Topological Dirac-Nodal-Line Semimetal Phase in High-Temperature Superconductor MgB<sub>2</sub>
ORAL
Abstract
Significant research effort has been devoted to searching for materials that host both superconducting and topological state, known as topological superconductor. Unfortunately, all the known topological superconductors to date have a very low transition temperature, which severely limits experimental measurement of Majorana fermions. We discover the existence of a topological Dirac-nodal-line (DNL) state in MgB2 which has the highest transition temperature (~40 K) for a conventional BCS superconductor using first-principles calculations. The DNL structure in MgB2 exhibits unique one-dimensional dispersive DNL, which connects the electron and hole Dirac states. Since the experimental samples and superconductivity measurement of MgB2 is well established, confirmation of our theoretical prediction is highly feasible.
*This work is supported by DOE-BES under Grant No DE-FG02-04ER46148.
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Presenters
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Kyung-Hwan Jin
- Univ of Utah
- University of Utah
- Department of Materials Science and Engineering, Univ of Utah