نتایج جستجو برای: quantum point contact
تعداد نتایج: 947201 فیلتر نتایج به سال:
A physical mechanism has been proposed to explain the appearance of multichannel electron transport regime in trench quantum point contacts. It shown that redistribution electrons a two-dimensional gas, which is due Coulomb interaction between them and with charged donors X-valley electrons, results experimentally observed regime. The numerical simulation its comparison measurements conductance...
Charge sensing with quantum point-contacts (QPCs) is a technique widely used in semiconductor quantum-dot research. Understanding the physics of this measurement process, as well as finding ways of suppressing unwanted measurement back-action, are therefore both desirable. In this article, we present experimental studies targeting these two goals. Firstly, we measure the effect of a QPC on elec...
A new technique is presented which enables the fabrication of highly transparent Josephson junctions in combination with mesoscopic devices. We utilize a modified AFM tip to plough grooves into superconducting material, thus defining a weak link. This weak link is made within the su-perconducting split-gates, which are used to electrostatically form a conventional quantum dot and serves as a so...
Division of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA Bell Labs, ...
We investigate the Josephson effect in the graphene nanoribbons of length L smaller than the superconducting coherence length and an arbitrary width W . We find that in contrast to an ordinary superconducting quantum point contact (SQPC) the critical supercurrent Ic is not quantized for the nanoribbons with smooth and armchair edges. For a low concentration of the carriers Ic decreases monotoni...
Abstract: In this study, the effects of variation of thickness and the number of quantumwells as well as the contact length were investigated. In this paper, a vertical cavity surfaceemitting laser was simulated using of software based on finite element method. Thenumber of quantum wells was changed from 3 to 9 and the results which are related tooutput power, resonance ...
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