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May 20-21, 2019 | Vienna, Austria
Biomaterials and Nanomaterials &
Materials Physics and Materials Science
2
nd
International Conference on
Journal of Materials Science and Nanotechnology | Volume 3
Discovery of dirac node lines in pure metals of beryllium and magnesium and their
potential applications
Chen Xing Qiu
Shenyang National Laboratory for Materials Science, China
B
eryllium is a simple alkali earth metal but has been
the target of intensive studies for decades because
of its unusual electron behaviors at surfaces. Puzzling
aspects include severe deviations from the description
of the nearly free electron picture, anomalously large
electron-phonon coupling effect, and giant Friedal
oscillations. The underlying origins for such anomalous
surface electron behaviors have been under active debate,
but with no consensus. Here, by means of first-principle
calculations, we discover that this pure metal system,
surprisingly, harbors the Dirac node line (DNL) that in
turn helps to rationalize many of the existing puzzles.
The DNL is featured by a closed line consisting of linear
band crossings and its induced topological surface band
agrees well with previous photoemission spectroscopy
observation on Be (0001) surface. We further reveal that
each of the elemental alkali earth metals of Mg, Ca, and
Sr also harbors the DNL, and speculate that the fascinating
topological property of DNL might naturally exist in other
elemental metals as well.
e
:
xingqiu.chen@imr.ac.cn