An adaptive algorithm for n-body field expansions
Weinberg, Martin D.
1998-05-28
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Pinning of magnetic-field induced Wigner molecules (WMs) confined in
parabolic two-dimensional quantum dots by a charged defect is studied by an
exact diagonalization approach. We found a re-entrant pinning of the WMs as
function of the magnetic field, a magnetic field induced re-orientation of the
WMs and a qualitatively different pinning behaviour in the presence of a
positive and negative Coulomb impurity.
Comment: Accepted for publication on Physical Review B Rapid Communications
Comment: 15 pages, 8 figures
Comment: 14 pages, 5 figures
Experimental results on the absolute magneto-transmission of a series of high
density, high mobility GaAs quantum wells are compared with the predictions of
a recent magnetoplasmon theory for values of the filling factor above 2. We
show that the magnetoplasmon picture can explain the non-linear features
observed in the magnetic field evolution of the cyclotron resonance energies
and of the absorption oscillator strength. This provides experimental evidence
that inter Landau level excitations probed by infrared spectroscopy need to be
considered as many body excitations in terms of magnetoplasmons: this is
especially true when interpreting the oscillator strengths of the cyclotron
transitions.
Comment: Manuscript (5 pages, 3 figures) and supplementary material (8 pages,
9 figures); v2 includes additional supplementary material and references; to
be published in Phys. Rev. Lett
We present theoretical studies of the influence of spin orbit coupling on the
spin wave excitations of the Fe monolayer and bilayer on the W(110) surface.
The Dzyaloshinskii-Moriya interaction is active in such films, by virtue of the
absence of reflection symmetry in the plane of the film. When the magnetization
is in plane, this leads to a linear term in the spin wave dispersion relation
for propagation across the magnetization. The dispersion relation thus assumes
a form similar to that of an energy band of an electron trapped on a
semiconductor surfaces with Rashba coupling active. We also show SPEELS
response functions that illustrate the role of spin orbit coupling in such
measurements. In addition to the modifications of the dispersion relations for
spin waves, the presence of spin orbit coupling in the W substrate leads to a
...
Comment: 9 pages, 2 figures
Comment: 27 pages, 13 figures, submitted to IEEE Trans. Electron. Dev.,
corrected typos, conclusions clarified, less meaningful figures suppressed
The current noise spectrum of a single-electron transistor (SET) coupled to a
nano-mechanical resonator is calculated in the classical regime. Correlations
between the charge on the SET island and the position of the resonator give
rise to a distinctive noise spectrum which can be very different from that of
the uncoupled SET. The current noise spectrum of the coupled system contains
peaks at both the frequency of the resonator and double the resonator
frequency, as well as a strong enhancement of the zero-frequency noise. The
heights of the peaks are controlled by the strength of the coupling between the
SET and the resonator, the damping of the resonator, and the temperature of the
system.
