Observation of topological surface state in a superconducting material
ORAL
Abstract
The discovery of the topological insulator phase has ignited massive research interests in novel quantum materials. Topological materials with superconductivity further invigorate the importance of materials providing the platform to study the interplay between these two unique states. However, the candidates of such materials are rare. Here, we report a systematic angle-resolved photoemission spectroscopy (ARPES) study of superconducting material CaBi2 [ Tc = 2 K], corroborated by the first-principles calculations. Our study reveals the presence of topological Dirac state at the corner-point of the Brillouin zone with topological protection. Furthermore, our transport measurements show the presence of large magnetoresistance in this compound. Our results provide a platform to study the superconductivity and topology in CaBi2.
*This project is supported by the Air Force Office of Scientific Research under Award No. FA9550-17-1-0415.
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Presenters
Gyanendra Dhakal
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
Authors
Gyanendra Dhakal
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
Md Mofazzel Hosen
Univ of Central Florida
University of Central Florida
Ayana Ghosh
Univ of Connecticut - Storrs
Materials Science and Engineering, University of Connecticut
University of Connecticut
Christopher Lane
Northeastern University
Physics, Northeastern University
Los Alamos National Laboratory
Karolina Górnicka
Faculty of Applied Physics and Mathematics, Gdansk University of Technology
Gdansk University of Technology
Michal J. Winiarski
Applied Physics and Mathematics, Gdansk University of Technology
Gdansk University of Technology
Johns Hopkins University
Klauss Dimitri
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
Firoza Kabir
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
Christopher Sims
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
Sabin Regmi
Univ of Central Florida
Physics, University of Central Florida
University of Central Florida
William Neff
Univ of Central Florida
University of Central Florida
Dariusz Kaczorowski
Institute of Low Temperature and Structure Research, Polish Academy of Sciences
Polish Academy of Sciences
Jian-Xin Zhu
Los Alamos National Laboratory
Los Alamos National Lab
Los Alamos Natl Lab
Theoretical Division, Los Alamos National Laboratory
Tomasz Klimczuk
Applied Physics and Mathematics, Gdansk University of Technology
Faculty of Applied Physics and Mathematics, Gdansk University of Technology
