Defect Proliferation at the Quasicondensate Crossover of Two-Dimensional Dipolar Excitons Trapped in Coupled GaAs Quantum Wells.

We study ultracold dipolar excitons confined in a 10  μm trap of a double GaAs quantum well. Based on the local density approximation, we unveil for the first time the equation of state of excitons. Specifically, in this regime and below a critical temperature of about 1 K, we show that for a local density n∼(2-3)×10^{10}  cm^{-2} a coherent quasicondensate phase forms in the inner region of the trap, encircled by a more dilute and normal component in the outer rim.

Publisher's Note: Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons [Phys. Rev. Lett. 118, 127402 (2017)].

This corrects the article DOI: 10.1103/PhysRevLett.118.

Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons.

We study spatially indirect excitons of GaAs quantum wells, confined in a 10  μm electrostatic trap. Below a critical temperature of about 1 K, we detect macroscopic spatial coherence and quantized vortices in the weak photoluminescence emitted from the trap. These quantum signatures are restricted to a narrow range of density, in a dilute regime.

A randomized controlled trial of exposure therapy and cognitive restructuring for posttraumatic stress disorder.

Previous studies have reported that adding cognitive restructuring (CR) to exposure therapy does not enhance treatment gains in posttraumatic stress disorder (PTSD). This study investigated the extent to which CR would augment treatment response when provided with exposure therapy. The authors randomly allocated 118 civilian trauma survivors with PTSD to receive 8 individually administered sessions of either (a) imaginal exposure (IE), (b) in vivo exposure (IVE), (c) IE combined with IVE (IE/IVE), or (d) IE/IVE combined with CR (IE/IVE/CR).

Imaginal exposure alone and imaginal exposure with cognitive restructuring in treatment of posttraumatic stress disorder.

This study investigated the extent to which providing cognitive restructuring (CR) with prolonged imaginal exposure (IE) would lead to greater symptom reduction than providing IE alone for participants with posttraumatic stress disorder (PTSD). Fifty-eight civilian survivors of trauma with PTSD were randomly allocated to IE/CR, IE, or supportive counseling (SC). Treatment involved 8 individual weekly sessions with considerable homework.