Report
GdAlSi: An antiferromagnetic topological Weyl semimetal with non-relativistic spin splitting
| العنوان: | GdAlSi: An antiferromagnetic topological Weyl semimetal with non-relativistic spin splitting |
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| المؤلفون: | Nag, Jadupati, Das, Bishal, Bhowal, Sayantika, Nishioka, Yukimi, Bandyopadhyay, Barnabha, Sarker, Saugata, Kumar, Shiv, Kuroda, Kenta, Gopalan, Venkatraman, Kimura, Akio, Suresh, K. G., Alam, Aftab |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science, Condensed Matter - Other Condensed Matter |
| الوصف: | Spintronics has emerged as a viable alternative to traditional electronics based technologies in the past few decades. While on one hand, the discovery of topological phases of matter with protected spin-polarized states has opened up exciting prospects, recent revelation of intriguing non-relativistic spin splitting in collinear antiferromagnetic materials with unique symmetries facilitate a wide possibility of realizing both these features simultaneously. In this work, we report the co-existence of these two intriguing properties within a single material: GdAlSi. It crystallizes in a body-centered tetragonal structure with a non-centrosymmetric space group $I4_{1}md$ ($109$), which is confirmed using detailed structural analysis through X-ray diffraction (XRD) and optical second harmonic generation (SHG) measurements. The magnetization data indicates AFM ordering with an ordering temperature ($T_N$) $\sim$ 32 K. Ab-initio calculations reveal GdAlSi to be a collinear antiferromagnetic Weyl semimetal with an unconventional, momentum-dependent spin splitting, also referred to as altermagnet. Angle-resolved photoemission spectroscopy measurements on GdAlSi single crystals subsequently confirm the presence of Fermi arcs, a distinctive hallmark of Weyl semimetals. Electric and magnetic multipole analysis provides a deeper understanding of the symmetry-mediated, momentum-dependent spin splitting, which has strictly non-relativistic origin. To the best of our knowledge, such co-existence of unconventional antiferromagnetic order and non-trivial topology is unprecedented and has never been observed before in a single material, rendering GdAlSi a special and promising candidate material. We propose a device harnessing these features, poised to enable practical and efficient topotronic applications. Comment: 24 pages (14 pages main, 10 pages supplement), 15 figures (7 figures main, 8 figures supplement) |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2312.11980 |
| رقم الانضمام: | edsarx.2312.11980 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |