TY - JOUR
T1 - Quantum Monte Carlo study of a bilayer U(2)×U(2) -symmetric Hubbard model
AU - Caplan, Yosef
AU - Orgad, Dror
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/10/15
Y1 - 2023/10/15
N2 - We carry out a sign-problem-free quantum Monte Carlo calculation of a bilayer model with a repulsive intralayer Hubbard interaction and a ferromagnetic interlayer interaction. The latter breaks the global SU(2) spin rotational symmetry but preserves a U(2)×U(2) invariance under mixing of same-spin electrons between layers. We show that despite the difference in symmetry, the bilayer model exhibits the same qualitative features found in the single-layer Hubbard model. These include stripe phases, whose nature is sensitive to the presence of next-nearest-neighbor hopping, a maximum in the Knight shift that moves to lower temperatures with increasing hole doping, and lack of evidence for intralayer d-wave superconductivity. Instead, we find a superconducting phase, coexisting with stripes, whose critical temperature traces a dome as a function of doping and is due to interlayer spin-polarized pairing that is induced by the ferromagnetic interaction.
AB - We carry out a sign-problem-free quantum Monte Carlo calculation of a bilayer model with a repulsive intralayer Hubbard interaction and a ferromagnetic interlayer interaction. The latter breaks the global SU(2) spin rotational symmetry but preserves a U(2)×U(2) invariance under mixing of same-spin electrons between layers. We show that despite the difference in symmetry, the bilayer model exhibits the same qualitative features found in the single-layer Hubbard model. These include stripe phases, whose nature is sensitive to the presence of next-nearest-neighbor hopping, a maximum in the Knight shift that moves to lower temperatures with increasing hole doping, and lack of evidence for intralayer d-wave superconductivity. Instead, we find a superconducting phase, coexisting with stripes, whose critical temperature traces a dome as a function of doping and is due to interlayer spin-polarized pairing that is induced by the ferromagnetic interaction.
UR - http://www.scopus.com/inward/record.url?scp=85177613365&partnerID=8YFLogxK
U2 - 10.1103/physrevb.108.165131
DO - 10.1103/physrevb.108.165131
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AN - SCOPUS:85177613365
SN - 2469-9950
VL - 108
JO - Physical Review B
JF - Physical Review B
IS - 16
M1 - 165131
ER -