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