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Rarita-Schwinger-Weyl semimetal in Jeff=3/2 electron systems
We propose a relativistic Jeff=3/2 semimetal with 4d1 or 5d1 electrons on a
cubic lattice when the strong spin-orbital coupling takes over the Hunds'
coupling. A relativistic spinor with spin 3/2 is historically called
Rarita-Schwinger spinor. In the massless case, the right- and left-handed
chiral degrees of freedom of the Rarita-Schwinger spinors are independent. In
the lattice model that we propose, the right- and left- handed gapless points
in Brillouin zone are separated. We call this linearly dispersed semimetal
Rarita-Schwinger-Weyl semimetal, similar to Weyl semimetal for spin 1/2
systems. There is a network of gapless Fermi arcs in the surface Brillouin zone
if n1+n2+n3 is even for the normal vector (n1,n2,n3) of the surface while the
surface is insulator if n1+n2+n3 is odd.Comment: 5 pages, 4 figure
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