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The structural and electronic properties  are investigated using the first-principles pseudopotential method as implemented in the ABINIT code. The Brillouin zones are sampled with a 10 ¡Á 1 ¡Á 8 Monkhorst-Pack k mesh. The cutoff energy for the plane-wave expansion is set to be 800 eV. For the structural relaxation, the exchange-correlation energy is in the form of Perdew-Burke-Ernzerhof (PBE) with generalized gradient approximation (GGA). Both the geometries and atomic positions are fully relaxed until the force acting on each atom is less than 0 .5 ¡Á 10−3eV/˚A. In the calculations of the electronic structures, the Tran-Blaha modified Becke-Johnson (TB-mBJ) potential [25 ]isused, which can reproduce accurate band gaps for many semi-conductors.
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The Brillouin zones are sampled with a 8 ¡Á 2¡Á 5 Monkhorst-Pack k mesh. The cutoff energy for the plane-wave expansion is set to be 180 eV. For the structural relaxation, the exchange-correlation energy is in the form of Perdew-Burke-Ernzerhof (PBE) with generalized gradient approximation (GGA). Both the geometries and atomic positions are fully relaxed until the force acting on each atom is less than 0.03eV/˚A.
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