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Impurity-induced Resonant States in Topological Nodal-line Semimetals by Zhou, Tao; Chen, Wei; Gao, Yi; Wang, Z. D. is a scholarly article available to read on EtoBox.

What is Impurity-induced Resonant States in Topological Nodal-line Semimetals about?

Nodal-line semimetals are characterized by a kind of topologically nontrivial bulk-band crossing, giving rise to almost flat surface states. Yet, a direct evidence of the surface states is still lacking. Here we study theoretically impurity effects in topological nodal-line semimetals based on the T-matrix method. It is found that for a bulk impurity, some in-gap states may be induced near the impurity site, while the visible resonant impurity state can only exist for certain strength of the impurity potentials. For a surface impurity, robust resonant impurity states exist in a wide range of impurity potentials. Such robust resonant states stem from the topological protected weak dispersive surface states, which can be probed by scanning tunneling microscopy, providing a strong signature of the topological surface states in the nodal-line semimetals.

Author

Zhou, Tao; Chen, Wei; Gao, Yi; Wang, Z. D.

Published

2019

Language

EN