Observation of hexagonal nuclei in the once melt-quenched Ge2Sb2Te5 phase change contact dimensions
The microstructures of once melt-quenched Ge2Sb2Te5 (GST) phase change contact dimensions are directly investigated with high resolution transmission electron microscopy (HR-TEM) by applying reset pul...
The microstructures of once melt-quenched Ge2Sb2Te5 (GST) phase change contact dimensions are directly investigated with high resolution transmission electron microscopy (HR-TEM) by applying reset pul...
Evidence for attainability of negative differential conductance in tunnel Schottky structures with two-dimensional channels
Experimental data, which demonstrate conductance decrease in the tunnel Al/GaAs Schottky structure with delta-n-doped two-dimensional channel, are presented. The conductance decreases due to the incre...
Experimental data, which demonstrate conductance decrease in the tunnel Al/GaAs Schottky structure with delta-n-doped two-dimensional channel, are presented. The conductance decreases due to the incre...
Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator
Appl. Phys. Lett. 91, 083509 (2007); doi:10.1063/1.2773988
Published 22 August 2007
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The authors create a Josephson parametric amplifier from a transmission line resonator whose inner conductor is made from a series of superconducting quantum interference device (SQUID) array. By changing the magnetic flux through the SQUID loops, they are able to adjust the circuit's resonance frequency and the center of the amplified band between 4 and 7.8 GHz. They observe that the amplifier has gains as large as 28 dB and infers that it adds less than twice the input vacuum noise.
©2007 American Institute of Physics
| History: | Received 6 June 2007; accepted 31 July 2007; published 22 August 2007 |
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