Double-Independent-Gate (DIG) Field Effect Transistors (FETs) are expected to extend Moore’s law in the coming years. Many emerging technologies present the possibility to have DIG FETs with one gate controlling online the device polarity. Such devices are called ambipolar transistors and efficiently embed the XOR function. Logic gates based on ambipolar transistors can implement more complex l...

The upper chromosphere and lower transition region of dMe stars. Abstract. Models for the upper chromosphere and the lower transition region of dM0e-dM2e stars are presented. The modelling procedure is based on a modiication of the semi-empirical approach useful for evaluating the eeects of prescribed transport processes to the energy balance. The statistical equilibrium equations include terms...

Despite the widespread use of solution-processable hybrid organic-inorganic perovskites in photovoltaic and light-emitting applications, determination of their intrinsic charge transport parameters has been elusive due to the variability of film preparation and history-dependent device performance. Here we show that screening effects associated to ionic transport can be effectively eliminated b...

Abstract Energetic electron populations can substantially modify the neoclassical transport properties in stellarators. A model accounting for this change in transport is developed assuming the presence of electron cyclotron resonance heating (ECRH). The quasilinear diffusion coefficient for second harmonic X-mode ECRH is developed for a bumpy stellarator. Care is taken in accounting for the pi...

We investigate the question of whether ambipolar diffusion (ion-neutral drift) determines the smallest length and mass scale on which structure forms in a turbulent molecular cloud. We simulate magnetized turbulence in a mostly neutral, uniformly driven, turbulent medium, using a three-dimensional, two-fluid, magnetohydrodynamics (MHD) code modified from Zeus-MP. We find that substantial struct...

A kinetic theory for the anomalous heating of ions from energy stored in magnetic turbulence is presented. Imposing self-consistency through the constitutive relations between particle distributions and fields, a turbulent Kirchhoff’s Law is derived that expresses a direct connection between rates of ion heating and electron thermal transport. This connection arises from the kinematics of elect...