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Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5Chen, Zhi Guo (author), Chen, R. Y. (author), Zhong, R. D. (author), Schneeloch, John (author), Zhang, C. (author), Huang, Y. (author), Qu, F. (author), Yu, R. (author), Li, Q. (author), Gu, G. D. (author), Wang, N. L. (author)Three-dimensional topological insulators (3D TIs) represent states of quantum matters in which surface states are protected by timereversal symmetry and an inversion occurs between bulk conduction and valence bands. However, the bulk-band inversion, which is intimately tied to the topologically nontrivial nature of 3D Tis, has rarely been...journal article 2017
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Qu, B. (author), Li, Q. (author), Havlin, S. (author), Stanley, E. (author), Wang, H. (author)Dynamic social opinion models have been widely studied on undirected networks, and most of them are based on spin interaction models that produce a consensus. In reality, however, many networks such as Twitter and the World Wide Web are directed and are composed of both unidirectional and bidirectional links. Moreover, from choosing a coffee...journal article 2014