Quasiparticle and Spin Excitation Spectra in the Normal and d-Wave Superconducting State of the Two-Dimensional Hubbard Model

T. Dahm; L. Tewordt

doi:10.1103/PhysRevLett.74.793

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Quasiparticle and Spin Excitation Spectra in the Normal and d-Wave Superconducting State of the Two-Dimensional Hubbard Model

T. Dahm, L. Tewordt

DOI 10.1103/PhysRevLett.74.793 · Physical Review Letters

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Abstract

The quasiparticle and spin excitation spectra in the 2D Hubbard model are calculated self-consistently as functions of momentum on the real frequency axis. Near half filling we obtain in the normal state a pseudogap in the density of states. The pairing state has dx2−y2 symmetry. Below Tc, gaps open rapidly in the frequency spectra of the gap function, the quasiparticle scattering rate, and the density of states. The scattering rate and spin-lattice relaxation rate drop abruptly below Tc. Our results are consistent with experiments on La2−xSrxCuO4.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.86Sr0.14CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown