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5,845 results on '"Sun, Ya"'

154. Topological invariants for holographic semimetals

Author

Liu, Yan and Sun, Ya-Wen

Subjects
High Energy Physics - Theory, Condensed Matter - Strongly Correlated Electrons
Abstract

We study the behavior of fermion spectral functions for the holographic topological Weyl and nodal line semimetals. We calculate the topological invariants from the Green functions of both holographic semimetals using the topological Hamiltonian method, which calculates topological invariants of strongly interacting systems from an effective Hamiltonian system with the same topological structure. Nontrivial topological invariants for both systems have been obtained and the presence of nontrivial topological invariants further supports the topological nature of the holographic semimetals., Comment: 39 pages, 11 figures, 1 table; v2: match published version

Published
2018
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155. Topological nodal line semimetals in holography

Author

Liu, Yan and Sun, Ya-Wen

Subjects
High Energy Physics - Theory, Condensed Matter - Strongly Correlated Electrons
Abstract

We show a holographic model of a strongly coupled topological nodal line semimetal (NLSM) and find that the NLSM phase could go through a quantum phase transition to a topologically trivial state. The dual fermion spectral function shows that there are multiple Fermi surfaces each of which is a closed nodal loop in the NLSM phase. The topological structure in the bulk is induced by the IR interplay between the dual mass operator and the operator that deforms the topology of the Fermi surface. We propose a practical framework for building various strongly coupled topological semimetals in holography, which indicates that at strong coupling topologically nontrivial semimetal states generally exist., Comment: 21 pages, 5 figures; v2: match published version

Published
2018
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162. An Ethical Analysis of Native-Speaking English Teachers' Identity Construction in a Mainland China University

Author

Guo, Xiaoyan, Chen, Gong, and Sun, Ya

Abstract

Informed by Foucault's (1988) notion of ethics and the four axes of ethical self-formation (Clark 2009. 'The Ethico-politics of Teacher Identity'. "Educational Philosophy and Theory" 41 (2): 185-200), this study explores how native-speaking English teachers (NETs) constructed their identities in relation to their lived experiences and practices at a university in mainland China. A multiple case study approach was employed using interviews with focal participants and reflective journals to understand their teaching experiences and practices as well as their meaning-making processes. Findings from the four cases suggest that participants constructed multiple and changing identities composed of various language teaching beliefs and practices. Whilst participants were influenced by dominant discourses which challenged their legitimacy as university teachers, the way individual teachers understood their professional experiences and interpreted the sociocultural constraints also played a critical role. Teacher identity self-practices and technologies of self were found to be important for helping NETs to negotiate favourable identities and liberate themselves from impositions. The article concludes with implications for NETs, host community and policy makers.

Published
2021
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197. Development and Prediction Analysis of Drug Delivery System Platform Based on Web

Author

Sun, Ya, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Xu, Zheng, editor, Parizi, Reza M., editor, Loyola-González, Octavio, editor, and Zhang, Xiaolu, editor

Published
2021
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