Systematic vertex corrections through iterative solution of Hedin's equations beyond the it GW approximation

R.W. Godby, A. Schindlmayr

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We present a general procedure for obtaining progressively more accurate functional expressions for the electron self-energy by iterative solution of Hedin's coupled equations. The iterative process starting from Hartree theory, which gives rise to the GW approximation, is continued further, and an explicit formula for the vertex function from the second full cycle is given. Calculated excitation energies for a Hubbard Hamiltonian demonstrate the convergence of the iterative process and provide further strong justification for the GW approximation.
Original languageEnglish
Pages (from-to)1702-1705
Number of pages3
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 23 Jan 1998

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© 1998 American Physical Society. Published in Physical Review Letters and uploaded in accordance with the publisher's self archiving policy.

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