1,386 research outputs found
Transport in a Modulated One-Dimensional Ballistic Channel
No full textIn this paper we review measurements on a modulated one-dimensional (1D) ballistic
channel. We have designed a novel 1D channel with three separate and independently contacted
overlaying finger gates. By changing the applied voltages on the overlaying gate fingers,
we are able to vary the potential modulation in a ballistic 1D channel. Our experimental results
fall into two categories. (i) We show that “the 0.7 structure” [K. J. Thomas et al., Phys.
Rev. Lett. 77, 135 (1996)] persists despite a change of the lateral confinement strength by a
factor of 2. We have also shown that the 0.7 structure present in two 1D channels in series
behaves like a single 1D channel, demonstrating that the 0.7 structure is not a transmission
effect through a ballistic channel at zero in-plane magnetic field. (ii) In our versatile system,
an open quantum dot can be electrostatically defined by a split-gate, and two overlaying finger
gates which introduce entrance and exit barriers to the dot. In this case, we observe continuous
and periodic oscillations superimposed upon ballistic conductance steps at zero magnetic
field. We ascribe the observed conductance oscillations, when the conductance through the
dot G exceeds 2e2=h, to experimental evidence for Coulomb charging effects in an open dot
[C.-T. Liang et al., Phys. Rev. Lett. 81, 3507 (1998)]. This is supported by the evolution
of the oscillatory features for G > 2e2=h as a function of both temperature and barrier transparency.
Moreover, we present clear experimental evidence that coherent resonant transport
and Coulomb charging effects co-exist in our system
A non-biotin polymerized horseradish-peroxidase method for the immunohistochemical diagnosis of canine distemper
No full textEffect of the electromagnetic environment on the dynamics of charge and phase particles in one-dimensional arrays of small Josephson junctions
No full textCoherent and incoherent specular inverse Faraday-effect in Yb<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>-δ
No full textObservation of coherent and incoherent terms of the Specular Inverse Faraday Effect (SIFE) in YBa2Cu3O7-δ is reported. The spectroscopic potential of measurements of the coherent and incoherent terms of SIFE is revealed and two components of nonresonant cubic susceptibility tensor in this superconducting material are measured and found to be in 10-9 to 10-8 esu range
Application of SAR Interferometry to a large thrusting deformation: the 1999 Mw 7.6 ChiChi earthquake (central Taiwan)
No full textC.T. Vivian, Joseph E. Lowery, and Tom Brown, circa 1980
No full textSouthern Christian Leadership Conference President Joseph E. Lowery is shown standing outside with C.T. Vivian (left) and Tom Brown (right) at Paschal's Motor Hotel.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the Joseph & Evelyn Lowery Institute for Justice and Human Rights, the Joseph Echols Lowery Irrevocable Trust, and other donors in supporting the processing and digitization of Morehouse College's Joseph Echols and Evelyn Gibson Lowery Collection
Transport and quantum lifetime dependence on electron density in gated GaAs/AlGaAs heterostructures
No full textWe present a study of the transport & quantum lifetime dependence on electron density in two completely di3erent kinds of two-dimensional electron gas systems. We observed that both the two scattering time increase with increasing the electron density. But the ratios of the transport to the quantum lifetime have di3erent tendency with the electron density, which do not conform to the conventional theory. We speculate that the screening e3ects need to be considered in order to explain our experimental resultsWe present a study of the transport and quantum lifetime dependence on electron density in two completely di3erent kinds
of two-dimensional electron gas systems. We observed that both the two scattering time increase with increasing the electron
density. But the ratios of the transport to the quantum lifetime have di3erent tendency with the electron density, which do
not conform to the conventional theory. We speculate that the screening e3ects need to be considered in order to explain our
experimental results
Controlling Steps During Early Stages of the Aligned Growth of Carbon Nanotubes Using Microwave Plasma Enhanced Chemical Vapor Deposition
No full textStudies of the Temperature-Driven Flow Lines and Phase Transitions in a Two-Dimensional Si/SiGe Hole System
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