742 research outputs found
Calculation of the current noise spectrum in mesoscopic transport: an efficient quantum master equation approach
Based on our recent work on quantum transport [Li et al., Phys. Rev. B 71,
205304 (2005)], where the calculation of transport current by means of quantum
master equation was presented, in this paper we show how an efficient
calculation can be performed for the transport noise spectrum. Compared to the
longstanding classical rate equation or the recently proposed quantum
trajectory method, the approach presented in this paper combines their
respective advantages, i.e., it enables us to tackle both the many-body Coulomb
interactionand quantum coherence on equal footing and under a wide range of
setup circumstances. The practical performance and advantages are illustrated
by a number of examples, where besides the known results and new insights
obtained in a transparent manner, we find that this alternative approach is
much simpler than other well-known full quantum mechanical methods such as the
Landauer-B\"uttiker scattering matrix theory and the nonequilibrium Green's
function technique.Comment: 13 pages, 3 figures, submitted to PR
Full counting statistics of renormalized dynamics in open quantum transport system
The internal dynamics of a double quantum dot system is renormalized due to
coupling respectively with transport electrodes and a dissipative heat bath.
Their essential differences are identified unambiguously in the context of full
counting statistics. The electrode coupling caused level detuning
renormalization gives rise to a fast-to-slow transport mechanism, which is not
resolved at all in the average current, but revealed uniquely by pronounced
super-Poissonian shot noise and skewness. The heat bath coupling introduces an
interdot coupling renormalization, which results in asymmetric Fano factor and
an intriguing change of line shape in the skewness.Comment: 9 pages, 5 figure
Painterly Image Harmonization in Dual Domains
Image harmonization aims to produce visually harmonious composite images by
adjusting the foreground appearance to be compatible with the background. When
the composite image has photographic foreground and painterly background, the
task is called painterly image harmonization. There are only few works on this
task, which are either time-consuming or weak in generating well-harmonized
results. In this work, we propose a novel painterly harmonization network
consisting of a dual-domain generator and a dual-domain discriminator, which
harmonizes the composite image in both spatial domain and frequency domain. The
dual-domain generator performs harmonization by using AdaIN modules in the
spatial domain and our proposed ResFFT modules in the frequency domain. The
dual-domain discriminator attempts to distinguish the inharmonious patches
based on the spatial feature and frequency feature of each patch, which can
enhance the ability of generator in an adversarial manner. Extensive
experiments on the benchmark dataset show the effectiveness of our method. Our
code and model are available at
https://github.com/bcmi/PHDNet-Painterly-Image-Harmonization.Comment: Accepted by AAAI202
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