638 research outputs found
Kondo regime of the impurity spectral function and the current noise spectrum in the double impurity Anderson model
The dissipaton equations of motion (DEOM) method is one of the most popular
methods for simulating quantum impurity systems. In this article, we use DOEM
theory to deal with the Kondo problem of the double quantum dots (DQDs)
impurity system. We focus on the impurity spectral function and the total noise
spectral function, this two function will be used to describe the Kondo effect
of this system. The influence of the interaction, the hooping and the
difference of the chemical potential between the two dots on the Kondo effect
of the system is studied. We find that the interaction between the two dots can
influence the Kondo effect of the system a lot
1000 fps computational ghost imaging using LED-based structured illumination
: Single-pixel imaging uses a single-pixel detector, rather than a focal plane detector
array, to image a scene. It provides advantages for applications such as multi-wavelength,
three-dimensional imaging. However, low frame rates have been a major obstacle inhibiting
the use of computational ghost imaging technique in wider applications since its invention
one decade ago. To address this problem, a computational ghost imaging scheme, which
utilizes an LED-based, high-speed illumination module is presented in this work. At 32 × 32
pixel resolution, the proof-of-principle system achieved continuous imaging with 1000 fps
frame rate, approximately two orders larger than those of other existing ghost imaging
systems. The proposed scheme provides a cost-effective and high-speed imaging technique
for dynamic imaging application
General bubble expansion at strong coupling
The strongly-coupled system like the quark-hadron transition (if it is of
first order) is becoming an active play-yard for the physics of cosmological
first-order phase transitions. However, the traditional field theoretic
approach to strongly-coupled first-order phase transitions is of great
challenge, driving recent efforts from holographic dual theories with explicit
numerical simulations. These holographic numerical simulations have revealed an
intriguing linear correlation between the phase pressure difference (pressure
difference away from the wall) to the non-relativistic terminal velocity of an
expanding planar wall, which has been reproduced analytically alongside both
cylindrical and spherical walls from perfect-fluid hydrodynamics in our
previous study but only for a bag equation of state. We have also found in our
previous study a universal quadratic correlation between the wall pressure
difference (pressure difference near the bubble wall) to the non-relativistic
terminal wall velocity regardless of wall geometries. In this paper, we will
generalize these analytic relations between the phase/wall pressure difference
and terminal wall velocity into a more realistic equation of state beyond the
simple bag model, providing the most general predictions so far for future
tests from holographic numerical simulations of strongly-coupled first-order
phase transitionsComment: 22 pages, 10 figure
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