5,509 research outputs found

    Reply to Comments of Steuernagel on the Afshar's Experiment

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    We respond to criticism of our paper "Paradox in Wave-Paricle Duality for Non-Perturbative Measurements". We disagree with Steuernagel's derivation of the visibility of the Afshar experiment. To calculate the fringe visibility, Steuernagel utilizes two different experimental situations, i.e. the wire grid in the pattern minima and in the pattern maxima. In our assessment, this proceduere cannot lead to the correct result for the complementarity properties of wave-particle in one particular experimental set-up

    Self-compensation in phosphorus-doped CdTe

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    We investigate the self-compensation mechanism in phosphorus-doped CdTe. The formation energies, charge transition levels, and defects states of several P-related point defects susceptible to cause self-compensation are addressed by first-principles calculations. Moreover, we assess the in uence of the spin-orbit coupling and supercell-size effects on the stability of AX centers donors, which are believed to be responsible for most of the self-compensation. We report an improved result for the lowest-energy configuration of the P interstitial (Pi_\text{i}) and find that the self-compensation mechanism is not due to the formation of AX centers. Under Te-rich growth conditions, (Pi_\text{i}) exhibits a formation energy lower than the substitutional acceptor (PTe_\text{Te}) when the Fermi level is near the valence band, acting as compensating donor. While, for Cd-rich growth conditions, our results suggest that p-type doping is limited by the formation of (PTe_\text{Te}-VTe_\text{Te}) complexes.Comment: 5 page

    Particle Mediated Quantum Effects

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    We analyze an experiment that consists of two statistically independent laser beams that cross, separate and end at detectors. At the beam intersection there is a thin wire at the center of a presumed dark interference fringe. Since photon count at end detectors is similar with or without the wire in place, wave visibility is maximum V=1. With the wire at the center of a dark fringe, classical wire diffraction is insignificant; thus, photons maintain their direction, which implies that there is a high level of particle which-way information, K=1. Since K^2+V^2=2, it appears that the complementarity inequality, K^2+V^2 smaller or equal 1, is violated. We find that there is no violation provided that virtual particles are included in the analysis of the complementarity inequality. We propose that virtual particles are a key component of the mechanism that explains how quantum effects work.Comment: References have been update
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