Kane Fermion in a Two-Dimensional π‑Conjugated
Bis(iminothiolato)nickel Monolayer
Version 2 2018-01-22, 21:03
Version 1 2018-01-19, 22:31
Posted on 2018-01-22 - 21:03
Massless
Kane fermions revealed in zinc-blende semiconductors have
recently gained interest in the broad study of relativistic materials.
In particular, two-dimensional (2D) Kane fermions were expected to
be hybrids of pseudospin-1 and -1/2 Dirac fermions. Based on first-principles
calculations, we demonstrated that 2D Kane fermions can be realized
in a recently synthesized metal–organic framework, namely,
bis(iminothiolato)nickel monolayer. A slight compression takes the
system from a semimetal to a semiconductor. At the critical strain
of ∼1%, the upper and lower conical bands linearize and touch
at a single point intersecting a flat band, showing the same dispersion
as the pseudospin-1 Dirac–Weyl systems. We adopted a tight-binding
Hamiltonian of a line-centered honeycomb lattice to reveal the origins
and topology of the electronic band structure. The coexistence of
Kane-type and Dirac-type spectra in the bis(iminothiolato)nickel monolayer
is expected to benefit the study of multi quasiparticle effects.
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Wang, Aizhu; Zhao, Xinrui; Zhao, Mingwen; Zhang, Xiaoming; Feng, Yuanping; Liu, Feng (2018). Kane Fermion in a Two-Dimensional π‑Conjugated
Bis(iminothiolato)nickel Monolayer. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.7b03021
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AUTHORS (6)
AW
Aizhu Wang
XZ
Xinrui Zhao
MZ
Mingwen Zhao
XZ
Xiaoming Zhang
YF
Yuanping Feng
FL
Feng Liu