Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

We have shown theoretically that efficient multiple exciton generation (MEG) by a single photon can be observed in small nanocrystals (NCs). Our quantum simulations that include hundreds of thousands of exciton and multi-exciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond timescale. Including phonon relaxation confirms that efficient MEG requires the exciton--biexciton coupling time to be faster than exciton relaxation time

Pion interferometry in Au+Au collisions at sqrt[sNN]=200GeV

We present a systematic analysis of two-pion interferometry in Au+Au collisions at sqrt[sNN]=200GeV using the STAR detector at Relativistic Heavy Ion Collider. We extract the Hanbury-Brown and Twiss radii and study their multiplicity, transverse momentum, and azimuthal angle dependence. The Gaussianness of the correlation function is studied. Estimates of the geometrical and dynamical structure of the freeze-out source are extracted by fits with blast-wave parametrizations. The expansion of the source and its relation with the initial energy density distribution is studied

Illusions of Utopia: When Prison Architects (Reluctantly) Play Tetris

Although prisons are increasingly built away from cities, prison architects are imagining prisons as cities. Such an urban metaphor is perhaps unsurprising; both the prison and the city are often assumed to be relatively bounded places, prisons arguably resembling self-sufficient cities with facilities such as accommodation, classrooms, workshops, laundries, health clinics and gardens contained within their walls. The vocabulary of the city is also pervasive when justifying prison architecture. In this chapter we consider why prison architects use the metaphor of the city to describe the prisons they design, using terminology such as ‘walled bungalows’, ‘penitentiary houses’, ‘vertical prisons’ and ‘cell apartments’, and we examine the significance of this rather dystopian urban imaginary in allowing architects to retain some agency within a design process which minimises their creative and political input