BSE calculations

Elk Users
John S Tse
  • John S Tse

    John S Tse - 2012-04-10

    I would like to confirm in a BSE calculation interband transitions between different k points are not computed, i.e. no indirect transitions.  For example the indirect gap transition in Si is not computed.


  • John Kay Dewhurst

    Hi John,

    The BSE matrix has coupling between different k-points in order to allow for excitonic states. For the calculations of the the BSE dielectric function, only vertical transitions are allowed, i.e. using the dipole approximation.

    Hope that helps.



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