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SUMMARY:GdAlSi: A potential candidate for altermagnetic topological Weyl s
 emimetal
DTSTART:20241004T151500
DTSTAMP:20260511T083838Z
UID:7c71302f1ee50df673e27e776108c48f170a9768cce24c6b14bd5c99
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Aftab Alam Indian Institute of Technology Bombay\, India
 \nSpintronics has emerged as a viable alternative to conventional electron
 ics in the past few decades. On one hand\, discovery of topological phases
  of matter with protected spin-polarized states have shown promising appli
 cations while on the other hand\, new magnetic materials have shown intrig
 uing phases of collinear antiferromagnets with unconventional spin-splitte
 rs. In this work\, we report the co-existence of these two interesting pha
 ses in a single material: GdAlSi. GdAlSi crystallizes in a body-centered t
 etragonal structure with anon-centrosymmetric space group I41md (109)\, as
  confirmed by our XRD and optical second harmonic generation experiments. 
 The magnetization data indicates antiferromagnetic (AFM) ordering with an 
 ordering temperature (TN) 32 K. Ab-initio calculations show GdAlSi to be a
  collinear antiferromagnetic Weyl semimetal (WSM) with an unconventional m
 omentum-dependent spin splitting (also nomenclature as altermagnetism).Fer
 mi arcs\, a characteristic feature of WSMs\, have been subsequently observ
 ed in angle-resolved photoemission spectroscopy (ARPES) measurements perfo
 rmed on GdAlSi single crystals. Electric and magnetic multipole analysis g
 ives a deeper insight into the symmetry mediated momentum-dependent spin s
 plitting which has a strictly non-relativistic origin. To the best of our 
 knowledge\, such coexistence of unconventional AFM order and non-trivial t
 opology is unprecedented and has never been observed before in any materia
 l which makes GdAlSi a wonder material. Finally\, we propose a device whic
 h can leverage this unique coexistence leading to practical and efficient 
 topotronic application.
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503
STATUS:CONFIRMED
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