Frenkel-Kontorowa Model with Deformable Substrate:Ground State and Excitation Spectrum

概要

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A self-consistent model of two interpenetrating deformable chains is proposedto exactly calculate the ground state and the excitation spectrum in the con-tinuum limit. Transformation from incommensurate state to commensurate statecontinuously occurs for the out-of-phase coordinate ( W), implying that thetransformation simultaneously occurs on both chains, where deformabilitymakes the transforntation easier. The in-phase- coordinate ( 0), however, is rigid.The excitation spectrum consists of two independent modes, obtained as theinteracting modes between W and Q tlu"ough the kinetic coupling. These modeshave their own gaps at the inverse kink length. For no kinetic coupling, Q pos-sesses no gap, though W still maintains the gap.
社団法人日本物理学会の論文
1983-01-15