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578 results on '"Xu, Shengnan"'

3. Direct visualization of electric current induced dipoles of atomic impurities

Author

Liu, Yaowu, Zhang, Zichun, Chen, Sidan, Xu, Shengnan, Ji, Lichen, Chen, Wei, Zhou, Xinyu, Luo, Jiaxin, Hu, Xiaopen, Duan, Wenhui, Chen, Xi, Xue, Qi-Kun, and Ji, Shuai-Hua

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

Learning the electron scattering around atomic impurities is a fundamental step to fully understand the basic electronic transport properties of realistic conducting materials. Although many efforts have been made in this field for several decades, atomic scale transport around single point-like impurities has yet been achieved. Here, we report the direct visualization of the electric current induced dipoles around single atomic impurities in epitaxial bilayer graphene by multi-probe low temperature scanning tunneling potentiometry as the local current density is raised up to around 25 A/m, which is considerably higher than that in previous studies. We find the directions of these dipoles which are parallel or anti-parallel to local current are determined by the charge polarity of the impurities, revealing the direct evidence for the existence of the carrier density modulation effect proposed by Landauer in 1976. Furthermore, by $in$ $situ$ tuning local current direction with contact probes, these dipoles are redirected correspondingly. Our work paves the way to explore the electronic quantum transport phenomena at single atomic impurity level and the potential future electronics toward or beyond the end of Moore's Law.

Published
2023

4. Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe)$_{1.14}$NbSe$_2$

Author

Zhong, Haoyuan, Zhang, Hongyun, Zhang, Haoxiong, Bao, Ting, Zhang, Kenan, Xu, Shengnan, Luo, Laipeng, Rousuli, Awabaikeli, Yao, Wei, Denlinger, Jonathan D., Huang, Yaobo, Wu, Yang, Xu, Yong, Duan, Wenhui, and Zhou, Shuyun

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Van der Waals superlattices are important for tailoring the electronic structures and properties of layered materials. Here we report the superconducting properties and electronic structure of a natural van der Waals superlattice (PbSe)$_{1.14}$NbSe$_2$. Anisotropic superconductivity with a transition temperature $T_c$ = 5.6 $\pm$ 0.1 K, which is higher than monolayer NbSe$_2$, is revealed by transport measurements on high-quality samples. Angle-resolved photoemission spectroscopy (ARPES) measurements reveal the two-dimensional electronic structure and a charge transfer of 0.43 electrons per NbSe$_2$ unit cell from the blocking PbSe layer. In addition, polarization-dependent ARPES measurements reveal a significant circular dichroism with opposite contrast at K and K' valleys, suggesting a significant spin-orbital coupling and distinct orbital angular momentum. Our work suggests natural van der Waals superlattice as an effective pathway for achieving intriguing properties distinct from both the bulk and monolayer samples., Comment: 8 pages, 4 figures

Published
2023
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27. Tailored Ising superconductivity in intercalated bulk NbSe2

Author

Zhang, Haoxiong, Rousuli, Awabaikeli, Zhang, Kenan, Luo, Laipeng, Guo, Chenguang, Cong, Xin, Lin, Zuzhang, Bao, Changhua, Zhang, Hongyun, Xu, Shengnan, Feng, Runfa, Shen, Shengchun, Zhao, Kun, Yao, Wei, Wu, Yang, Ji, Shuaihua, Chen, Xi, Tan, Pingheng, Xue, Qi-Kun, Xu, Yong, Duan, Wenhui, Yu, Pu, and Zhou, Shuyun

Published
2022
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39. Dipeptidyl peptidase‐4 disturbs adipocyte differentiation via the negative regulation of the glucagon‐like peptide‐1/adiponectin‐cathepsin K axis in mice under chronic stress conditions

Author

Zhang, Meiping, primary, Yue, Xueling, additional, Xu, Shengnan, additional, Piao, Jinshun, additional, Zhao, Longguo, additional, Shu, Shangzhi, additional, Kuzuya, Masafumi, additional, Li, Ping, additional, Hong, Lan, additional, Kim, Weon, additional, Liu, Bin, additional, and Cheng, Xian Wu, additional

Published
2024
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46. A MIMO Channel Measurement System Based on Delay Lines and Simulations Based on Graph Modeling

Author

Xu, Shengnan, Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Gao, Honghao, editor, Fan, Pingyi, editor, Wun, Jun, editor, Xiaoping, Xue, editor, Yu, Jun, editor, and Wang, Yi, editor

Published
2021
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