Signature of antiferromagnetic long-range order in the optical spectrum of strongly correlated electron systems

Physical Review B - Condensed Matter and Materials Physics

Volumn 85, Issue 8, 2012, Pages

  Taranto, C ^a   Sangiovanni, G ^a   Held, K ^a   Capone, M ^b   Georges, A ^c,d,e   Toschi, A ^a  

^a VIENNA UNIVERSITY OF TECHNOLOGY   (Austria)

^b DEMOCRITOS NATIONAL SIMULATION CENTER   (Italy)

^c CENTRE DE PHYSIQUE THÉORIQUE   (France)

^d l'alimentation et l'Environnement   (France)

^e UNIVERSITY OF GENEVA   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84857748659     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.85.085124     Document Type: Article

References (46)

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45. For instance, at U = 5 D, the maximal magnetization (at T = 0) for the Hubbard model is m = 0.979, which correspond to the t - J solution at β D = 46.6. This slight difference in temperature is naturally reduced with increasing U.
46. In other words, this means that if the chemical potential were rigidly shifted to the value of the first (low-energy) AF magnetic peak, this would behave as a coherent quasiparticle excitation (though strongly renormalized by Z ∼ D 2 U). A similar situation would occur, mutatis mutandis, in the case such an excitation were activated by an external perturbation of frequency ω of the size of the spectral gap, e.g., by an electromagnetic field, when measuring the optical conductivity σ (ω).