Exotic phenomena in topological Weyl line magnets
ORAL
Abstract
Topological electronic phases in intrinsic magnets are of current interest. One common magnetic topological object is the Weyl line, a two-fold band degeneracy along a closed curve in bulk momentum space. Weyl lines arise naturally in the absence of time-reversal symmetry (absent in magnets) and in the presence of mirror symmetry (common in many space groups). I will present the observation of Weyl lines by ARPES in the room temperature magnet Co2MnGa [1]. On the surface of the magnet, I observe drumhead surface states, pinpointing the bulk-boundary correspondence and suggesting a Berry phase topological invariant associated with the Weyl line. Next, the intrinsic Berry curvature contribution to the anomalous Hall response, determined from quantum transport, agrees with a prediction of the Weyl line Berry curvature based on ARPES and first-principles calculations [1]. I will comment on composite topological structures arising from pinning and linking of different Weyl lines. Lastly, I will discuss future directions in Co2MnGa and other topological Weyl line magnets.
[1] I. Belopolski*, K. Manna*, D. S. Sanchez*, G. Chang* et al. Science 365, 1278 (2019).
[1] I. Belopolski*, K. Manna*, D. S. Sanchez*, G. Chang* et al. Science 365, 1278 (2019).
*Work at Princeton was supported by the US DOE under the Basic Energy Sciences programme (Grant #: DOE/BES DE-FG-02-05ER46200).
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Presenters
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Ilya Belopolski
- Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
- Princeton University