The Experts below are selected from a list of 70104 Experts worldwide ranked by ideXlab platform
David Neilson - One of the best experts on this subject based on the ideXlab platform.
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Experimental conditions for the observation of electron hole superfluidity in gaas heterostructures
Physical Review B, 2020Co-Authors: S Saberipouya, Sara Conti, Andrea Perali, A F Croxall, A Hamilton, F M Peeters, David NeilsonAbstract:The Experimental Parameter ranges needed to generate superfluidity in optical and drag experiments in GaAs double quantum wells are determined using a formalism that includes self-consistent screening of the Coulomb pairing interaction in the presence of the superfluid. The very different electron and hole masses in GaAs make this a particularly interesting system for superfluidity with exotic superfluid phases predicted in the BCS-Bose-Einstein condensation crossover regime. We find that the density and temperature ranges for superfluidity cover the range for which optical experiments have observed indications of superfluidity but that existing drag experiments lie outside the superfluid range. We also show that, for samples with low mobility with no macroscopically connected superfluidity, if the superfluidity survives in randomly distributed localized pockets, standard quantum capacitance measurements could detect these pockets.
I Uchida - One of the best experts on this subject based on the ideXlab platform.
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Verification of a simple numerical fuel cell model in a flowsheeting program by performance testing of a 110 cm2 molten carbonate fuel cell
Energy Conversion and Management, 2003Co-Authors: S.f. Au, N. Woudstra, Kas Hemmes, I UchidaAbstract:This article presents a verification of a simple numerical model that uses the cell resistance as the only Experimental Parameter. Two methods for determining this Experimental Parameter are evaluated by comparing the actual measured cell voltages with the calculated cell voltages at various gas utilizations and current loads. Furthermore, the results of the model are compared with the analytical fuel cell model that was previously developed at Delft University. Both the simple numerical model and the analytical fuel cell model use isothermal electrochemical relations for determination of the performances. In order to assess this numerical model for application to non-isothermal molten carbonate fuel cell stacks found in practice, the discrepancy between the results from the isothermal model and the non-isothermal model is discussed. The maximum relative discrepancy between the measured and calculated cell voltage by the numerical model was 3%. This discrepancy was reduced to 1.7% when using a fitted value for the cell resistance. Comparison of the results of the isothermal and non-isothermal models shows that the differences in results can, in general, be neglected.
Xiang-bin Wang - One of the best experts on this subject based on the ideXlab platform.
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sending or not sending twin field quantum key distribution breaking the direct transmission key rate
Physical Review A, 2020Co-Authors: Cong Jiang, Xiang-bin WangAbstract:We present improved results of sending-or-not-sending twin-field quantum key distribution by using error rejection through two-way classical communications. Our error rejection method, especially our method of actively odd-parity pairing (AOPP) can drastically improve the performance of sending-or-not-sending twin-field protocol in both secure distance and key rate. Taking a typical Experimental Parameter setting, our method here improves the secure distance by 70 km to more than 100 km in comparison with the prior art results. Comparative study also shows advantageous in key rates at regime of long distance and large misalignment error rate for our method here. The numerical results show that our method here can significantly exceed the absolute limit of direct transmission key rate, and also have an advantageous key rates higher than various prior art results by 10 to 20 times.
Ning Wang - One of the best experts on this subject based on the ideXlab platform.
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formation of zno nanostructures by a simple way of thermal evaporation
Applied Physics Letters, 2002Co-Authors: B D Yao, Y F Chan, Ning WangAbstract:Mass production of ZnO nanowires, nanoribbons, and needle-like rods has been achieved by a simple method of thermal evaporation of ZnO powders mixed with graphite. Metallic catalysts, carrying gases, and vacuum conditions are not necessary. Temperature is the critical Experimental Parameter for the formation of different morphologies of ZnO nanostructures. Zn or Zn suboxide plays a crucial role for the nucleation of ZnO nanostructures. The as-prepared ZnO nanowires consist of single crystalline cores and thin amorphous shells. As determined by electron diffraction, the growth direction of ZnO nanowires is [001], which has no orientation relationship with the substrate. A strong room-temperature photoluminescence in ZnO nanostructures has been demonstrated.
Sara Conti - One of the best experts on this subject based on the ideXlab platform.
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Experimental conditions for the observation of electron hole superfluidity in gaas heterostructures
Physical Review B, 2020Co-Authors: S Saberipouya, Sara Conti, Andrea Perali, A F Croxall, A Hamilton, F M Peeters, David NeilsonAbstract:The Experimental Parameter ranges needed to generate superfluidity in optical and drag experiments in GaAs double quantum wells are determined using a formalism that includes self-consistent screening of the Coulomb pairing interaction in the presence of the superfluid. The very different electron and hole masses in GaAs make this a particularly interesting system for superfluidity with exotic superfluid phases predicted in the BCS-Bose-Einstein condensation crossover regime. We find that the density and temperature ranges for superfluidity cover the range for which optical experiments have observed indications of superfluidity but that existing drag experiments lie outside the superfluid range. We also show that, for samples with low mobility with no macroscopically connected superfluidity, if the superfluidity survives in randomly distributed localized pockets, standard quantum capacitance measurements could detect these pockets.
