Long Zhang

Proposal for realizing unpaired Weyl points in a three-dimensional periodically driven optical Raman lattice

Xiao-Dong Lin, Jinyi Zhang, Long Zhang

In static lattice systems, the Nielsen-Ninomiya theorem enforces the pairing of Weyl points with opposite chiralities, which precludes the chiral magnetic effect (CME) in equilibrium. Periodic driving provides a viable route to circumvent this no-go constraint. Here, we propose a scheme to …

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Topology and ferrimagnetism intertwining via weak interactions in Lieb lattices

Lei Chen, Beibei Wang, Jianmin Yuan, Long Zhang et autres

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Ultracold atomic lattice systems for simulating topological phases: A review

Beibei Wang, Xiao-Dong Lin, Jinyi Zhang, Long Zhang

Owing to rapid recent progress, ultracold atomic lattice systems for simulating topological phases are now at a pivotal stage, evolving from established paradigms into increasingly versatile and programmable quantum simulators. In this review, we survey recent experimental advances across four major classes …

High Chern number quantum anomalous Hall states in Haldane-graphene multilayers

Yuejiu Zhao, Long Zhang, Fu‐Chun Zhang

We consider a rhombohedral-stacked $N$-layer graphene coupled to a monolayer of Haldane model. We show that high order Dirac points in multilayer graphene can be gapped out by topological proximity effect of the Haldane model layer, leading to total Chern number $|C|=N+1$ …

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Giant SHG Switching in a Molecular Crystal via Pressure‐Driven Conformational Isomerization

Zheng Tang, Song Wei Gao, Tianyao Pei, Dequan Jiang et autres

Abstract Second‐harmonic generation (SHG) switching materials are of great significance for advanced optoelectronic applications, and their design is often guided by the “anionic group theory”, which states that the nonlinear optical (NLO) effect of a material originates from microscopic polar groups and …

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Measuring topological invariants of even-dimensional line-gapped non-Hermitian systems through quench dynamics

Long Zhang

The accurate determination of non-Hermitian (NH) topological invariants plays a central role in the study of NH topological phases. In this work, we propose a general framework for directly measuring NH topological invariants in even-dimensional systems with real line gaps through quench …

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Schrödingerization for quantum linear systems problems with near-optimal dependence on matrix queries

Yin Ping Yang, Yue Yu, Long Zhang

We develop a quantum algorithm for linear algebraic equations $ A\bb{x} = \bb{b} $ from the perspective of Schrödingerization-form problems, which are characterized by a system of linear convection equations in one higher dimension. When $ A $ is positive definite, the …

A multidirectional wide-band piezoelectric vibration energy harvester based on the magnetic coupling effect

Shuai Duan, Yongqiang Zhu, Shiyuan Yu, Long Zhang et autres

The variability of vibration direction and the randomness of frequency in the environment pose a serious challenge to the development of efficient energy harvesting devices. Based on this, a multidirectional wide-band piezoelectric vibration energy harvester (MWB-PVEH) based on magnetic coupling effect is …

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MEMS Chip-Based Miniaturized Fiber-Optic Fabry–Pérot Sensor for Highly-Sensitive and Wide-Band Acceleration Detection

Long Zhang, Yufeng Pan, Xiaojun Chen, Siyu Liu et autres

Fiber-optic Fabry-Perot (FP) sensor has the advantages of small structural size, high sensitivity, and immunity to electromagnetic interference, which has been widely used in acceleration detection. However, due to the fact that the acceleration sensing structure is mainly based on the mass …

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Magnetic phase diagram of Cr2Te3 revisited by ac magnetostrictive coefficient

Long Zhang, Zhongzhu Jiang, Yugang Zhang, Jing Zhang et autres

Two-dimensional (2D) magnetic materials have attracted considerable interest owing to their potential applications in spintronics and fundamental investigations into low-dimensional magnetism. Cr2Te3, a quasi 2D non van der Waals magnet, exhibits a complex magnetic phase diagram due to competing magnetic interactions within …

Effect of compound addition of Ti–B on hardenability and hot ductility of 22MnB5 hot stamped steel

Yaxu Zheng, Long Zhang, Lin Yu, Jing Wang et autres

Hot stamped 22MnB5 steel has been widely used in the automotive industry due to its high strength and good toughness. At present, most hot stamped steels improve their hardenability and strength by incorporating trace amount of boron and titanium. In order to …

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Measuring non-Hermitian topological invariants directly from quench dynamics

Xiao-Dong Lin, Long Zhang

While non-Hermitian (NH) topological phases and phenomena have been observed across various quantum systems, directly measuring NH topological invariants remains a significant challenge. In this study, we present a generic and unified framework for the direct measurement of various NH topological invariants …

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