Document Type
Article
Publication Date
April 2013
Publication Title
Physical Review B
Volume
87
Issue Number
16
DOI
10.1103/PhysRevB.87.161120
Keywords
Electronic, Spectral, Infinite, Dimensional, Hubbard
Disciplines
Astrophysics and Astronomy | Physical Sciences and Mathematics | Physics
Abstract
A strong-coupling series expansion for the Green's function and the extremely correlated Fermi liquid (ECFL) theory are used to calculate the moments of the electronic spectral functions of the infinite-U Hubbard model. Results from these two complementary methods agree very well at both low densities, where the ECFL solution is the most accurate, and at high to intermediate temperatures, where the series converge. We find that a modified first moment, which underestimates the contributions from the occupied states and is accessible in the series through the time-dependent Green's function, best describes the peak location of the spectral function in the strongly correlated regime. This is examined by the ECFL results at low temperatures, where it is shown that the spectral function is largely skewed towards the occupied states.
Recommended Citation
Ehsan Khatami, Daniel Hansen, Edward Perepelitsky, Marcos Rigol, and Sriram Shastry. "Electronic spectral properties of the two-dimensional infinite-U Hubbard model" Physical Review B (2013). https://doi.org/10.1103/PhysRevB.87.161120
Comments
This article originally appeared in Physical Review B, volume 87, issue 16, 2013, published by the American Physical Society. ©2013 American Physical Society. The article can also be found online at this link.
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