Is it possible to obtain a finite system with three different regions using a discretize continuum Hamiltonian approach? I am using the fill command but I have issues obtaining a finite system, my idea is to have a finite system and fill each part of the system with different Hamiltonian talking about those three regions. I would appreciate if you have 
any idea to make it, thank in advance

Best regards,
Dr. Jorge Huamaní Correa
Professor at Universidad Tecnológica del Perú

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