Twist-gram-boundary structure in the B4 phase of a bent-core molecular system identified by second harmonic generation circular dichroism measurement

Fumito Araoka, N. Y. Ha, Yoshitaka Kinoshita, Byougchoo Park, J. W. Wu, Hideo Takezoe

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Abstract

Second harmonic generation circular dichroism (SHG CD) measurements are performed on the B4 phase of a bent-core molecular system. Numerical analysis of SHG CD incorporating magnetic-dipole as well as electric-dipole interaction shows that the B4 phase is in a twist-grain-boundary structure with the helical axis along the bent direction of the molecules. The result is extremely important in the sense that achiral molecules are spontaneously optically resolved, i.e., deracemization, the chiral domains of which give rise to huge chiral nonlinear optical effect.

Original languageEnglish
Article number137801
JournalPhysical Review Letters
Volume94
Issue number13
DOIs
StatePublished - 8 Apr 2005

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