Anomalous transport responses, dictated by the nontrivial band topology, are the key for application of topological materials to advanced electronics and spintronics. One promising platform is topological nodal-line semimetals due to their rich topology and exotic physical properties. However, their transport signatures have often been masked by the complexity in band crossings or the coexisting topologically trivial states. Here we show that, in slightly hole-doped SrAs3, the single-loop nodal-line states are well-isolated from the trivial states and entirely determine the transport responses. The characteristic torus-shaped Fermi surface and the associated encircling Berry flux of nodal-line fermions are clearly manifested by quantum oscillations of the magnetotransport properties and the quantum interference effect resulting in the two-dimensional behaviors of weak antilocalization. These unique quantum transport signatures make the isolated nodal-line fermions in SrAs3 desirable for novel devices based on their topological charge and spin transport.
|Publication status||Published - 2022 Dec|
Bibliographical noteFunding Information:
The authors would like to thank H. W. Lee, H. W. Yeom, E. J. Choi, and M. Kang for fruitful discussions. We would also thank H. G. Kim at the Pohang Accelerator Laboratory (PAL) for the technical support. This work was supported by the Basic Science Research Program (No. 2021R1I1A1A01060209 and No. NRF-2022R1A2C3009731), BrainLink program (No. 2022H1D3A3A01077468), the Max Planck POSTECH/Korea Research Initiative (Grant No. 2022M3H4A1A04074153 and 2020M3H4A2084417), funded by the Ministry of Science and ICT through the National Research Foundation (NRF) of Korea. This work is also supported by the Institute for Basic Science (IBS) through the Center for Artificial Low Dimensional Electronic Systems (no. IBS-R014-D1) and by Samsung Advanced Institute of Technology (SAIT). S.C. and K.S.K. were supported by the NRF (Grants No. NRF-2021R1A3B1077156, NRF-2017R1A5A1014862, NRF-2020K1A3A7A09080364, NRF-RS-2022-00143178). W.K. acknowledges the support from NRF (Grants No. 2018R1D1A1B07050087 and 2018R1A6A1A03025340). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida.
© 2022, The Author(s).
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)