3,774 research outputs found
Unipolar Resistance Switching in Amorphous High-k dielectrics Based on Correlated Barrier Hopping Theory
We have proposed a kind of nonvolatile resistive switching memory based on
amorphous LaLuO3, which has already been established as a promising candidate
of high-k gate dielectric employed in transistors. Well-developed unipolar
switching behaviors in amorphous LaLuO3 make it suited for not only logic but
memory applications using the conventional semiconductor or the emerging
nano/CMOS architectures. The conduction transition between high- and low-
resistance states is attributed to the change in the separation between oxygen
vacancy sites in the light of the correlated barrier hopping theory. The mean
migration distances of vacancies responsible for the resistive switching are
demonstrated in nanoscale, which could account for the ultrafast programming
speed of 6 ns. The origin of the distributions in switching parameters in
oxides can be well understood according to the switching principle.
Furthermore, an approach has also been developed to make the operation voltages
predictable for the practical applications of resistive memories.Comment: 18 pages, 6 figure
Field-induced topological pair-density wave states in a multilayer optical lattice
We study the superfluid phases of a Fermi gas in a multilayer optical lattice
system in the presence of out-of-plane Zeeman field, as well as spin-orbit (SO)
coupling. We show that the Zeeman field combined with the SO coupling leads to
exotic topological pair-density wave (PDW) phases in which different layers
possess different superfluid order parameters, even though each layer
experiences the same Zeeman field and the SO coupling. We elucidate the
mechanism of the emerging PDW phases, and characterize their topological
properties by calculating the associated Chern numbers.Comment: 7 pages, 6 figures, accepted by Phys. Rev.
The asymmetric effect of infectious disease equity market volatility for the physical education economy: implication for a post-Covid world
Due to the growing importance of the sports economy and the
severe impact of the current Covid-19 pandemic on it, this paper
examines the way in which the infectious disease stock market
volatility (ID-EMV) tracker affects the Covid world sports economy
from an asymmetrical perspective. We selected the newspaperbased ID-EMV index and Wind Physical Education Concept Index
(PEC) for our research. First, the results of conventional causality
tests showed that the tests ID-EMV and PEC were unable to
detect causality, implying that stock market volatility stemming
from COVID-19 risk had no impact on the sports economy.
However, considering potential asymmetric effects in this relationship, we further investigated whether ID-EMV could significantly
affect PEC under both positive and negative shocks. The empirical
results confirm the existence of asymmetric effects. Therefore, we
are the first to focus on this asymmetric effect and conduct
empirical research, which may help provide educators and financial market participants with a novel research perspective
Universal Quantification of Chemical Bond Strength and Its Application to Low Dimensional Materials
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