Semimetal with both Rarita-Schwinger-Weyl and Weyl excitations - INSPIRE

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Semimetal with both Rarita-Schwinger-Weyl and Weyl excitations

Long Liang
(
- Fudan U. and
- Aalto U.
)
,
Yue Yu
(
- Fudan U. and
- Beijing, Inst. Theor. Phys.
)

Dec 23, 2015

6 pages

Published in:

Phys.Rev.B 93 (2016) 4, 045113

Published: Jan 12, 2016

e-Print:

1512.07460 [cond-mat.mes-hall]

DOI:

10.1103/PhysRevB.93.045113

View in:

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Abstract: (APS)

A relativistic spinor with spin 3/2 is historically called a Rarita-Schwinger spinor. The right- and left-handed chiral degrees of freedom for the massless Rarita-Schwinger spinor are independent and are thought of as the left and right Weyl fermions with helicity ±3/2. We study three orbital spin-1/2 Weyl semimetals in the strong spin-orbital coupling limit with time reversal symmetry breaking. We find that in this limit the systems can be a Jeff=1/2 Weyl semimetal or a Jeff=3/2 semimetal, depending on the Fermi level position. The latter near Weyl points includes degrees of freedom of both Rarita-Schwinger-Weyl and Weyl. A nonlocal potential separates the Weyl and Rarita-Schwinger-Weyl degrees of freedom, and a relativistic Rarita-Schwinger-Weyl semimetal emerges. This recipe can be generalized to a mulit-Weyl semimetal and Weyl fermions with pairing interaction to obtain high monopole charges. Similarly, a spatial-inversion-breaking Raita-Schwinger-Weyl semimetal may also emerge.

Note:

7 pages. 2 figures. This paper supersedes arXiv:1506.05359

References(38)

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