Stripes and the Emergence of Charge π-phase Shifts in Isotropically Paired Systems
arxiv(2024)
摘要
The interplay of spin and motional degrees of freedom forms a key element in
explaining stripe formation accompanied by sublattice reversal of local
antiferromagnetic ordering in interacting fermionic models. A long-standing
question aims to relate pairing to stripe formation, intending to discern the
applicability of simple models that observe this phenomenon in understanding
cuprate physics. By departing from fermionic statistics, we show that the
formation of stripes is rather generic, allowing one to unveil its competition
with superfluid behavior. To that end, we use a combination of numerical
methods to solve a model of interacting hardcore bosons in ladder geometries,
finding that once stripes are formed, either via external pinning or
spontaneously, a sublattice reversal (π-phase shift) of charge
ordering occurs, suppressing the superfluid weight. Lastly, we show that when
the Cooper pairs are not local, as in the attractive Hubbard model with finite
interactions, auxiliary-field quantum Monte Carlo calculations show evidence of
fluctuating stripes, but these are seen to coexist with superfluidity. Our
results corroborate the picture that static stripes cannot be reconciled with
pairing, unlike the case of fluctuating ones.
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