There has been a notable surge of interest in neuromorphic network computation, particularly concerning both non-volatile and volatile threshold devices. In this research, we have developed a multi-layer thin film architecture consisting of Al/AlN/Ag/AlN/Pt, which functions as a threshold switching (TS) device characterized by rapid switching speeds of 50 ns and minimal leakage current. We have effectively demonstrated biological neuron-like behaviors, such as threshold-driven spikes, all-or-nothing spikes, intensity-modulated frequency response, and frequency-modulated frequency response, through the deployment of a leaky integrate-and-fire (LIF) artificial neuron circuit, which surpasses earlier neuronal models. The resistance switching mechanism of the device is likely due to the migration of nitrogen vacancies in conjunction with silver filaments. This threshold switching device shows significant potential for applications in next-generation artificial neural networks.
The Rice−Mele model has been a seminal prototypical model for the study of topological phenomena such as Thouless pumping. Here we implement the interacting Rice−Mele model using a superconducting quantum processor comprising a one-dimensional array of 36 qutrits. By adiabatically cycling the qutrit frequencies and hopping strengths in the parametric space, we emulate the Thouless pumping of single and two bounded microwave photons along the qutrit chain. Furthermore, with strong Hubbard interaction inherent in the qutrits we also emulate the intriguing phenomena of resonant tunneling and asymmetric edge-state transport of two interacting photons. Utilizing the interactions and higher energy levels in such fully controlled synthetic quantum simulators, these results demonstrate new opportunities for exploring exotic topological phases and quantum transport phenomena using superconducting quantum circuits.
Fe3GaTe2 has attracted significant interest due to its intrinsic room-temperature ferromagnetism, yet its magnetic interactions remain debated. We thoroughly investigate the magnetism of Fe3GaTe2 using critical analysis, nitrogen−vacancy (NV) center magnetometry, and Density Function Theory (DFT). Our critical phenomenon analysis with exponents [
Significant progress has been made in high-power ultrafast laser technology since the development of diode-pumped solid-state laser systems. Three main types of diode-pumped laser systems, InnoSlab, fiber, and thin disk lasers, offer highly efficient cooling geometries that are essential for high-power ultrafast amplifiers. These systems employ amplifier chain configurations customized to their individual geometries, scaling the low-power seed lasers to high power via multi-pass, multi-stage, and regenerative amplification techniques. The partially end-pumped InnoSlab amplifier is distinguished by its slab-shaped gain medium and a highly compact design. This design offers a large surface-to-volume ratio, moderate gain per pass, and reduced nonlinear effects, facilitating the amplification of low-power ultrafast seed laser pulses to kilowatt-level output power at high repetition rates in the multi-MHz range. This review highlights the characteristics of InnoSlab technology and its amplifier configurations, discussing recent advancements in new cavity designs aimed at enhancing gain and beam quality. Additionally, it covers the mechanisms of generating high peak power few-cycle pulses, including non-linear post-pulse compression. The review also explores the potential applications of InnoSlab systems for generating extreme ultraviolet (XUV) and terahertz (THz) frequencies.
A novel cryogenic MgF molecular beam, characterized by high flux and exceptional stability, has been successfully generated within a helium buffer gas environment. This achievement is facilitated by the innovative use of an in-cell stepper motor, which continuously rotates the sample rod during laser ablation. Through meticulous optimization of the ablation laser energy, the position of the ablation spot, and the gas flow rate, among other critical parameters, the resulting MgF beam exhibits a remarkable forward velocity of 209 m/s and an impressive brightness of approximately 1.36 × 1012 molecules per pulse per steradian per internal state. Subsequent attempts at one-dimensional Doppler cooling of the MgF beam have been made, with theoretical calculations closely aligning with experimental outcomes. These findings demonstrate a significant compression in the transverse spatial distribution of the molecular beam, from 7.8 to 6.5 mm, and a substantial cooling of the transverse temperature, from 8.1 to 5.6 mK. This work lays a crucial foundation for the advancement of molecular slowing and magneto-optical trapping techniques for MgF molecules.
