Spectral function of the U → ∞ one-dimensional Hubbard model at finite temperature and the crossover to the spin-incoherent regime
Feiguin, Adrian E.
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Citation (published version)Mohammad Soltanieh-ha, Adrian E Feiguin. "Spectral function of the U → ∞ one-dimensional Hubbard model at finite temperature and the crossover to the spin-incoherent regime." Physical Review B, Volume 90, Issue 16, https://doi.org/10.1103/physrevb.90.165145
The physics of the strongly interacting Hubbard chain (with t/U ≪ 1) at finite temperatures undergoes a crossover to a spin-incoherent regime when the temperature is very small relative to the Fermi energy, but larger than the characteristic spin energy scale. This crossover can be understood by means of Ogata and Shiba's factorized wave function, where charge and spin are totally decoupled, and assuming that the charge remains in the ground state, while the spin is thermally excited and at an effective “spin temperature.” We use the time-dependent density matrix renormalization group method to calculate the dynamical contributions of the spin, to reconstruct the single-particle spectral function of the electrons. The crossover is characterized by a redistribution of spectral weight both in frequency and momentum, with an apparent shift by kF of the minimum of the dispersion.
Rights© 2014 American Physical Society. The accepted manuscript version of this article appears in OpenBU by permission of the publisher.