351 research outputs found
Floquet engineering of optical solenoids and quantized charge pumping along tailored paths in two-dimensional Chern insulators
The insertion of a local magnetic flux, as the one created by a thin
solenoid, plays an important role in gedanken experiments of quantum Hall
physics. By combining Floquet engineering of artificial magnetic fields with
the ability of single-site addressing in quantum-gas microscopes, we propose a
scheme for the realization of such local solenoid-type magnetic fields in
optical lattices. We show that it can be employed to manipulate and probe
elementary excitations of a topological Chern insulator. This includes
quantized adiabatic charge pumping along tailored paths inside the bulk, as
well as the controlled population of edge modes.Comment: 6 pages, 4 figures. Discussions and references are update
THE COMPARATIVE STUDY OF MUSCLE FORCES AND EMG PARAMETERS IN TWO FORMS OF THE STRENGTH TRAINING
By a comparative method, the differences and the relationship between the muscle forces and EMG parameters were investigated in two forms of the maximal strength training: the continuous repetition maximum voluntary contraction (MVC) and the interval repetition MVC. This study tried to provide a theoretical foundation and practice reference for the coaches in choosing the means of the strength training scientifically
Improving Scene Graph Generation with Superpixel-Based Interaction Learning
Recent advances in Scene Graph Generation (SGG) typically model the
relationships among entities utilizing box-level features from pre-defined
detectors. We argue that an overlooked problem in SGG is the coarse-grained
interactions between boxes, which inadequately capture contextual semantics for
relationship modeling, practically limiting the development of the field. In
this paper, we take the initiative to explore and propose a generic paradigm
termed Superpixel-based Interaction Learning (SIL) to remedy coarse-grained
interactions at the box level. It allows us to model fine-grained interactions
at the superpixel level in SGG. Specifically, (i) we treat a scene as a set of
points and cluster them into superpixels representing sub-regions of the scene.
(ii) We explore intra-entity and cross-entity interactions among the
superpixels to enrich fine-grained interactions between entities at an earlier
stage. Extensive experiments on two challenging benchmarks (Visual Genome and
Open Image V6) prove that our SIL enables fine-grained interaction at the
superpixel level above previous box-level methods, and significantly
outperforms previous state-of-the-art methods across all metrics. More
encouragingly, the proposed method can be applied to boost the performance of
existing box-level approaches in a plug-and-play fashion. In particular, SIL
brings an average improvement of 2.0% mR (even up to 3.4%) of baselines for the
PredCls task on Visual Genome, which facilitates its integration into any
existing box-level method
The cold-atom elevator: From edge-state injection to the preparation of fractional Chern insulators
Optical box traps for cold atoms offer new possibilities for quantum-gas
experiments. Building on their exquisite spatial and temporal control, we
propose to engineer system-reservoir configurations using box traps, in view of
preparing and manipulating topological atomic states in optical lattices.
First, we consider the injection of particles from the reservoir to the system:
this scenario is shown to be particularly well suited to activate
energy-selective chiral edge currents, but also, to prepare fractional Chern
insulating ground states. Then, we devise a practical evaporative-cooling
scheme to effectively cool down atomic gases into topological ground states.
Our open-system approach to optical-lattice settings provides a new path for
the investigation of ultracold quantum matter, including strongly-correlated
and topological phases.Comment: 15 pages, 11 figures including Supplementary materia
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