Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W57: Topological, magnetoresistance and multiferroicity
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 303
Sponsoring
Unit:
GMAG
Chair: Qiang Zhang, Oak Ridge National Lab
Abstract: W57.00001 : Eu2Cd2As2 as a candidate Weyl Hydrogen Atom*
3:00 PM–3:36 PM
Presenter:
Keith M Taddei
(Oak Ridge National Laboratory)
Author:
Keith M Taddei
(Oak Ridge National Laboratory)
In its simplest realization, a Weyl Fermion can be created in a material with only a single fourfold degenerate linear band crossing (i.e. a Dirac point) at the Fermi energy that then undergoes time reversal symmetry breaking. This splits the Dirac point into two opposite chirality Weyl points which are intrinsically protected by their chirality and separation in momentum space. Such a configuration, dubbed the Weyl ‘Hydrogen Atom’, gives not only the most direct comparison with toy models but should also exhibit the clearest signatures of the associated topological physics. Here we present the results of neutron scattering, transport, magnetization, and first principles studies which strongly suggest that ferromagnetic EuCd2As2 may be just such a Weyl ‘Hydrogen Atom’. To solve the magnetic structure, we performed neutron scattering using isotopic Eu and Cd which revealed a previously unexpected, canted structure. Using this magnetic symmetry for band structure calculations we found only a single pair of Weyl points near the Fermi energy. Angle and field dependent transport measurements evidenced the existance of the Chiral anomaly supporting the predictions of the first principles calculations. Together these results suggest EuCd2As2 as a rare example of a Weyl Hydrogen Atom.
* L. Yin, L. D. Sanjeewa, Y. Li, J. Xing, C. dela Cruz, D. Phelan, A. S. Sefat, and D. S. ParkerThis work was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences (BES), U.S. Department of Energy (DOE).
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