TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.14.1 TI - New Symmetry for Silicon JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 14 IS - SP - 1 EP - PY - 2004/07/02/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.14.1 A1 - Cho, Adrian ER -