Oriented polaritons in strongly-coupled asymmetric double quantum well microcavities

Replacing independent single quantum wells inside a strongly-coupled semiconductor microcavity with double quantum wells produces a special type of polariton. Using asymmetric double quantum wells in devices processed into mesas allows the alignment of the electron levels to be voltage-tuned. At the resonant electronic tunnelling condition, we demonstrate that `oriented polaritons' are formed, which possess greatly enhanced dipole moments. Since the polariton-polariton scattering rate depends on this dipole moment, such devices could reach polariton lasing, condensation and optical nonlinearities at much lower threshold powers.Comment: 3 figure

Non-resonant optical control of a spinor polariton condensate

We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical pump and the degree of circular polarisation (DCP) of the condensate at the onset of condensation. With increasing excitation density we observe a reversal of the DCP. The spin dynamics of the trapped condensate are described within the framework of the spinor complex Ginzburg-Landau equations in the Josephson regime, where the dynamics of the system are reduced to a current-driven Josephson junction. We show that the observed spin reversal is due to the interplay between an internal Josephson coupling effect and the detuning of the two projections of the spinor condensate via transition from a synchronised to a desynchronised regime. These results suggest that spinor polariton condensates can be controlled by tuning the non-resonant excitation density offering applications in electrically pumped polariton spin switches

Introduction: Understanding social media monopolies

The ubiquitous presence of social media in everyday life has not been met by equally pervasive research efforts for their critical understanding, due mostly to the increasing specialization and fragmentation of academic research. Unlike Us: Understanding Social Media Monopolies attempts to set out a research platform that overcomes both the dominant quantitative analyses and the privacy paradigm in current social media research

Introduction: Understanding social media monopolies

The ubiquitous presence of social media in everyday life has not been met by equally pervasive research efforts for their critical understanding, due mostly to the increasing specialization and fragmentation of academic research. Unlike Us: Understanding Social Media Monopolies attempts to set out a research platform that overcomes both the dominant quantitative analyses and the privacy paradigm in current social media research

Religion in InternationalRelationsThe Return From Exile

No description supplie

The containment of labour in accelerated global supply chains : the case of Piraeus Port

This article presents a case study of the sale of two of the three piers at the formerly state-owned container port of Piraeus, in Greece to a Chinese company, COSCO, formng a crucial hub in the transit of goods to European markets, and examines the impacts on labour. It places this study in the context of the global consolidation, restructuring and acceleration of supply chains as well as in the specific context of privatisation of infrastructure and deregulation of labour in Greece in the aftermath of the debt crisis. Anatomising the tangled dynamics of deterritorialisation and reterritorialisation, it illustrates the complexity of the interrelationships between specific local factors and global forces in reshaping work. It also shows how the fragmentation of labour resulting from these impacts makes it easy for global corporations in the logistics sector both to consolidate their power and to evade contemporary forms of labour mobilisation. After chronicling the forms of resistance adopted by workers at the port, the article concludes by reflecting on the implications for organisation along the increasingly tightly integrated supply chains which link the labour of production workers with that of logistics workers.Peer reviewe

Võrdseid võimalusi ja õppimist soodustav koolijuhtimine ning koolide autonoomia

Artikkel põhineb koolijuhtimise Euroopa võrgustiku (EPNoSL) raames tehtud tööl, eelkõige 21 Euroopa riigi koolijuhtimise strateegiate süvauuringul ja aruteludel, mis toimuvad EPNoSLi veebiseminaridel, riikide õpikodades ja vastastikuse õppe üritustel, millest võtavad osa mitmes ELi riigis koolijuhtimisega seotud huvirühmad (sh Euroopa, riikliku ja kohaliku tasandi poliitikakujundajad, koolijuhid, õpetajad ja teised haridustöötajad, õppejõud, lapsevanemad ja õpilased). EPNoSL on Euroopas tegutsevast 42 institutsioonist koosnev võrgustik, mille eesmärk on parandada Euroopa koolide juhtimist nii poliitilisel kui ka praktilisel tasandil. Artiklis käsitletakse koolide autonoomia küsimust Euroopa koolijuhtimise strateegiate kujundamise kontekstis. Koolide autonoomiat peetakse tervikliku koolijuhtimise poliitika väljatöötamise oluliseks eeltingimuseks. Artikkel tugineb kõnealuse projekti raames välja töötatud laiaulatuslikule koolijuhtimise strateegia kujundamise raamistikule ja sellel on kaks põhieesmärki. Esiteks püütakse artiklis näidata, et selle asemel et otsida koolide autonoomia puhul ühte, kõigile sobivat lahendust, tuleks keskenduda konkreetset olukorda arvestavale strateegiale, mille eesmärk on saavutada kindlaksmääratud õpitulemused ja võrdsed võimalused. Teiseks on artiklis kirjeldatud seitset koolide autonoomia põhisuunda, mida on võimalik kohandada Euroopa eripalgeliste haridussüsteemidega.  Full tex