Communications in Physics

New Physics in the 3-3-1 models

Hoang Ngoc Long — 2024-08-30

Two main ingredients of current particle physics such as local gauge symmetry and mass generation via the Higgs mechanism being basic ground of the Standard Model are widely confirmed by experimental data. However, some problems such as neutrino masses, dark matter, baryon asymmetry of Universe have clearly indicated that the Standard Model cannot be the ultimate theory of nature. To surpass the mentioned puzzles, many extensions of the Standard Model (called beyond Standard Model) have been proposed. Among beyond Standard Models, the 3-3-1 models have some intriguing features and they get wide attention. The pioneer models develop in some directions. In this paper, new main versions of the 3-3-1 models and their consequences are presented.

Multiple mobility edges in quasi-periodic mosaic lattices revisited: A numerical study based on time-dependent reflection

Phi Ba Nguyen — 2024-09-05

The dynamics of a short wave packet in one-dimensional quasi-periodic lattices with mosaic modulated on-site potentials is investigated numerically. This model is characterized by the modulation period $\kappa$ and the quasi-periodic potential strength $\lambda$. For parabolic wave packets with a given central energy $E_{0}$, we calculate the averaged time-dependent reflectance, $\langle R(t) \rangle$, for various values of $\kappa$ and $\lambda$. From the extensive numerical calculations, we show that there exist multiple mobility edges in such a model with the number of mobility edges to be always equal to $2(\kappa-1)$.

Analysis of ionic defect distribution on perovskite photodetector by temperature-depend deep level transient spectroscopy

Thi Kim Oanh Vu — 2024-08-30

The High-efficiency Organohalide perovskites solar cells are produced via a solution-based method. Thus, a lot of defects are inevitable generated during fabrication processes, which are the main factors that affect the efficiency and long-term stability. The defect has been linked to the observation of reduce device stability against degradation and it can also create mid-gap states in a band structure as well act as recombination centers. Although the efficiency of the perovskite solar cells (PSCs) has been improved by curing defects using various passivation methods, deeply trapped defects in the perovskite layer have not been systematically studied, and their function is still unclear. In this study, we perform temperature-dependent deep-level transient spectroscopy (T-DLTS) measurements on PSCs, ionic defect parameters (activation energy, trap density, diffusion constants) for each observed ionic species were compared in different PSCs.