1. (a) A ID crystal consists of N (N +) basis points separated by a lattice constant a. Sketch the energy band structure
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- 1 A A Id Crystal Consists Of N N Basis Points Separated By A Lattice Constant A Sketch The Energy Band Structure 1 (80.7 KiB) Viewed 25 times
innformation that was given. NFEM is the nearly free electron model
in case this causes any confusion
1. (a) A ID crystal consists of N (N +) basis points separated by a lattice constant a. Sketch the energy band structure of the nearly-free-electron model (NFEM) of the 1D crystal. (b) Based on your sketch, briefly describe classification of 1D conductor and insulator in terms of the valence electron number per crystal basis. Hence answer: i. Under high pressure, hydrogen molecules are connected to form molec- ular chains (1D crystal with two hydrogen atoms per basis). Is such a molecular chain a conductor or an insulator according to NFEM? ii. Under further increasing pressure, atomic hydrogen chains (1D crystal with one hydrogen atom per basis) were observed'. Is such a hydrogen chain a conductor or an insulator according to NFEM?