14,591 research outputs found
Coherent Dark States of Rubidium 87 in a Buffer Gas using Pulsed Laser Light
The coherent dark resonance between the hyperfine levels F=1, m=0 and F=2,
m=0 of the rubidium ground state has been observed experimentally with the
light of a pulsed mode-locked diode laser operating at the D1 transition
frequency. The resonance occurs whenever the pulse repetition frequency matches
an integer fraction of the rubidium 87 ground state hyperfine splitting of 6.8
GHz. Spectra have been taken by varying the pulse repetition frequency. Using
cells with argon as a buffer gas a linewidth as narrow as 149 Hz was obtained.
The rubidium ground state decoherence cross section 1.1*10^(-18) cm^2 for
collisions with xenon atoms has been measured for the first time with this
method using a pure isotope rubidium vapor cell and xenon as a buffer gas.Comment: 3 pages, 5 figures, 1 misprint correcte
Measurement of the vortex-core radius by scanning tunneling microscopy
Using a scanning tunneling microscope operated in a spectroscopic mode we imaged flux-line lattices in niobium diselenide at various external magnetic fields. From the evaluation of a large number of tunneling-current profiles taken across the individual vortices we deduced the dependence of the vortex-code radius on the applied magnetic field. It was found that the core radius shows a pronounced decrease with increasing field, even for H/Hc2<<1. This behavior is qualitatively well characterized by self-consistent solutions of the Usadel equations
Strong coupling of a qubit to shot noise
We perform a nonperturbative analysis of a charge qubit in a double quantum
dot structure coupled to its detector. We show that strong detector-dot
interaction tends to slow down and halt coherent oscillations. The transitions
to a classical and a low-temperature quantum overdamping (Zeno) regime are
studied. In the latter, the physics of the dissipative phase transition
competes with the effective shot noise.Comment: 5 pages, 4 figure
Exotic composites: the decay of deficit angles in global-local monopoles
We study static, spherically symmetric, composite global-local monopoles with
a direct interaction term between the two sectors in the regime where the
interaction potential is large. At some critical coupling the global defect
disappears and with it the deficit angle of the space-time. We find new
solutions which represent local monopoles in an Anti-de-Sitter spacetime. In
another parameter range the magnetic monopole, or even both, disappear. The
decay of the magnetic monopole is accompanied by a dynamical transition from
the higgsed phase to the gauge-symmetric phase. We comment on the applications
to cosmology, topological inflation and braneworlds.Comment: 17 pages, 11 figures; Minor corrections, matches published versio
Black strings in (4+1)-dimensional Einstein-Yang-Mills theory
We study two classes of static uniform black string solutions in a
(4+1)-dimensional SU(2) Einstein-Yang-Mills model. These configurations possess
a regular event horizon and corresponds in a 4-dimensional picture to axially
symmetric black hole solutions in an Einstein-Yang-Mills-Higgs-U(1)-dilaton
theory. In this approach, one set of solutions possesses a nonzero magnetic
charge, while the other solutions represent black holes located in between a
monopole-antimonopole pair. A detailed analysis of the solutions' properties is
presented, the domain of existence of the black strings being determined. New
four dimensional solutions are found by boosting the five dimensional
configurations. We also present an argument for the non-existence of finite
mass hyperspherically symmetric black holes in SU(2) Einstein-Yang-Mills
theory.Comment: 19 Revtex pages, 27 eps-figures; discussion on rotating black holes
modifie
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