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Comment on "Mass and K Lambda coupling of N*(1535)"
It is argued in [1] that when the strong coupling to the K Lambda channel is
considered, Breit-Wigner mass of the lightest orbital excitation of the nucleon
N(1535) shifts to a lower value. The new value turned out to be smaller than
the mass of the lightest radial excitation N(1440), which effectively solved
the long-standing problem of conventional constituent quark models. In this
Comment we show that it is not the Breit-Wigner mass of N(1535) that is
decreased, but its bare mass.
[1] B. C. Liu and B. S. Zou, Phys. Rev. Lett. 96, 042002 (2006).Comment: 3 pages, comment on "Mass and K Lambda coupling of N*(1535)", B. C.
Liu and B. S. Zou, Phys. Rev. Lett. 96, 042002 (2006
Holonomic Quantum Computing Based on the Stark Effect
We propose a spin manipulation technique based entirely on electric fields
applied to acceptor states in -type semiconductors with spin-orbit coupling.
While interesting in its own right, the technique can also be used to implement
fault-resilient holonomic quantum computing. We explicitly compute adiabatic
transformation matrix (holonomy) of the degenerate states and comment on the
feasibility of the scheme as an experimental technique.Comment: 5 page
Doublet bands in Cs in the triaxial rotor model coupled with two quasiparticles
The positive parity doublet bands based on the configuration in Cs have been investigated in the two
quasi-particles coupled with a triaxial rotor model. The energy spectra ,
energy staggering parameter , and
values, intraband ratios,
ratios, and orientation of the
angular momentum for the rotor as well as the valence proton and neutron are
calculated. After including the pairing correlation, good agreement has been
obtained between the calculated results and the data available, which supports
the interpretation of this positive parity doublet bands as chiral bands.Comment: Phys.Rev.C (accepted
Evidence for a new resonance with in the old data of reaction
Distinctive patterns are predicted by quenched quark models and unquenched
quark models for the lowest SU(3) baryon nonet with spin parity .
While the quenched quark models predict the lowest resonance
to be above 1600 MeV, the unquenched quark models predict it to be around
energy. Here we re-examine some old data of the \kp \to \la
reaction and find that besides the well established with
, there is indeed some evidence for the possible existence of a new
resonance with around the same mass but with broader
decay width. Higher statistic data on relevant reactions are needed to clarify
the situation.Comment: 7 pages, 4 figure
Intrinsic Spin Hall Effect in the Two Dimensional Hole Gas
We show that two types of spin-orbit coupling in the 2 dimensional hole gas
(2DHG), with and without inversion symmetry breaking, contribute to the
intrinsic spin Hall effect\cite{murakami2003,sinova2003}. Furthermore, the
vertex correction due to impurity scattering vanishes in both cases, in sharp
contrast to the case of usual Rashba coupling in the electron band. Recently,
the spin Hall effect in a hole doped semiconductor has been observed
experimentally by Wunderlich \emph{et al}\cite{wunderlich2004}. From the fact
that the life time broadening is smaller than the spin splitting, and the fact
impurity vertex corrections vanish in this system, we argue that the observed
spin Hall effect should be in the intrinsic regime.Comment: Minor typos fixed, one reference adde
Translational cooling and storage of protonated proteins in an ion trap at subkelvin temperatures
Gas-phase multiply charged proteins have been sympathetically cooled to
translational temperatures below 1 K by Coulomb interaction with laser-cooled
barium ions in a linear ion trap. In one case, an ensemble of 53 cytochrome c
molecules (mass ~ 12390 amu, charge +17 e) was cooled by ~ 160 laser-cooled
barium ions to less than 0.75 K. Storage times of more than 20 minutes have
been observed and could easily be extended to more than an hour. The technique
is applicable to a wide variety of complex molecules.Comment: same version as published in Phys. Rev.
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