3,979 research outputs found
Many-body quantum coherence and interaction blockade in Josephson-linked Bose-Einstein condensates
We study many-body quantum coherence and interaction blockade in two
Josephson-linked Bose-Einstein condensates. We introduce universal operators
for characterizing many-body coherence without limitations on the system
symmetry and total particle number . We reproduce the results for both
coherence fluctuations and number squeezing in {\em symmetric} systems of large
, and reveal several peculiar phenomena that may occur in {\em asymmetric}
systems and systems of small . For asymmetric systems, we show that, due to
an interplay between asymmetry and inter-particle interaction, the coherence
fluctuations are suppressed dramatically when , and both
{\it resonant tunneling} and {\it interaction blockade} take place for large
values of , where and are the interaction and
tunneling energies, respectively. We emphasize that the resonant tunneling and
interaction blockade may allow creating single-atom devices with promising
technology applications. We demonstrate that for the systems at finite
temperatures the formation of self-trapped states causes an anomalous behavior.Comment: 6 pages, 5 figures, accepted for publication in EPL (Europhysics
Letters
Soliton transverse instabilities in nonlocal nonlinear media
We analyze the transverse instabilities of spatial bright solitons in
nonlocal nonlinear media, both analytically and numerically. We demonstrate
that the nonlocal nonlinear response leads to a dramatic suppression of the
transverse instability of the soliton stripes, and we derive the asymptotic
expressions for the instability growth rate in both short- and long-wave
approximations.Comment: 3 pages, 3 figure
Blooming Numbers: Interactive Visualization in Cultural Contexts Based on Numbers
The Blooming Numbers is an application based on the web for the purpose of visualizing the relationships between cultural contexts and the preference of numbers in interactive and dynamic ways. People from different cultural background have varying opinions about numbers. My basic idea was to explore effective visualization based on this interesting observation. My thesis project provides an interactive application to convey a huge amount of information about numbers, as well as a fun experience with an art work generated with diverse data provided by the users
From Laser Induced Line Narrowing To Electromagnetically Induced Transparency: Closed System Analysis
Laser induced line narrowing effect, discovered more than thirty years ago,
can also be applied to recent studies in high resolution spectroscopy based on
electromagnetically induced transparency. In this paper we first present a
general form of the transmission width of electromagnetically induced
transparency in a homogeneously broadened medium. We then analyze a Doppler
broadened medium by using a Lorentzian function as the atomic velocity
distribution. The dependence of the transmission linewidth on the driving field
intensity is discussed and compared to the laser induced line narrowing effect.
This dependence can be characterized by a parameter which can be regarded as
``the degree of optical pumping''.Comment: 8 pages, 5 figure
New parametrization for differences between plasma kinetic codes
Validation and verification of plasma kinetics codes requires the development
of quantitative methods and techniques for code comparisons. We describe two
parameters that can be used for characterization of differences between such
codes. It is shown that these parameters, which are determined from the most
general results of kinetic codes, can provide important information on the
differences between the basic rate coefficients employed. Application of this
method is illustrated by comparisons of some results from the 3rd NLTE Code
Comparison Workshop for carbon, germanium, and gold plasmas.Comment: Submitted to High Energy Density Physics, 12 pages, 2 figure
Squeezing and entanglement of matter-wave gap solitons
We study quantum squeezing and entanglement of gap solitons in a
Bose-Einstein condensate loaded into a one-dimensional optical lattice. By
employing a linearized quantum theory we find that quantum noise squeezing of
gap solitons, produced during their evolution, is enhanced compared with the
atomic solitons in a lattice-free case due to intra-soliton structure of
quantum correlations induced by the Bragg scattering in the periodic potential.
We also show that nonlinear interaction of gap solitons in dynamically stable
bound states can produce strong soliton entanglement.Comment: 4 pages, 5 figure
Why Do Women Seek Physical Beauty? : A Cross-Cultural Approach to Understand the Physical Beauty of East Asian Women
Physical beauty has been a main research agenda of the social psychology of clothing. However, the body of research that has illustrated the main reasons that women seek physical beauty has been limited. This study examined what values are sought by women through their physical beauty. The physical beauty value, a new paradigm suggested by this research, is the value acquired through the improvement of physical beauty. As the cognition of beauty is affected by sociocultural contexts (Dion et al., 1990), the physical beauty value is also formulated based on cultural characteristics. This study selected Korean, Chinese and Japanese women in their 20s and 30s, and explored their physical beauty values with a crosscultural approach. Through this perspective, this study discovered a common physical beauty value in East Asia and specific physical beauty values salient in each culture
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