Mesh Cutoff Energy & Fermi Energy in CNTs

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hi
what is concept of mesh cutoff energy?
what is concept of Fermi energy in semiconductor and metallic CNTs?
 
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Asking the meaning of some parameter of some atomic computational toolkit without mentioning the name of the software won't help anyone understand what is the problem?

The concept of Fermi energy is universal and does not alter in case of semiconducting or metallic CNTs. For more insight read Fermi-Dirac Statistics.
 

Thread 'Instantaneous dipole moment and orbitals'

Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
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