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Your search keyword '"Wu,Desheng"' showing total 749 results
Start Over Author "Wu,Desheng" Publication Type Academic Journals
749 results on '"Wu,Desheng"'

37. Fermion-boson many-body interplay in a frustrated kagome paramagnet.

Author

Yin, J-X, Shumiya, Nana, Mardanya, Sougata, Wang, Qi, Zhang, Songtian S, Tien, Hung-Ju, Multer, Daniel, Jiang, Yuxiao, Cheng, Guangming, Yao, Nan, Wu, Shangfei, Wu, Desheng, Deng, Liangzi, Ye, Zhipeng, He, Rui, Chang, Guoqing, Liu, Zhonghao, Jiang, Kun, Wang, Ziqiang, Neupert, Titus, Agarwal, Amit, Chang, Tay-Rong, Chu, Ching-Wu, Lei, Hechang, and Hasan, M Zahid

Abstract

Kagome-nets, appearing in electronic, photonic and cold-atom systems, host frustrated fermionic and bosonic excitations. However, it is rare to find a system to study their fermion-boson many-body interplay. Here we use state-of-the-art scanning tunneling microscopy/spectroscopy to discover unusual electronic coupling to flat-band phonons in a layered kagome paramagnet, CoSn. We image the kagome structure with unprecedented atomic resolution and observe the striking bosonic mode interacting with dispersive kagome electrons near the Fermi surface. At this mode energy, the fermionic quasi-particle dispersion exhibits a pronounced renormalization, signaling a giant coupling to bosons. Through the self-energy analysis, first-principles calculation, and a lattice vibration model, we present evidence that this mode arises from the geometrically frustrated phonon flat-band, which is the lattice bosonic analog of the kagome electron flat-band. Our findings provide the first example of kagome bosonic mode (flat-band phonon) in electronic excitations and its strong interaction with fermionic degrees of freedom in kagome-net materials.

Published
2020

38. Field-free platform for Majorana-like zero mode in superconductors with a topological surface state

Author

Zhang, Songtian S, Yin, Jia-Xin, Dai, Guangyang, Zhao, Lingxiao, Chang, Tay-Rong, Shumiya, Nana, Jiang, Kun, Zheng, Hao, Bian, Guang, Multer, Daniel, Litskevich, Maksim, Chang, Guoqing, Belopolski, Ilya, Cochran, Tyler A, Wu, Xianxin, Wu, Desheng, Luo, Jianlin, Chen, Genfu, Lin, Hsin, Chou, Fang-Cheng, Wang, Xiancheng, Jin, Changqing, Sankar, Raman, Wang, Ziqiang, and Hasan, M Zahid

Subjects
cond-mat.supr-con, cond-mat.mes-hall, Physical Sciences, Chemical Sciences, Engineering, Fluids & Plasmas
Abstract

Superconducting materials exhibiting topological properties are emerging as an exciting platform to realize fundamentally new excitations from topological quantum states of matter. In this letter, we explore the possibility of a field-free platform for generating Majorana zero energy excitations by depositing magnetic Fe impurities on the surface of candidate topological superconductors, LiFeAs and PbTaSe2. We use scanning tunneling microscopy to probe localized states induced at the Fe adatoms on the atomic scale and at sub-Kelvin temperatures. We find that each Fe adatom generates a striking zero-energy bound state inside the superconducting gap, which do not split in magnetic fields up to 8 T, underlining a nontrivial topological origin. Our findings point to magnetic Fe adatoms evaporated on bulk superconductors with topological surface states for exploring Majorana zero modes and quantum information science under field-free conditions.

Published
2020

39. Financing the retailers with default probabilities: capital constrained supplier vs. bank.

Author

Qin, Jing, Dash Wu, Desheng, Qin, Kun, and Nie, Yaoxiang

Subjects
COUNTERPARTY risk, DEFAULT (Finance), WORKING capital, CREDIT ratings, SUPPLIERS, WHOLESALE prices, DIRECT costing, PROBABILITY theory
Abstract

In this paper, we examine a supply chain consisting of a supplier with capital constraint and multiple retailers with no working capital. The retailers can get either trade credit from the supplier or loan from banks. All the retailers are differentiated by their credit scores, which measure the possibility that they default. We show that when the retailer's default probability is high compared with the marginal cost, the retailer cannot get financial support. If the retailers only get money from banks, the more reliable a retailer is, the higher the wholesale price the supplier may charge him. We also find out that the supplier has the motivation to provide trade credit even when the retailers can get money from banks. And no matter where the retailers get money from, when the initial capital is a little insufficient, the supplier will reduce the quantity of the products provided to all retailers. As the initial capital becomes less, the supplier will cut off all the supply to the lowest-score retailer first no matter whether the supplier undertakes the default risk or not. In other words, when the retailers are heterogeneous, for supplier, it is not always the more retailers, the better. [ABSTRACT FROM AUTHOR]

Published
2023
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