['The', 'plane', 'wave', 'basis', 'set', 'is', 'truncated', 'at', 'a', 'cutoff', 'of', '400eV', ',', 'and', 'the', 'Brillouin', '-', 'zone', 'sampling', 'was', 'performed', 'using', 'the', 'Monkhorst', '-', 'Pack', 'scheme', 'with', 'a', 'k', '-', 'point', 'spacing', 'in', 'reciprocal', 'space', 'of', '0.04Å−1', '.']