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Selected Works of Ehsan Khatami
Contribution to Book
Dynamical Cluster Approximation
Strongly Correlated Systems (2012)
  • H. Fotso, Louisiana State University
  • S. Yang, Louisiana State University
  • K. Chen, Louisiana State University
  • S. Pathak, Louisiana State University
  • J. Moreno, Louisiana State University
  • M. Jarrell, Louisiana State University
  • K. Mikelsons, Georgetown University
  • Ehsan Khatami, Georgetown University
  • D. Galanakis, Nanyang Technological University, Singapore
Link
Abstract
The dynamical cluster approximation (DCA) is a method which systematically incorporates nonlocal corrections to the dynamical mean-field approximation. Here we present a pedagogical discussion of the DCA by describing it as a Φ-derivable coarse-graining approximation in k-space, which maps an infinite lattice problem onto a periodic finite-sized cluster embedded in a self-consistently determined effective medium. We demonstrate the method by applying it to the two-dimensional Hubbard model. From this application, we show evidences of the presence of a quantum critical point (QCP) at a finite doping underneath the superconducting dome. The QCP is associated with the second-order terminus of a line of first order phase separation transitions. This critical point is driven to zero temperature by varying the band parameters, generating the QCP. The effect of the proximity of the QCP to the superconducting dome is also discussed.
Disciplines
Publication Date
2012
Editor
Adolfo Avella and Ferdinando Mancini
Publisher
Springer
Series
Springer Series in Solid-State Sciences
ISBN
978-3-642-21831-6
DOI
10.1007/978-3-642-21831-6_9
Citation Information
H. Fotso, S. Yang, K. Chen, S. Pathak, et al.. "Dynamical Cluster Approximation" BerlinStrongly Correlated Systems (2012) p. 271 - 302
Available at: http://works.bepress.com/ehsan_khatami/34/