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11,180 results on '"Xu, Bing"'

1. Phase space analysis of the evolution of the early universe in Einstein-Cartan theory

Author

Huang, Qihong, Huang, He, Xu, Bing, Zhang, Kaituo, and Chen, Hao

Subjects
General Relativity and Quantum Cosmology
Abstract

In this paper, we perform the phase space analysis to investigate the evolution of the early universe in Einstein-Cartan theory. By studying the stability of critical points in dynamical system, it is found that there exist two stable critical points which represent an expanding solution and an Einstein static solution respectively. After analyzing the phase diagram of the dynamical system, we find that there may exist a bouncing universe, an oscillating universe or an Einstein static universe in the early time of universe. In addition, by assuming that the early universe filled by the radiation with $\omega= 1/3$ , the initial states of the early universe are Einstein static universe or oscillating universe. When the equation of state $\omega$ decreases with time, the universe can exit from the initial state and evolve into an expanding phase.

Published
2024

2. Sign-reversal Anomalous Hall effect driven by a magnetic transition in Cr$_{7-\delta}$Te$_8$

Author

Chen, Bowen, Wu, Xiaokai, Liao, Zhiyu, Fu, Zhendong, Xu, Bing, Wang, Meng, and Shen, Bing

Subjects
Condensed Matter - Materials Science
Abstract

The search for exotic spin configurations and related novel transport properties continues to be fueled by the promise of new electronic states and outstanding candidate components for spintronic applications. In layered Cr$_{7-\delta}$Te$_8$, the applied field drives a before unreported magnetic transition revealed by the alternating current magnetic susceptibility measurements around room temperature. This observed magnetic transition results in a sign change for the anomalous Hall effect which exhibits non-monotonous temperature dependence. The prominent topological Hall effect (THE) with a large value of 1$\mu \Omega \cdot cm$ has been observed without breaking the inversion symmetry for Cr$_{7-\delta}$Te$_8$. This robust THE can persist up to room temperature attributed to the nonzero fluctuation-driven scalar spin chirality. The complicated interactions of long-range and short-range magnetic orders lead to rich exotic magnetic states with related novel transport properties in Cr$_{7-\delta}$Te$_8$.

Published
2024

3. Polarized Charge Dynamics of a Novel Charge Density Wave in Kagome FeGe

Author

Yi, Shaohui, Liao, Zhiyu, Wang, Qi, Ma, Haiyang, Liu, Jianpeng, Teng, Xiaokun, Dai, Pengcheng, Dai, Yaomin, Zhao, Jianzhou, Qi, Yanpeng, Xu, Bing, and Qiu, Xianggang

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We report on the charge dynamics of kagome FeGe, an antiferromagnet with a charge density wave (CDW) transition at $T_{\mathrm{CDW}} \simeq 105$ K, using polarized infrared spectroscopy and band structure calculations. We reveal a pronounced optical anisotropy, various excitations associated with flat bands and van Hove singularities (VHSs), and a moderate level of electronic correlations. Notably, there are two types of remarkable spectral weight (SW) redistributions for above and below $T_{\mathrm{CDW}}$. The former involves a transfer between incoherent and coherent excitations driven by the magnetic splitting-induced elevation of flat bands. The latter manifests itself as a sudden change of SW from low to high energies for both $a$ and $c$ directions, suggesting a first-order transition and the three-dimensional nature of CDW. These anomalies in SW significantly differ from those observed in other kagome metals like CsV$_3$Sb$_5$, where the nesting of VHSs results in a pronounced CDW gap feature. Instead, our findings can be accounted for by the jump of VHSs relative to the Fermi energy via a first-order structural transition involving large partial Ge1-dimerization. Our study thus unveils a complex interplay among structure, magnetism, electronic correlations, and charge order in FeGe, offering valuable insights for a comprehensive understanding of CDW order in kagome systems., Comment: 7 pages, 3 figures

Published
2024

4. Constant-roll inflation and primordial black holes with Barrow holographic dark energy

Author

Huang, Qihong, Huang, He, Xu, Bing, and Zhang, Kaituo

Subjects
General Relativity and Quantum Cosmology
Abstract

We investigate the constant-roll inflation and the evolution of primordial black holes (PBHs) with Barrow holographic dark energy (BHDE). Using the modified Friedmann equation and the constant-roll condition in BHDE model, we calculate the constant-roll parameters, the scalar spectral index parameter and the tensor-to-scalar ratio with the chaotic potential $V_{0}\phi^{n}$. Then, we show that a suitable value of the power exponent is $n=1$ by using the Planck 2018 data. Considering the accretion process and the evaporation due to Hawking radiation, we discuss the evolution of PBHs in BHDE model and obtain that the PBHs mass is in the mass window of PBHs.

Published
2024

5. Joint Constraints on the Hubble Constant, Spatial Curvature, and Sound Horizon from the Late-time Universe with Cosmography

Author

Zhang, Kaituo, Zhou, Tianyao, Xu, Bing, Huang, Qihong, and Yuan, Yangsheng

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract

In this paper, using the latest Pantheon+ sample of Type Ia supernovae (SNe Ia), Baryon Acoustic Oscillation (BAO) measurements, and observational Hubble data (OHD), we carry out a joint constraint on the Hubble constant $H_0$, the spatial curvature $\Omega_{\rm K}$, and the sound horizon at the end of drag epoch $r_{\rm d}$. To be model-independent, four cosmography models, i.e., the Taylor series in terms of redshift $y_1=z/(1+z)$, $y_2=\arctan(z)$, $y_3=\ln(1+z)$, and the Pad\'e approximants, are used without the assumption of flat Universe. The results show that the $H_0$ is anti-correlated with $\Omega_{\rm K}$ and $r_{\rm d}$, indicating smaller $\Omega_{\rm K}$ or $r_{\rm d}$ would be helpful in alleviating the Hubble tension. And the values of $H_0$ and $r_{\rm d}$ are consistent with the estimate derived from the Planck Cosmic Microwave Background (CMB) data based on the flat $\Lambda$CDM model, but $H_0$ is in 2.3$\sim$3.0$\sigma$ tension with that obtained by \cite{Riess2022} in all these cosmographic approaches. Meanwhile, a flat Universe is preferred by the present observations under all approximations except the third order of $y_1$ and $y_2$ of the Taylor series. Furthermore, according to the values of the Bayesian evidence, we found that the flat $\Lambda$CDM remains to be the most favored model by the joint datasets, and the Pad\'e approximant of order (2,2), the third order of $y_3$ and $y_1$ are the top three cosmographic expansions that fit the datasets best, while the Taylor series in terms of $y_2$ are essentially ruled out., Comment: 18 pages, 4 figures

Published
2023
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6. Visualization of skyrmion-superconducting vortex pairs in a chiral magnet-superconductor heterostructure

Author

Xie, Yongjie, Qian, Ang, He, Bin, Wu, Yubiao, Wang, Sheng, Xu, Bing, Yu, Guoqiang, Han, Xiufeng, and Qiu, Xianggang

Subjects
Condensed Matter - Superconductivity
Abstract

Magnetic skyrmions, the topological states possessing chiral magnetic structure with non-trivial topology, have been widely investigated as a promising candidate for spintronic devices. They can also couple with superconducting vortices to form skyrmion-vortex pairs, hosting Majorana zero mode which is a potential candidate for topological quantum computering. A lot of theoretical proposals have been put forward on constructing skyrmion-vortex pairs in heterostructures of chiral magnet and superconductor. Nevertheless, how to generate skyrmion-vortex pairs in a controllable way experimentally remains a significant challenge. We have designed a heterostructure of chiral magnet and superconductor [CoFeB/Ir/Ta]7/Nb in which zero field N\'eel-type skyrmions can be stabilized and the superconducting vortices can couple with the skyrmions when Nb is in the superconducting state. We have directly observed the formation of skyrmion-superconducting vortex pairs which is dependent on the direction of the applied magnetic field. Our results provide an effective method to manipulate the quantum states of skyrmions with the help of superconducting vortices, which can be used to explore the possible existence of Majorana zero mode for future quantum computation., Comment: 17 pages, 3 figures

Published
2023

31. Environmental and human history in the hyper-arid eastern Tarim Basin (Lop Nur), northwest China: A critical review for sustaining the natural and cultural landscapes

Author

Li, Kangkang, primary, Qin, Xiaoguang, additional, Xu, Bing, additional, Zhang, Lei, additional, Mu, Guijin, additional, Wu, Yong, additional, Tian, Xiaohong, additional, Wei, Dong, additional, Wang, Chunxue, additional, Shao, Huiqiu, additional, Jia, Hongjuan, additional, Yin, Zhiqiang, additional, Li, Wen, additional, Song, Haoze, additional, Lin, Yongchong, additional, Jiao, Yingxin, additional, Feng, Jing, additional, and Liu, Jiaqi, additional

Published
2024
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32. Association analysis of an anti-obesity mechanism and key ripened Pu-erh tea bioactive components by mimicking human general tea drinking

Author

Liu, Junyu, additional, Song, Zhengyang, additional, Chen, Haihong, additional, Zeng, Wen, additional, Han, Guirong, additional, Li, Wei, additional, Xu, Bing, additional, Lu, Yuan, additional, Zhang, Canyang, additional, Xue, Zhenglian, additional, Lü, Bin, additional, Zhang, Chong, additional, Yang, Song, additional, Wang, Yi, additional, and Xing, Xinhui, additional

Published
2024
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38. Molecular insights into G protein specificity and biased agonism at the β2-adrenergic receptor

Author

Casiraghi, Marina, primary, Wang, Haoqing, additional, Brennan, Patrick, additional, Habrian, Chris, additional, Hubner, Harald, additional, Schmidt, Maximilian F, additional, Maul, Luis, additional, Pani, Biswaranjan, additional, Bahriz, Sherif MFM, additional, Xu, Bing, additional, White, Elizabeth, additional, Sunahara, Roger K, additional, Xiang, Yang K, additional, Lefkowitz, Robert J, additional, Isacoff, Ehud Y, additional, Nucci, Nathaniel, additional, Gmeiner, Peter, additional, Lerch, Michael, additional, and Kobilka, Brian K, additional

Published
2024
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44. CACA guidelines for holistic integrative management of adult acute myeloid leukemia

Author

Wei, Hui, primary, Mi, Yingchang, additional, Wang, Ying, additional, Jiang, Erlie, additional, Hu, Jianda, additional, Yan, Xiaojing, additional, Han, Yanqiu, additional, Lai, Yongrong, additional, You, Yong, additional, Gao, Sujun, additional, Gao, Chunji, additional, Xu, Bing, additional, Yu, Wenjuan, additional, Chen, Jieping, additional, Chen, Suning, additional, Gong, Tiejun, additional, Yang, Linhua, additional, Yang, Jianmin, additional, Du, Xin, additional, Li, Wei, additional, Li, Fei, additional, Li, Yan, additional, Li, Jian, additional, Li, Junmin, additional, Jin, Jie, additional, Zhang, Xi, additional, Zhang, Mei, additional, Zhang, Yu, additional, Zhang, Guangsen, additional, Song, Xianmin, additional, Song, Yongping, additional, Jiang, Qian, additional, Wu, Tong, additional, Liu, Ting, additional, Liu, Zhuogang, additional, Liu, Daihong, additional, Ren, Hanyun, additional, Feng, Ru, additional, Fu, Rong, additional, Zhu, Honghu, additional, Sun, Zimin, additional, Wang, Jianmin, additional, Wang, Xin, additional, Wang, Jishi, additional, Wang, Shaoyuan, additional, Fang, Meiyun, additional, Huang, He, additional, Hu, Yu, additional, Liu, Qifa, additional, Ma, Jun, additional, Shen, Zhixiang, additional, Wu, Depei, additional, Huang, Xiaojun, additional, Zhou, Jianfeng, additional, Ji, Chunyan, additional, Qiu, Lugui, additional, Li, Jianyong, additional, and Wang, Jianxiang, additional

Published
2024
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46. Promoting Nanoscale Deformation Twinning through FCC Phase Decomposition in AlCoCrFeMo0.05Ni2 High Entropy Alloy

Author

Ye, Qilu, primary, Zhang, Zifeng, additional, Wang, Qingyao, additional, Xu, Xueyan, additional, Wang, Kesheng, additional, Zhao, Jiqing, additional, Xu, Bing, additional, Zhang, Jun, additional, Liu, Dongdong, additional, Deng, Yadan, additional, Qian, Xun, additional, Wu, Qilin, additional, Wang, Yuan, additional, and Cao, Qian, additional

Published
2024
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48. Fragility index analysis for randomized controlled trials of approved biologicals and small molecule drugs in inflammatory bowel diseases

Author

Bai, Xiaoyin, primary, Wan, Ziqi, additional, Li, Yi, additional, Jiang, Qingwei, additional, Wu, Xia, additional, Xu, Bing, additional, Li, Xiang, additional, Zhou, Runing, additional, Mi, Jiarui, additional, Sun, Yinghao, additional, Ruan, Gechong, additional, Han, Wei, additional, Li, Guanqiao, additional, and Yang, Hong, additional

Published
2024
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