2,156 research outputs found
Pair density wave characterized by a hidden string order parameter
A composite pairing structure of superconducting state is revealed by density
matrix renormalization group study in a two-leg - model. The pairing
order parameter is composed of a pairing amplitude and a phase factor, in which
the latter explicitly depends on the spin background with an analytic form
identified in the anisotropic limit as the interchain hopping integral
. Such a string-like phase factor is responsible for a
pair density wave (PDW) induced by spin polarization with a wavevector
( the magnetization). By contrast, the pairing
amplitude remains smooth, unchanged by the PDW. In particular, a local spin
polarization can give rise to a sign change of the order parameter across the
local defect. Unlike in an Fulde-Ferrell-Larkin-Ovchinnikov state, the nonlocal
phase factor here plays a role as the new order parameter characterizing the
PDW, whose origin can be traced back to the essential sign structure of the
doped Mott insulator.Comment: 10 pages, 8 figure
The effects of the little Higgs models on production via collision at linear colliders
In the frameworks of the littlest Higgs() model and its extension with
T-parity(), we studied the associated production process at the future linear colliders
up to QCD next-to-leading order. We present the regions of
parameter space in which the and effects can and cannot be
discovered with the criteria assumed in this paper. The production rates of
process in different photon polarization
collision modes are also discussed. We conclude that one could observe the
effects contributed by the or model on the cross section for the
process in a reasonable parameter
space, or might put more stringent constraints on the / parameters in
the future experiments at linear colliders.Comment: 22 pages, 25 figures, version to appear in Phys. Rev.
Does Graph Distillation See Like Vision Dataset Counterpart?
Training on large-scale graphs has achieved remarkable results in graph
representation learning, but its cost and storage have attracted increasing
concerns. Existing graph condensation methods primarily focus on optimizing the
feature matrices of condensed graphs while overlooking the impact of the
structure information from the original graphs. To investigate the impact of
the structure information, we conduct analysis from the spectral domain and
empirically identify substantial Laplacian Energy Distribution (LED) shifts in
previous works. Such shifts lead to poor performance in cross-architecture
generalization and specific tasks, including anomaly detection and link
prediction. In this paper, we propose a novel Structure-broadcasting Graph
Dataset Distillation (SGDD) scheme for broadcasting the original structure
information to the generation of the synthetic one, which explicitly prevents
overlooking the original structure information. Theoretically, the synthetic
graphs by SGDD are expected to have smaller LED shifts than previous works,
leading to superior performance in both cross-architecture settings and
specific tasks. We validate the proposed SGDD across 9 datasets and achieve
state-of-the-art results on all of them: for example, on the YelpChi dataset,
our approach maintains 98.6% test accuracy of training on the original graph
dataset with 1,000 times saving on the scale of the graph. Moreover, we
empirically evaluate there exist 17.6% ~ 31.4% reductions in LED shift crossing
9 datasets. Extensive experiments and analysis verify the effectiveness and
necessity of the proposed designs. The code is available in the GitHub
repository: https://github.com/RingBDStack/SGDD.Comment: Accepted by NeurIPS 202
- …