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439 results on '"HAN Xin"'

1. A unified transition mechanism from shock to detonation waves

Author

Yan, Hao, Xiong, Haochen, Han, Xin, Shi, Chongguang, and You, Yancheng

Subjects
Physics - Fluid Dynamics
Abstract

The transition of shock-to-detonation is of great significance for the investigation of supernova formation, disaster prevention and supersonic propulsion technology. In this paper, the influence Equation of shock-to-detonation transition is summarized for the oblique detonation problem from aerodynamic analysis. The Equation integrates the effects of parameters such as chemical reaction, shock intensity and wall conditions, which quantitatively explains the physical mechanism of shock-to-detonation transition in the form of mathematical expression. Comparison with numerical simulation results as well as their gradients verified the reliability of the influence Equation. Further, the influence Equation can also be used to predict the critical conditions for the transition from shock to detonation transition form. In addition to oblique detonation, the influence Equation is compatible with the deflagration-to-detonation problem for normal detonation, which shows a wide applicability.

Published
2024

2. Observation of the dual quantum spin Hall insulator by density-tuned correlations in a van der Waals monolayer

Author

Tang, Jian, Ding, Thomas Siyuan, Chen, Hongyu, Gao, Anyuan, Qian, Tiema, Huang, Zumeng, Sun, Zhe, Han, Xin, Strasser, Alex, Li, Jiangxu, Geiwitz, Michael, Shehabeldin, Mohamed, Belosevich, Vsevolod, Wang, Zihan, Wang, Yiping, Watanabe, Kenji, Taniguchi, Takashi, Bell, David C., Wang, Ziqiang, Fu, Liang, Zhang, Yang, Qian, Xiaofeng, Burch, Kenneth S., Shi, Youguo, Ni, Ni, Chang, Guoqing, Xu, Su-Yang, and Ma, Qiong

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

The convergence of topology and correlations represents a highly coveted realm in the pursuit of novel quantum states of matter. Introducing electron correlations to a quantum spin Hall (QSH) insulator can lead to the emergence of a fractional topological insulator and other exotic time-reversal-symmetric topological order, not possible in quantum Hall and Chern insulator systems. However, the QSH insulator with quantized edge conductance remains rare, let alone that with significant correlations. In this work, we report a novel dual QSH insulator within the intrinsic monolayer crystal of TaIrTe4, arising from the interplay of its single-particle topology and density-tuned electron correlations. At charge neutrality, monolayer TaIrTe4 demonstrates the QSH insulator that aligns with single-particle band structure calculations, manifesting enhanced nonlocal transport and quantized helical edge conductance. Interestingly, upon introducing electrons from charge neutrality, TaIrTe4 only shows metallic behavior in a small range of charge densities but quickly goes into a new insulating state, entirely unexpected based on TaIrTe4's single-particle band structure. This insulating state could arise from a strong electronic instability near the van Hove singularities (VHS), likely leading to a charge density wave (CDW). Remarkably, within this correlated insulating gap, we observe a resurgence of the QSH state, marked by the revival of nonlocal transport and quantized helical edge conduction. Our observation of helical edge conduction in a CDW gap could bridge spin physics and charge orders. The discovery of a dual QSH insulator introduces a new method for creating topological flat minibands via CDW superlattices, which offer a promising platform for exploring time-reversal-symmetric fractional phases and electromagnetism., Comment: 23 pages, 15 figures, submitted version

Published
2024
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13. Dual quantum spin Hall insulator by density-tuned correlations in TaIrTe4

Author

Tang, Jian, Ding, Thomas Siyuan, Chen, Hongyu, Gao, Anyuan, Qian, Tiema, Huang, Zumeng, Sun, Zhe, Han, Xin, Strasser, Alex, Li, Jiangxu, Geiwitz, Michael, Shehabeldin, Mohamed, Belosevich, Vsevolod, Wang, Zihan, Wang, Yiping, Watanabe, Kenji, Taniguchi, Takashi, Bell, David C., Wang, Ziqiang, Fu, Liang, Zhang, Yang, Qian, Xiaofeng, Burch, Kenneth S., Shi, Youguo, Ni, Ni, Chang, Guoqing, Xu, Su-Yang, and Ma, Qiong

Published
2024
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