move, by Reece Jones

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The "imaginary world" of nationalistic ethics:Feasibility constraints on Nordic deportation corridors targeting unaccompanied Afghan minors

This article examines Swedish, Danish and Norwegian governments’ participation in the European Return Platform for Unaccompanied Minors (ERPUM) project and its failed attempts to deport unaccompanied minors (UAMs) to Afghanistan. It argues that ERPUM is an interesting and urgent case of a “deportation corridor”, and suggests that this framework can benefit from analysis through normative and applied ethics and in particular discussions of feasibility constraints. It therefore identifies and critically assesses two nationalistic arguments for deportation common in Nordic politics, based on appeals credibility and humanitarianism. Considering the growth of nationalistic immigration policies in Nordic states, the article turns the usual discussions of feasibility on its head by showing that not only cosmopolitan, but also nationalistic ethics must face up to charges of lacking realism. More specifically, it argues that the case of ERPUM illustrates how nationalistic deportation ethics can rely on inconsistent normative and erroneous empirical assumptions, which can be criticized for their arbitrariness, ideological grounding and lacking feasibility