1,189 research outputs found
Rotational Corrections to in the NJL Model and Charge Conjugation
We show that the rotational corrections to , derived using the
semiclassical quantization scheme in the NJL model, possess correct properties
under charge conjugation.Comment: 4 pages, revtex, no figures, final version published in
Phys.Rev.C52(1995)42
A generalized Ramsey excitation scheme with suppressed light shift
We experimentally investigate a recently proposed optical excitation scheme
[V.I. Yudin et al., Phys. Rev. A 82, 011804(R)(2010)] that is a generalization
of Ramsey's method of separated oscillatory fields and consists of a sequence
of three excitation pulses. The pulse sequence is tailored to produce a
resonance signal which is immune to the light shift and other shifts of the
transition frequency that are correlated with the interaction with the probe
field. We investigate the scheme using a single trapped 171Yb+ ion and excite
the highly forbidden 2S1/2-2F7/2 electric-octupole transition under conditions
where the light shift is much larger than the excitation linewidth, which is in
the Hertz range. The experiments demonstrate a suppression of the light shift
by four orders of magnitude and an immunity against its fluctuations.Comment: 5 pages, 4 figure
Atomic clocks with suppressed blackbody radiation shift
We develop a nonstandard concept of atomic clocks where the blackbody
radiation shift (BBRS) and its temperature fluctuations can be dramatically
suppressed (by one to three orders of magnitude) independent of the
environmental temperature. The suppression is based on the fact that in a
system with two accessible clock transitions (with frequencies v1 and v2) which
are exposed to the same thermal environment, there exists a "synthetic"
frequency v_{syn} (v1-e12 v2) largely immune to the BBRS. As an example, it is
shown that in the case of ion 171Yb+ it is possible to create a clock in which
the BBRS can be suppressed to the fractional level of 10^{-18} in a broad
interval near room temperature (300\pm 15 K). We also propose a realization of
our method with the use of an optical frequency comb generator stabilized to
both frequencies v1 and v2. Here the frequency v_{syn} is generated as one of
the components of the comb spectrum and can be used as an atomic standard.Comment: 5 pages, 2 figure
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