  Recently, a new carbon-based two-dimensional (2D) material, so called "carbon
Ene-yne" (CEY), was successfully synthesized. In this work, we examine
electronic, optical and thermal properties of this novel material. We studied
the stretchability of CEY via density functional theory (DFT) calculations.
Using the PBE and HSE06 functionals, as well as the G$_0$W$_0$ method and the
Bethe-Salpeter equation, we systematically explored electronic and optical
properties of 2D CEY. In particular, we investigated the change of band-gap and
optical properties under uniaxial and biaxial strain. Ab-initio molecular
dynamics simulations confirm that CEY is stable at temperatures as high as 1500
K. Using non-equilibrium molecular dynamics simulations, the thermal
conductivity of CEY was predicted to be anisotropic and three orders of
magnitude smaller than that of graphene. We found that in the visible range,
the optical conductivity under high strain levels is larger than that of
graphene. This enhancement in optical conductivity may allow CEY to be used in
photovoltaic cells. Moreover, CEY shows anisotropic optical responses for x-
and y- polarized light, which may be suitable as an optical linear polarizer.
The comprehensive insight provided by the present investigation should serve as
a guide for possible applications of CEY in nanodevices.
