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cond-mat.str-el2018
Multi-valuedness of the Luttinger-Ward functional in the Fermionic and Bosonic System with Replicas
Aaram J. Kim, Vincent Sacksteder
We study the properties of the Luttinger-Ward functional (LWF) in a simplified Hubbard-type model without time or spatial dimensions, but with identical replicas located on a s…
cond-mat.str-el2018
Extended crossover from Fermi liquid to quasi-antiferromagnet in the half-filled 2D Hubbard model
Fedor Šimkovic, J. P. F. LeBlanc, Aaram J. Kim +4
The ground state of the Hubbard model with nearest-neighbor hopping on the square lattice at half filling is known to be that of an antiferromagnetic (AFM) band insulator for any o…
cond-mat.str-el2018
Spin freezing and the Sachdev-Ye model
Philipp Werner, Aaram Kim, Shintaro Hoshino
Spin-freezing is the origin of bad-metal physics and non-Fermi liquid (non-FL) properties in a broad range of correlated compounds. In a multi-orbital lattice system with Hund coup…