2025/07/15 by Saurabh Kumar Sen, Sen, Saurabh Kumar, Shivendra Kumar Gupta +6
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Intermetallics and Advanced Alloy Properties #Materials Science (cond-mat.mtrl-sci) #Metallurgical and Alloy Processes #Rare-earth and actinide compounds
paper · pdf · doi:10.48550/arxiv.2507.11705
openalex publication_date 2025/07/15 · openalex created_date 2025/10/14 · openalex updated_date 2026/07/28
The plethora of multifold quasiparticles in topological materials has led to significant advancements in condensed matter physics, inspiring the investigation for materials that host both electronic and bosonic multifold excitations. In this work, we explore the electronic and phononic properties of TaSi, a non symmorphic chiral topological material crystallizing in space group P 2 1 3 (No. 198). This system exhibits multifold fermions, which are higher spin generalizations of Weyl fermions, protected by the unique crystalline symmetries of the structure. Using first principles calculations, we predict that electronic band possesses fourfold spin 3/2 Rarita Schwinger (RSW) fermions, sixfold excitations (double spin 1), all possessing large Chern numbers C = +4 and Weyl fermions of spin 1/2 with Chern no. -1 in the presence of spin orbit coupling (SOC). Additionally, the phononic band structure hosts chiral bosonic excitations characterized by Chern numbers C = +-2. The coexistence of chiral electronic and bosonic quasiparticles give rise to exotic transport phenomena, rendering the material as promising candidate for future applications in quantum materials, topological electronics, and spintronics.