Godby, R.W. and Schindlmayr, A. (1998) Systematic vertex corrections through iterative solution of Hedin's equations beyond the it GW approximation. Physical Review Letters. pp. 1702-1705. ISSN 1079-7114
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.
|Copyright, Publisher and Additional Information:||© 1998 American Physical Society. Published in Physical Review Letters and uploaded in accordance with the publisher's self archiving policy.|
|Institution:||The University of York|
|Academic Units:||The University of York > Physics (York)|
|Depositing User:||Physics Import|
|Date Deposited:||29 Sep 2008 09:55|
|Last Modified:||26 Mar 2015 07:36|