Artículo
Fate of pairing and spin-charge separation in the presence of long-range antiferromagnetism
Fecha de publicación:
05/2022
Editorial:
American Physical Society
Revista:
Physical Review B
ISSN:
2469-9950
e-ISSN:
2469-9969
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present a numerical study of competing orders in the 1D t-J model with long-range RKKY-like staggered spin interactions. By circumventing the constraints imposed by Mermin-Wagner's theorem, this Hamiltonian can realize long-range Néel order at half filling. We determine the full phase diagram as a function of the exchange and particle density using the density matrix renormalization group (DMRG) method. We show that pairing is disfavored and the AFM insulator and metallic phases are separated by a broad regime with phase segregation, before spin-charge separation re-emerges at low densities. Upon doping, interactions induce a confining potential that binds holons and spinons into full fledged fermionic quasiparticles in a range of parameters and densities. We numerically calculate the photoemission spectrum of the model, showing the appearance of a coherent quasiparticle band splitting away from the holon-spinon continuum with a width determined by J that survives at finite doping. Comparison with analytical results using the self-consistent Born approximation (SCBA) and by solving the spinon-holon problem offer insight into the internal structure of the quasiparticles and help us explain the different features in the spectrum. We discuss how this simple toy model can teach us about the phenomenology of its higher-dimensional counterpart.
Palabras clave:
STRONG CORRELATION
,
SPIN-CHARGE SEPARATION
,
tJ MODEL
,
SCBA
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Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Citación
Yang, Luhang; Hamad, Ignacio Javier; Manuel, Luis Oscar; Feiguin, Adrian E.; Fate of pairing and spin-charge separation in the presence of long-range antiferromagnetism; American Physical Society; Physical Review B; 105; 19; 5-2022; 1-16
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